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  # POST
  def check_assignation
    @inventory_ids = params[:inv]
    @inventories = OleCore::Inventory.includes(:course, account: {subscription: :subscription_plan})
                                     .where(id: params[:inv])
    
    prevent_empty_trainees_and_courses
    
    # If this assignation doesn't require addons, no confirmation required either.
    if !CourseAssigner.requires_addons?(@inventories, @checked_users, current_user)

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Spree::LineItem.class_eval do
  def offering
    variant.offering(self.qty)
  end
end

Spree::Variant.class_eval do

  # has_many :volume_prices (viene de la gema)
  has_many :offerings

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Failures:

  1) Spree::Admin::VariantsController POST Create a new variant with associated course
     Failure/Error: Spree::Variant.all.count.should eq(2)
       
       expected: 2
            got: 1
       
       (compared using ==)
     # ./spec/controllers/spree/admin/variants_controller_spec.rb:26:in `block (3 levels) in <top (required)>'

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class Search
  def initialize(searchable)
    @searchable = searchable
  end
  
  def starts_with(letter, attribute)
    @searchable.where(attribute=> 'letter') # would be some variant of a LIKE query.
  end
end

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class ContentProviderCalculator
  def calculate(commissionable)
    olei = # find olei content provider
    olec = # find olec content provider
    
    content_amount = commissionable.subtotal * .2 # 20% goes to content providers
    if commissionable.premium?
      # create commission for olei of 66.7% of content_amount
      # create commission for olec of 33.3% of content_amount
    else

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def update
  # fetch @conversation having its rank updated.
  #
  conversations = @discussion.conversations.order(:rank).to_a
  
  # Move conversation to new position by inserting in array at rank and deleting it from previous position.
  conversations.insert(@conversation.rank, conversations.delete_at(@conversation))
  
  # Update all conversation ranks to correspond to new array order.
  # Very inefficient as this uses a n+1 query. You could optimize to use update_all

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class ResultSetsController < ApplicationController
  def index
    @survey = Survey.find(params[:id]) # should be :survey_id if you want to conform to rails standard.
    @quiz = @survey.quiz # try to retrieve quiz from survey, you should not have to load all the result sets to find the right quiz id.
    @result_sets = Survey.result_sets.owned_by(result_set_owner)
    # Rest of code follows below but requires major refactoring.
  end
  
  private
  

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class Programme < AR::Base
  has_many :villages
  has_many :conversations, though: :villages
end

class Village < AR::Base
  has_many :discussions
  has_many :conversations, through: :discussions
end

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class Change < ActiveRecord::Base
  has_many :conversations

  validates :name, presence: true

  def self.top_ranked(load_conversation=true)
    with_rank(load_conversation).order("conversations_rank desc").limit(1)
  end
   
  def self.with_rank(load_conversation=true)

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class Village < AR::Base
  has_many :discussions
  has_many :conversations, through: :discussions
  has_many :changes, through: :conversations
  
  def top_change
    changes.merge Change.top_ranked(false)
  end

end