ecto_nested_changeset

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ecto_nested_changeset

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Helpers for manipulating nested Ecto changesets

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# EctoNestedChangeset

This is a package for manipulating nested
[Ecto](https://github.com/elixir-ecto/ecto) changesets.

## Installation

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

```elixir
def deps do
  [
    {:ecto_nested_changeset, "~> 1.1.0"}
  ]
end
```

This package is tested against the Elixir and OTP versions that are still
supported upstream. Older versions down to the requirement in `mix.exs` may
still work, but they are not covered by CI and not officially supported.

## Usage

The primary use case of this library is the manipulation of
[Ecto](https://github.com/elixir-ecto/ecto) changesets
used as a source for dynamic, nested forms in
[Phoenix LiveView](https://github.com/phoenixframework/phoenix_live_view).

```elixir
category = %Category{
  posts: [
    %Post{
      id: 1,
      comments: [
        %Comment{body: "potato", id: 1},
        %Comment{body: "you", id: 2}
      ],
      title: "must"
    },
    %Post{comments: [], id: 2, title: "young"}
  ]
}

category
|> Ecto.Changeset.change()
|> append_at(:posts, %Post{title: "Padawan", comments: []})
|> prepend_at([:posts, 0, :comments], %Comment{body: "ecneitaP"})
|> delete_at([:posts, 0, :comments, 1], mode: {:action, :delete})
|> insert_at([:posts, 1], %Post{title: "have"})
|> append_at([:posts, 2, :comments], %Comment{body: "my"})
|> update_at([:posts, 0, :comments, 0, :body], &String.reverse/1)
|> Ecto.Changeset.apply_changes()

%Category{
  posts: [
    %Post{
      comments: [
        %Comment{body: "Patience"},
        %Comment{body: "you", id: 2}
      ],
      id: 1,
      title: "must"
    },
    %Post{title: "have"},
    %Post{
      comments: [%Comment{body: "my"}],
      id: 2,
      title: "young"
    },
    %Post{title: "Padawan"}
  ]
}
```

## Alternatives

Since Ecto 3.10, `Ecto.Changeset.cast_assoc/3` and `Ecto.Changeset.cast_embed/3`
take `:sort_param` and `:drop_param`, which add, remove and reorder items from
the form parameters while casting. If that is all you need, you should prefer
those functions.

This library works on a changeset that already exists, rather than on the
parameters one is built from. It covers array fields and the cases where you are
not casting parameters at all.

## Example application

There is an example Phoenix application with a dynamic nested LiveView form in
the `/example` folder of the repository.

```bash
git clone https://github.com/woylie/ecto_nested_changeset.git
cd ecto_nested_changeset/example
mix setup
mix phx.server
```

Note that Postgres needs to be running to use the application.

You can access the application at http://localhost:4000.

## Status

This library is actively maintained, but given its narrow purpose, it will not
see frequent updates.

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