added filter criteria models

front-api/models/category.rb

@@ -1,4 +1,5 @@
 class Category < ActiveRecord::Base
   has_many  :sub_categories
+  has_many :filter_criterias, as: :owner
   belongs_to :section
 end

front-api/models/filter_criteria.rb

@@ -0,0 +1,9 @@
+class FilterCriteria < ActiveRecord::Base
+  has_many :filter_criteria_values
+  belongs_to :owner, polymorphic: true
+
+  self.inheritance_column = :_type_disabled
+  def owner_type=(class_name)
+    super(class_name.constantize.base_class.to_s)
+  end
+end

front-api/models/filter_criteria_value.rb

@@ -0,0 +1,3 @@
+class FilterCriteriaValue < ActiveRecord::Base
+  belongs_to :filter_criteria
+end

front-api/models/section.rb

@@ -1,3 +1,4 @@
 class Section < ActiveRecord::Base
   has_many :categories
+  has_many :filter_criterias, as: :owner
 end

front-api/models/sub_category.rb

@@ -1,5 +1,6 @@
 class SubCategory < ActiveRecord::Base
   belongs_to :category
+  has_many :filter_criterias, as: :owner
 end