Relation field type for selecting related records in forms.

Follows the same pattern as MishkaGervaz.Table.Types.Filter.Relation.

Modes

• :static - Load all options at once (default, for small datasets)
• :load_more - Paginated with "Load more" button
• :search - Searchable single select
• :search_multi - Searchable multi select

Examples

field :site_id, :relation do
  mode :static
  display_field :name
end

field :category_id, :relation do
  mode :search_multi
  search_field :name
  min_chars 1
end

Why the rendered ids carry the form's id

Every DOM id this type hands the adapter is scoped by the id of the form component that is rendering it — :table_id (the adapter's name for "the scope this control belongs to") comes from state_assigns.form_id, and :id comes from the Phoenix form field, which already carries the form's id. A page may mount two MishkaGervaz.Form.Web.Live components whose resources share a field name — /admin/dashboard/runtime/medias mounts one for MishkaCmsCore.Runtime.Media and one for MishkaCmsCore.Runtime.MediaCategory, and both have a site_id relation. Scoped only by field name, both would render search-select--site_id, and morphdom — which matches by id before anything else — would be free to patch one form's dropdown with the other form's markup.

See MishkaGervaz.Form.Behaviours.FieldType, MishkaGervaz.Form.Types.Field, and the table-side counterpart MishkaGervaz.Table.Types.Filter.Relation.