Question

I’ve a component model that has_many :framework. But the :framework don’t belongs_to :component, because a framework could belong to lots of components.

I’ve a controller that returns a json with the frameworks of a concret component:

def getFrameworks
    @component = Component.find(params[:component_id])
   respond_to do |format|
      format.html { redirect_to components_url }
      format.json { render json: @component.frameworks, location: @component }
   end
end

But it gives me the following error:

SQLite3::SQLException: no such column: frameworks.component_id: SELECT "frameworks".* FROM "frameworks"  WHERE "frameworks"."component_id" = 298

Am I defining wrong the model? What’s wrong?

Answer 1

A has_manyneeds a belongs_toon the related model, for your case
I believe you want to use the has_and_belongs_to_many relation, see the doc

Here is an example of the migration you will need :

class CreateComponentsFrameworks < ActiveRecord::Migration
  def change
    create_table :components_frameworks, :id => false do |t|
      t.integer :component_id
      t.integer :framework_id
    end
  end
end