Helpers for using SQL views with Ecto
Initial release of EctoView
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.formatter.exs
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.formatter.exs
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.gitignore
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.gitignore
···
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# SPDX-FileCopyrightText: 2026 Łukasz Niemier <~@hauleth.dev>
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#
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# SPDX-License-Identifier: Apache-2.0
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# The directory Mix will write compiled artifacts to.
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/_build/
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# If you run "mix test --cover", coverage assets end up here.
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/cover/
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# The directory Mix downloads your dependencies sources to.
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/deps/
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# Where third-party dependencies like ExDoc output generated docs.
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/doc/
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# Ignore .fetch files in case you like to edit your project deps locally.
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/.fetch
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# If the VM crashes, it generates a dump, let's ignore it too.
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erl_crash.dump
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# Also ignore archive artifacts (built via "mix archive.build").
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*.ez
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# Ignore package tarball (built via "mix hex.build").
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ecto_view-*.tar
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# Temporary files, for example, from tests.
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/tmp/
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LICENSES/Apache-2.0.txt
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LICENSES/Apache-2.0.txt
···
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Apache License
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Version 2.0, January 2004
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http://www.apache.org/licenses/
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TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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"License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document.
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"Work" shall mean the work of authorship, whether in Source or Object form, made available under the License, as indicated by a copyright notice that is included in or attached to the work (an example is provided in the Appendix below).
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You may add Your own copyright statement to Your modifications and may provide additional or different license terms and conditions for use, reproduction, or distribution of Your modifications, or for any such Derivative Works as a whole, provided Your use, reproduction, and distribution of the Work otherwise complies with the conditions stated in this License.
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5. Submission of Contributions. Unless You explicitly state otherwise, any Contribution intentionally submitted for inclusion in the Work by You to the Licensor shall be under the terms and conditions of this License, without any additional terms or conditions. Notwithstanding the above, nothing herein shall supersede or modify the terms of any separate license agreement you may have executed with Licensor regarding such Contributions.
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8. Limitation of Liability. In no event and under no legal theory, whether in tort (including negligence), contract, or otherwise, unless required by applicable law (such as deliberate and grossly negligent acts) or agreed to in writing, shall any Contributor be liable to You for damages, including any direct, indirect, special, incidental, or consequential damages of any character arising as a result of this License or out of the use or inability to use the Work (including but not limited to damages for loss of goodwill, work stoppage, computer failure or malfunction, or any and all other commercial damages or losses), even if such Contributor has been advised of the possibility of such damages.
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9. Accepting Warranty or Additional Liability. While redistributing the Work or Derivative Works thereof, You may choose to offer, and charge a fee for, acceptance of support, warranty, indemnity, or other liability obligations and/or rights consistent with this License. However, in accepting such obligations, You may act only on Your own behalf and on Your sole responsibility, not on behalf of any other Contributor, and only if You agree to indemnify, defend, and hold each Contributor harmless for any liability incurred by, or claims asserted against, such Contributor by reason of your accepting any such warranty or additional liability.
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END OF TERMS AND CONDITIONS
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APPENDIX: How to apply the Apache License to your work.
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To apply the Apache License to your work, attach the following boilerplate notice, with the fields enclosed by brackets "[]" replaced with your own identifying information. (Don't include the brackets!) The text should be enclosed in the appropriate comment syntax for the file format. We also recommend that a file or class name and description of purpose be included on the same "printed page" as the copyright notice for easier identification within third-party archives.
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Copyright [yyyy] [name of copyright owner]
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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README.md
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README.md
···
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<!--
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SPDX-FileCopyrightText: 2026 Łukasz Niemier <~@hauleth.dev>
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SPDX-License-Identifier: Apache-2.0
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-->
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# EctoView
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Helper functions for creating database views using `Ecto.Query` helpers.
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## Installation
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Add `ecto_view` to your list of dependencies in `mix.exs`:
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```elixir
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def deps do
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[
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{:ecto_view, "~> 1.0"}
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]
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end
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```
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## Usage
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```elixir
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defmodule MyApplication.Repo.Migration.CreateViewFoo do
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use Ecto.Migration
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use EctoView.Migration # This line **MUST** be after `use Ecto.Migration`
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def change do
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query = from foo in "foos", # This **MUST** select from table name, no schemas allowed
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where: foo.bar == 2137,
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select: %{ # This **MUST** be a map of selected fields
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a: foo.a,
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b: foo.b
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}
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create view("foos_view", query)
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end
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end
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```
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If you want, you can also create materialised view using `materialized_view/2`
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function.
