Added has_and_belongs_to_many relation support

lib/model/active_record/relation/has_and_belongs_to_many.rb

@@ -0,0 +1,13 @@
+module Regressor
+  module Model
+    module Relation
+      module HasAndBelongsToMany
+        def has_and_belongs_to_many_relations
+          @model.constantize.reflect_on_all_associations(:has_and_belongs_to_many).map(&:name).map do |relation|
+            "it { is_expected.to have_and_belong_to_many :#{relation} }"
+          end.join("\n  ")
+        end
+      end
+    end
+  end
+end

lib/model/active_record_model.rb

@@ -1,5 +1,6 @@
 require_relative 'active_record/util'
 require_relative 'active_record/relation/belong_to'
+require_relative 'active_record/relation/has_and_belongs_to_many'
 require_relative 'active_record/relation/has_one'
 require_relative 'active_record/relation/has_many'
 require_relative 'active_record/validation/presence'
@@ -17,6 +18,7 @@ module Model
     class ActiveRecordModel
       # === Includes ===
       include Relation::BelongTo
+      include Relation::HasAndBelongsToMany
       include Relation::HasOne
       include Relation::HasMany
       include Validation

lib/templates/model/active_record/model_template.erb

@@ -4,6 +4,7 @@ RSpec.describe <%= @model.model %>, regressor: true do
 
   # === Relations ===
   <%= @model.belong_to_relations %>
+  <%= @model.has_and_belongs_to_many_relations %>
   <%= @model.has_one_relations %>
   <%= @model.has_many_relations %>