Fix rubocop complaints

Author: edwinthinks

.rubocop.yml

@@ -11,6 +11,7 @@ AllCops:
   Exclude:
     - "vendor/**/*"
     - "db/schema.rb"
+    - "db/partners_schema.rb"
     - "db/seeds.rb"
     - "db/migrate/*"
     - "bin/*"
@@ -440,5 +441,7 @@ Rails/WhereExists:
   Enabled: false
 Rails/WhereNot:
   Enabled: false
-Lint/EnsureReturn: # The service objects return self in an ensure block. Not using an explicit return does not do correct behavior
+Rails/HasAndBelongsToMany:
   Enabled: false
+Lint/EnsureReturn: # The service objects return self in an ensure block. Not using an explicit return does not do correct behavior
+  EAnabled: false

app/models/item_category.rb

@@ -16,5 +16,5 @@ class ItemCategory < ApplicationRecord
 
   belongs_to :organization
   has_many :items, -> { order(name: :asc) }, inverse_of: :item_category
-  has_and_belongs_to_many :partner_groups
+  has_many :partner_groups
 end

app/models/partner_group.rb

@@ -10,7 +10,7 @@
 #
 class PartnerGroup < ApplicationRecord
   belongs_to :organization
-  has_many :partners
+  has_many :partners, dependent: :nullify
   has_and_belongs_to_many :item_categories
 
   validates :organization, presence: true

app/services/partner_fetch_requestable_items_service.rb

@@ -1,5 +1,4 @@
 class PartnerFetchRequestableItemsService
-
   def initialize(partner_id:)
     @partner_id = partner_id
   end