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If you create materialised view, then you can use `EctoView.refresh_materialized_view/3`
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function to refresh content of given view. If you will add:
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```elixir
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defmodule MyApplication.Repo do
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use Ecto.Repo, …
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use EctoView
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# …
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end
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```
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Then there will be a helper function `Repo.refresh_materialised_view/2` that
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will call respective function for that repo.
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The docs can be found at [https://hexdocs.pm/ecto_view](https://hexdocs.pm/ecto_view).
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+16
config/config.exs
+16
config/config.exs
···
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# SPDX-FileCopyrightText: 2026 Łukasz Niemier <~@hauleth.dev>
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#
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# SPDX-License-Identifier: Apache-2.0
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import Config
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config :ecto_view, ecto_repos: [EctoView.Repo]
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config :ecto_view, EctoView.Repo,
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username: System.get_env("POSTGRES_USER", "postgres"),
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password: System.get_env("POSTGRES_PASSWORD", "postgres"),
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database: System.get_env("POSTGRES_DB", "ecto_view"),
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hostname: "postgres",
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socket_dir: System.get_env("PGHOST"),
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show_sensitive_data_on_connection_error: true,
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pool_size: 10
+41
lib/ecto_view.ex
+41
lib/ecto_view.ex
···
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# SPDX-FileCopyrightText: 2026 Łukasz Niemier <~@hauleth.dev>
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#
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# SPDX-License-Identifier: Apache-2.0
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defmodule EctoView do
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@moduledoc """
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Helper functions for refreshing materialised views
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"""
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defmacro __using__([]) do
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quote do
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@behaviour unquote(__MODULE__)
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@impl unquote(__MODULE__)
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def refresh_materialized_view(queryable, opts \\ []) do
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unquote(__MODULE__).refresh_materialized_view(__MODULE__, queryable)
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end
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end
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end
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@doc """
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Refresh materialised view
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"""
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@callback refresh_materialized_view(table :: Ecto.Queryable.t()) ::
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:ok | {:error, term()}
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+
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## Implementation functions
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@doc """
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Refresh materialised view for given `queryable`.
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"""
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def refresh_materialized_view(repo, queryable, opts \\ []) do
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# This way we ensure that `schema` is properly escaped
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schema = schema_for_query(Ecto.Queryable.to_query(queryable))
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repo.query("REFRESH MATERIALIZED VIEW \"#{schema}\"", opts)
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end
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defp schema_for_query(%Ecto.Query{from: %Ecto.Query.FromExpr{source: {schema, _}}}) do
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schema
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end
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end
+145
lib/ecto_view/migration.ex
+145
lib/ecto_view/migration.ex
···
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defmodule EctoView.Migration do
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@moduledoc """
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"""
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defmodule View do
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@moduledoc false
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defstruct [:name, :query, materialized?: false]
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end
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+
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defmodule InvalidSource do
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defexception [:schema]
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+
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@impl true
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def message(%__MODULE__{schema: schema}) do
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"You cannot query the schema module (#{inspect(schema)}) in migration, as it can fail in future. Use schema name as binary instead"
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end
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end
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+
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defmodule InvalidSelect do
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defexception [:ast]
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+
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@impl true
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def message(%__MODULE__{ast: ast}) do
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"Selected values must be a map, got #{Macro.to_string(ast)}"
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end
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end
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+
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defmodule MissingQuery do
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defexception message: "Query is required for creating view"
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end
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+
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@doc false
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defmacro __using__(_opts) do
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create_mod =
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case Macro.Env.lookup_import(__ENV__, {:create, 1}) do
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[{_, mod}] -> mod
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[] -> raise "Ecto.Migration is not imported"
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+
end
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+
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quote do
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import unquote(create_mod), except: [create: 1, drop: 1, drop_if_exists: 1]
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import unquote(__MODULE__)
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+
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def create(%unquote(View){} = view), do: unquote(__MODULE__).__create_view__(view, false)
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def create(other), do: unquote(create_mod).create(other)
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+
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def create_or_replace(%unquote(View){} = view), do: unquote(__MODULE__).__create_view__(view, true)
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+
