Rails 4: How to use includes() with where() to retrieve associated objects

Question

I can\'t figure out how to user the .where() method to retrieve associated model data. In this example, Projects belongs_to Users...

class Project &         


        

Answer 1

Eager loading, N+1 query optimization is really an efficient way of loading associations in a single call.

- includes() with where() and find()

@project = Project.includes(:user).where(hashed_id: params[:id]).first
@project = Project.where(hashed_id: params[:id]).includes(:user).first

* In some cases, It can be useful*

@projects = Project.find(:all, :includes => :user)
@projects = Project.find(:all, :include => [{:association1 => [:associationA, :associationB, ....]}]