paging done, needs some additional refactoring

front-api/models/item.rb

@@ -10,7 +10,13 @@ class Item < ActiveRecord::Base
 
   # TODO: change "best selling" algorithm when get some data - currently it's only sorted by earnings
   scope :best_selling, -> (offset, limit) { where(:on_display => true).order("(list_price - current_input_price) DESC").limit(limit).offset(offset) }
+
   scope :best_selling_in_sub_category, -> (sub_category_id, offset, limit) {  best_selling(offset, limit).where(sub_category_id: sub_category_id) }
+
   scope :best_selling_in_category, -> (category_id, offset, limit) {  best_selling(offset, limit).joins( sub_category: [:category] ).where(["category_id = ?", category_id]) }
+
   scope :best_selling_in_section, -> (section_id, offset, limit) {  best_selling(offset, limit).joins( sub_category: [category: [ :section ]] ).where( ["section_id = ?", section_id] ) }
+
+  scope :all_in_category, -> (category_id) { where(on_display: true).joins( sub_category: [:category]).where(["category_id = ?", category_id]) }
+
 end

front-api/models/sub_category.rb

@@ -1,6 +1,7 @@
 class SubCategory < ActiveRecord::Base
   belongs_to :category
   has_many :filter_criterias, as: :owner
+  has_many :items
 end