Declaring a rich text field on an Ecto schema.

Coelho stores the document inline, in a :map (jsonb) column on the table that owns it, rather than in a side table. Nothing here is polymorphic, so nothing needs a join: a post's body lives on the post, and Ecto.Changeset.cast/3 validates it like any other field.

defmodule MyApp.Post do
  use Ecto.Schema
  import Coelho.Ecto

  schema "posts" do
    field :title, :string
    rich_text :body
  end
end

The matching migration adds an ordinary map column:

alter table(:posts) do
  add :body, :map
end

Pass :document_schema to use something other than Coelho.Schema.default/0 — Ecto reserves :schema for the owning module. Build it once and hold it in a module, since it is read on every cast:

defmodule MyApp.RichText do
  @schema Coelho.Schema.new(nodes: [...], marks: [...])
  def schema, do: @schema
end

rich_text :body, document_schema: MyApp.RichText.schema()