Add a generator for Rails

lib/generators/serializer/USAGE

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+Description:
+    Generates a serializer for the given model.
+
+Example:
+    rails generate serializer Movie
+
+    This will create:
+        app/serializers/movie_serializer.rb

lib/generators/serializer/serializer_generator.rb

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+require 'rails/generators/base'
+
+class SerializerGenerator < Rails::Generators::NamedBase
+  source_root File.expand_path('templates', __dir__)
+
+  argument :attributes, type: :array, default: [], banner: 'field field'
+
+  def create_serializer_file
+    template 'serializer.rb.tt', File.join('app', 'serializers', class_path, "#{file_name}_serializer.rb")
+  end
+
+  private
+
+    def attributes_names
+      attributes.map { |a| a.name.to_sym.inspect }
+    end
+end

lib/generators/serializer/templates/serializer.rb.tt

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+<% module_namespacing do -%>
+class <%= class_name %>Serializer
+  include FastJsonapi::ObjectSerializer
+  attributes <%= attributes_names.join(", ") %>
+end
+<% end -%>