Add method :are_they_your_columns? to Shotengai::Model

lib/shotengai/controller/customer/product_snapshots_controller.rb

@@ -31,7 +31,6 @@ module Shotengai
         private
           def resource_params
             remark_input = params.require(resource_key).fetch(:remark_input, nil)&.map(&:permit!)
-
             params.require(resource_key).permit(
               :count, :shotengai_series_id
             ).merge({ remark_input: remark_input })

lib/shotengai/model.rb

@@ -2,5 +2,15 @@ module Shotengai
   class Model < ApplicationRecord
     self.abstract_class = true
     include Shotengai::JsonColumn
+
+    class << self
+      def are_they_your_columns? columns, type=nil
+        valid = self.columns.select{ |column| type.nil? || column.type.eql?(type.to_sym) }.map(&:name) 
+        need = Array(columns)
+        invalid = need - valid
+        raise Shotengai::WebError.new("Invalid columns: #{invalid}", -1, 400) if invalid.any?
+        need
+      end  
+    end
   end
 end
\ No newline at end of file