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def drop(%View{} = view), do: unquote(__MODULE__).__drop__(view, false)
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def drop(other), do: unquote(create_mod).drop(other)
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+
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def drop_if_exists(%View{} = view), do: unquote(__MODULE__).__drop__(view, true)
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def drop_if_exists(other), do: unquote(create_mod).drop(other)
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+
end
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+
end
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+
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@doc false
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def __create_view__(%View{name: name, query: query} = view, or_replace?) when query != nil do
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{sql, []} = Ecto.Migration.repo().to_sql(:all, query)
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or_replace = if or_replace?, do: "OR REPLACE ", else: ""
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+
if_exist = if or_replace?, do: "IF NOT EXIST ", else: ""
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materialized = if view.materialized?, do: "MATERIALIZED ", else: ""
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+
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Ecto.Migration.execute(
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"CREATE #{or_replace}#{materialized}VIEW #{name} AS #{sql}",
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"DROP #{if_exist}#{materialized}VIEW #{name}"
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)
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end
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+
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def __create_view__(_, _) do
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raise MissingQuery
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end
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+
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+
@doc false
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def __drop__(%View{name: name}, if_exists?) do
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if_exist = if if_exists?, do: "IF NOT EXIST ", else: ""
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+
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Ecto.Migration.execute("DROP #{if_exist}VIEW #{name}")
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+
end
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+
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@doc """
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Returns view struct that can be given to `Ecto.Migration.create/1`
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+
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```elixir
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create view("products_with_discount",
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+
from(p in "products",
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inner_join: d in "discounts",
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+
on: d.product_id == p.id,
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+
select: %{name: p.name}))
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+
```
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+
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+
Passed `query` will be checked if that query:
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+
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- Uses raw table name (usage of schemas is disallowed)
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+
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This is required to prevent making migration in future by editing schema.
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+
Each migration should be independent from the application code.
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+
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- Uses `Ecto.Query.select/3` with map
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+
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This is required to be able to set proper names for all columns in created
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+
view. So in case of `%{foo: a.foo, bar: b.bar}` resulting view with 2
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+
columns (`foo` and `bar`) containing respective selected fields.
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+
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If any of the above is false, then it will be rejected.
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+
"""
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def view(name), do: %View{name: name, query: nil}
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+
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+
def view(name, query), do: %View{name: name, query: expand_select(query)}
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+
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+
@doc """
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+
Returns materialized view struct that can be given to `Ecto.Migration.create/1`
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+
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+
See `view/2` for details.
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+
"""
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+
def materialized_view(name, query),
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+
do: %View{name: name, query: expand_select(query), materialized?: true}
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+
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+
defp expand_select(
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+
%Ecto.Query{select: %Ecto.Query.SelectExpr{expr: {:%{}, _, fields}} = select} = query
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+
) do
124
+
validate_source(query)
125
+
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+
encoded =
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+
for {name, value} <- fields do
128
+
{:fragment, [], expr: value, raw: "AS #{name}"}
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+
end
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+
131
+
%Ecto.Query{query | select: %Ecto.Query.SelectExpr{select | expr: encoded}}
132
+
end
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+
134
+
defp expand_select(%Ecto.Query{select: %Ecto.Query.SelectExpr{expr: ast}}) do
135
+
raise InvalidSelect, ast: ast
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+
end
137
+
138
+
defp validate_source(%Ecto.Query{from: %Ecto.Query.FromExpr{source: source}}) do
139
+
case source do
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+
{schema, nil} when is_binary(schema) -> :ok
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+
{_schema, mod} when is_atom(mod) ->
142
+
raise InvalidSource, schema: mod
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+
end
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+
end
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+
end
+54
mix.exs
+54
mix.exs
···
1
+
# SPDX-FileCopyrightText: 2026 Łukasz Niemier <~@hauleth.dev>
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+
#
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+
# SPDX-License-Identifier: Apache-2.0
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+
5
+
defmodule EctoView.MixProject do
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+
use Mix.Project
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+
8
+
def project do
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+
[
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+
app: :ecto_view,
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+
description: "Ecto helpers for creating and refreshing SQL views",
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+
package: [
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+
licenses: ["Apache-2.0"],
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+
links: %{
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+
"Tangled" => "https://tangled.org/hauleth.dev/ecto_view"
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+
}
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+
],
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+
version: "1.0.0",
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+
elixir: "~> 1.12",
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+
start_permanent: Mix.env() == :prod,
21
+
elixirc_paths: paths(Mix.env()),
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+
deps: deps(),
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+
docs: docs()
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+
]
