Collections

Operations can also be used to present collections. This is often used in Index operations.

class Comment::Index < Trailblazer::Operation
  include Collection

  def model!(params)
    Comment.all
  end
end

You include the Collection module and override #model! to aggregate the collection of objects.

This operation won’t need a contract, as it is presentation, only.

Presenting Collections

You can instantiate the collection operation manually.

op = Comment::Index.present(params)
op.model #=> [<Comment>, ..]

Or use the present controller helper.

def index
  present Comment::Index
end

This will set the @model instance variable to your collection.

Pagination

Scoping