Formats Ecto changeset errors into a flat map structure for API responses.

Converts nested changeset errors into a user-friendly format with interpolated values and flattened keys for nested associations.

Examples

iex> changeset = %Ecto.Changeset{errors: [content: {"can't be blank", []}]}
iex> format_changeset_errors(changeset)
%{"content" => ["can't be blank"]}

iex> changeset = %Ecto.Changeset{
...>   errors: [
...>     content: {"should be at least %{count} character(s)", [count: 5]}
...>   ]
...> }
iex> format_changeset_errors(changeset)
%{"content" => ["should be at least 5 character(s)"]}

Nested Association Errors

For nested associations (e.g., has_many relationships), errors are flattened using bracket notation:

%{"jobs[0].name" => ["can't be blank"], "jobs[1].adaptor" => ["is invalid"]}

Parameters

• changeset - An Ecto.Changeset with validation errors

Returns

A map with string keys (field names) and list values (error messages). Returns an empty map if the changeset has no errors.