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+
end
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+
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+
# Run "mix help compile.app" to learn about applications.
28
+
def application do
29
+
[
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+
extra_applications: [:logger]
31
+
]
32
+
end
33
+
34
+
defp docs do
35
+
[
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+
main: "readme",
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+
extras: ["README.md"]
38
+
]
39
+
end
40
+
41
+
defp paths(env) when env in ~w[dev test]a, do: ~w[lib test/support]
42
+
defp paths(_), do: ~w[lib]
43
+
44
+
# Run "mix help deps" to learn about dependencies.
45
+
defp deps do
46
+
[
47
+
{:ecto_sql, "~> 3.0"},
48
+
{:postgrex, ">= 0.0.0", only: [:dev]},
49
+
{:ex_doc, ">= 0.0.0", only: [:dev]}
50
+
# {:dep_from_hexpm, "~> 0.3.0"},
51
+
# {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
52
+
]
53
+
end
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+
end
+15
mix.lock
+15
mix.lock
···
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+
%{
2
+
"connection": {:hex, :connection, "1.1.0", "ff2a49c4b75b6fb3e674bfc5536451607270aac754ffd1bdfe175abe4a6d7a68", [:mix], [], "hexpm", "722c1eb0a418fbe91ba7bd59a47e28008a189d47e37e0e7bb85585a016b2869c"},
3
+
"db_connection": {:hex, :db_connection, "2.9.0", "a6a97c5c958a2d7091a58a9be40caf41ab496b0701d21e1d1abff3fa27a7f371", [:mix], [{:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "17d502eacaf61829db98facf6f20808ed33da6ccf495354a41e64fe42f9c509c"},
4
+
"decimal": {:hex, :decimal, "2.3.0", "3ad6255aa77b4a3c4f818171b12d237500e63525c2fd056699967a3e7ea20f62", [:mix], [], "hexpm", "a4d66355cb29cb47c3cf30e71329e58361cfcb37c34235ef3bf1d7bf3773aeac"},
5
+
"earmark_parser": {:hex, :earmark_parser, "1.4.44", "f20830dd6b5c77afe2b063777ddbbff09f9759396500cdbe7523efd58d7a339c", [:mix], [], "hexpm", "4778ac752b4701a5599215f7030989c989ffdc4f6df457c5f36938cc2d2a2750"},
6
+
"ecto": {:hex, :ecto, "3.13.5", "9d4a69700183f33bf97208294768e561f5c7f1ecf417e0fa1006e4a91713a834", [:mix], [{:decimal, "~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "df9efebf70cf94142739ba357499661ef5dbb559ef902b68ea1f3c1fabce36de"},
7
+
"ecto_sql": {:hex, :ecto_sql, "3.13.5", "2f8282b2ad97bf0f0d3217ea0a6fff320ead9e2f8770f810141189d182dc304e", [:mix], [{:db_connection, "~> 2.4.1 or ~> 2.5", [hex: :db_connection, repo: "hexpm", optional: false]}, {:ecto, "~> 3.13.0", [hex: :ecto, repo: "hexpm", optional: false]}, {:myxql, "~> 0.7", [hex: :myxql, repo: "hexpm", optional: true]}, {:postgrex, "~> 0.19 or ~> 1.0", [hex: :postgrex, repo: "hexpm", optional: true]}, {:tds, "~> 2.1.1 or ~> 2.2", [hex: :tds, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4.0 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "aa36751f4e6a2b56ae79efb0e088042e010ff4935fc8684e74c23b1f49e25fdc"},
8
+
