<!--
SPDX-FileCopyrightText: 2026 Łukasz Niemier <~@hauleth.dev>

SPDX-License-Identifier: Apache-2.0
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# EctoView

Helper functions for creating database views using `Ecto.Query` helpers.

## Installation

Add `ecto_view` to your list of dependencies in `mix.exs`:

```elixir
def deps do
  [
    {:ecto_view, "~> 1.0"}
  ]
end
```

## Usage

```elixir
defmodule MyApplication.Repo.Migration.CreateViewFoo do
  use Ecto.Migration
  use EctoView.Migration # This line **MUST** be after `use Ecto.Migration`

  def change do
    query = from foo in "foos", # This **MUST** select from table name, no schemas allowed
      where: foo.bar == 2137,
      select: %{ # This **MUST** be a map of selected fields
        a: foo.a,
        b: foo.b
      }

    create view("foos_view", query)
  end
end
```

If you want, you can also create materialised view using `materialized_view/2`
function.

If you create materialised view, then you can use `EctoView.refresh_materialized_view/3`
function to refresh content of given view. If you will add:

```elixir
defmodule MyApplication.Repo do
  use Ecto.Repo, …
  use EctoView

  # …
end
```

Then there will be a helper function `Repo.refresh_materialised_view/2` that
will call respective function for that repo.

The docs can be found at [https://hexdocs.pm/ecto_view](https://hexdocs.pm/ecto_view).