add create sell and buy crypto order mutations

app/graphql/resolvers/model_errors.rb

@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+module Resolvers
+  class ModelErrors
+    attr_reader :full_messages, :field_name, :messages, :path
+
+    def initialize(args)
+      @full_messages = args[:full_messages]
+      @field_name = args[:field_name]
+      @messages = args[:messages]
+      @path = args[:path]
+    end
+
+    def self.from_active_record_model(model)
+      return if model&.errors.blank?
+
+      model.errors.messages.map do |field, messages|
+        new(
+          full_messages: model.errors.full_messages_for(field),
+          field_name: field,
+          messages: messages,
+          path: ["attributes", field]
+        )
+      end
+    end
+
+    def self.from_active_record_model_errors(errors)
+      return if errors.blank?
+
+      errors.messages.map do |field, messages|
+        new(
+          full_messages: errors.full_messages_for(field),
+          field_name: field,
+          messages: messages,
+          path: ["attributes", field]
+        )
+      end
+    end
+  end
+end