"ex_doc": {:hex, :ex_doc, "0.40.1", "67542e4b6dde74811cfd580e2c0149b78010fd13001fda7cfeb2b2c2ffb1344d", [:mix], [{:earmark_parser, "~> 1.4.44", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_c, ">= 0.1.0", [hex: :makeup_c, repo: "hexpm", optional: true]}, {:makeup_elixir, "~> 0.14 or ~> 1.0", [hex: :makeup_elixir, repo: "hexpm", optional: false]}, {:makeup_erlang, "~> 0.1 or ~> 1.0", [hex: :makeup_erlang, repo: "hexpm", optional: false]}, {:makeup_html, ">= 0.1.0", [hex: :makeup_html, repo: "hexpm", optional: true]}], "hexpm", "bcef0e2d360d93ac19f01a85d58f91752d930c0a30e2681145feea6bd3516e00"},
9
+
"makeup": {:hex, :makeup, "1.2.1", "e90ac1c65589ef354378def3ba19d401e739ee7ee06fb47f94c687016e3713d1", [:mix], [{:nimble_parsec, "~> 1.4", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "d36484867b0bae0fea568d10131197a4c2e47056a6fbe84922bf6ba71c8d17ce"},
10
+
"makeup_elixir": {:hex, :makeup_elixir, "1.0.1", "e928a4f984e795e41e3abd27bfc09f51db16ab8ba1aebdba2b3a575437efafc2", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.2.3 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "7284900d412a3e5cfd97fdaed4f5ed389b8f2b4cb49efc0eb3bd10e2febf9507"},
11
+
"makeup_erlang": {:hex, :makeup_erlang, "1.0.3", "4252d5d4098da7415c390e847c814bad3764c94a814a0b4245176215615e1035", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm", "953297c02582a33411ac6208f2c6e55f0e870df7f80da724ed613f10e6706afd"},
12
+
"nimble_parsec": {:hex, :nimble_parsec, "1.4.2", "8efba0122db06df95bfaa78f791344a89352ba04baedd3849593bfce4d0dc1c6", [:mix], [], "hexpm", "4b21398942dda052b403bbe1da991ccd03a053668d147d53fb8c4e0efe09c973"},
13
+
"postgrex": {:hex, :postgrex, "0.22.0", "fb027b58b6eab1f6de5396a2abcdaaeb168f9ed4eccbb594e6ac393b02078cbd", [:mix], [{:db_connection, "~> 2.9", [hex: :db_connection, repo: "hexpm", optional: false]}, {:decimal, "~> 1.5 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:table, "~> 0.1.0", [hex: :table, repo: "hexpm", optional: true]}], "hexpm", "a68c4261e299597909e03e6f8ff5a13876f5caadaddd0d23af0d0a61afcc5d84"},
14
+
"telemetry": {:hex, :telemetry, "1.4.1", "ab6de178e2b29b58e8256b92b382ea3f590a47152ca3651ea857a6cae05ac423", [:rebar3], [], "hexpm", "2172e05a27531d3d31dd9782841065c50dd5c3c7699d95266b2edd54c2dafa1c"},
15
+
}
+3
mix.lock.license
+3
mix.lock.license
+35
test/ecto_view/migration_test.exs
+35
test/ecto_view/migration_test.exs
···
1
+
# SPDX-FileCopyrightText: 2026 Łukasz Niemier <~@hauleth.dev>
2
+
#
3
+
# SPDX-License-Identifier: Apache-2.0
4
+
5
+
defmodule EctoView.MigrationTest do
6
+
use ExUnit.Case
7
+
8
+
import Ecto.Query
9
+
10
+
@subject EctoView.Migration
11
+
12
+
doctest @subject
13
+
14
+
defmodule ExampleSchema do
15
+
use Ecto.Schema
16
+
17
+
schema "example_schema", do: nil
18
+
end
19
+
20
+
test "using schema as a source for view fails" do
21
+
query = from(e in ExampleSchema, select: %{})
22
+
23
+
assert_raise @subject.InvalidSource, fn ->
24
+
@subject.view("foo", query)
25
+
end
26
+
end
27
+
28
+
test "using schema as a source for materialized view fails" do
29
+
query = from(e in ExampleSchema, select: %{})
30
+
31
+
assert_raise @subject.InvalidSource, fn ->
32
+
@subject.materialized_view("foo", query)
33
+
end
34
+
end
35
+
end
+9
test/ecto_view_test.exs
+9
test/ecto_view_test.exs
+12
test/support/repo.ex
+12
test/support/repo.ex