Question

I am creating suggestions in my app as usual:

class SuggestionsController < ApplicationController
  def create
    @suggestion = current_user.suggestions.new(params[:suggestion])

    if @suggestion.save
      render :show, status: :created
    else
      render :error, status: :unprocessable_entity
    end
  end
end

Each suggestion belongs to a service (the service_id is sent to the create action in the params[:suggestion]).

When I return the suggestion to the client, I would like to include the details of the suggestion’s service in the JSON. This means that I should eager load it somewhere to save on database requests.

This would be fine if I was finding the suggestion:

Suggestion.includes(:service).find(params[:id])

Can I do something similar on saving?

@suggestion = current_user.suggestions.new(params[:suggestion])
# This doesn't work.
@suggestion.includes(:service).save

Answer 1

you can do this as part of default scope in your suggestion model

scope :includes(:service)