Let jsonapi_resource recognize immutable

Currently, `create`, `update`, `destroy` routes are generated for resources that are marked as immutable. This change fixes that bug.

Author: yawboakye

lib/jsonapi/routing_ext.rb

@@ -32,6 +32,12 @@ def jsonapi_resource(*resources, &_block)
  options[:except] = [:new, :edit]
  end
 
+ if res._immutable
+ options[:except] << :create unless options[:except].include?(:create) || options[:except].include?('create')
+ options[:except] << :update unless options[:except].include?(:update) || options[:except].include?('update')
+ options[:except] << :destroy unless options[:except].include?(:destroy) || options[:except].include?('destroy')
+ end
+
  resource @resource_type, options do
  # :nocov:
  if @scope.respond_to? :[]=
@@ -96,9 +102,9 @@ def jsonapi_resources(*resources, &_block)
  end
 
  if res._immutable
- options[:except] << :create
- options[:except] << :update
- options[:except] << :destroy
+ options[:except] << :create unless options[:except].include?(:create) || options[:except].include?('create')
+ options[:except] << :update unless options[:except].include?(:update) || options[:except].include?('update')
+ options[:except] << :destroy unless options[:except].include?(:destroy) || options[:except].include?('destroy')
  end
 
  resources @resource_type, options do