Operation::Model

Including Model will add simple CRUD semantics to your operation to find/create a model in #setup!.

Note that this is not limited to ActiveRecord.

class Create < Trailblazer::Operation
  include Model
  model Comment, :create

Using the ::model method you have to define what model class to work with. The second argument specifies the action.

This will override model! as follows.

class Create < Trailblazer::Operation
  def model!
    Comment.new
  end

The model is automatically created for you in #setup! and hence available in process.

Validation

In validate, you don’t need to provide the model anymore.

def process(params)
  model #=> <Comment body=""> # created via #model!.
  validate(params[:thing]) do
    ..
  end
end

Actions

The following actions for ::model are available.

• :create calls Comment.new
• :update or :find will execute Comment.find(params[:id])

In process, you now have a new or existing model available.

API

You may override #instantiate_model!, create_model! or update_model! from the Model module if you need to change behavior.

Discussion

Note that this is really simple behavior. Do not use this module when you plan to use more complex models.