我有这个问题:org.hibernate.LazyInitializationException:failedtolazilyinitializeacollectionofrole:mvc3.model.Topic.comments,nosessionorsessionwasclosed这是模型:@Entity@Table(name="T_TOPIC")publicclassTopic{@Id@GeneratedValue(strategy=GenerationType.AUTO)privateintid;@ManyToOne@JoinColumn(name="USER_ID")pri

每个用户都有很多角色；要查明用户是否具有“admin”角色，我们可以使用has_role?方法:some_user.has_role?('admin')定义如下:defhas_role?(role_in_question)roles.map(&:name).include?(role_in_question.to_s)end我希望能够将some_user.has_role?('admin')写成some_user.is_admin?，所以我做到了:defmethod_missing(method,*args)ifmethod.to_s.match(/^is_(\w+)[?]$/)has

我收到一个错误消息，指出此方法不存在，但这看起来相当基本，我不确定为什么会收到此错误消息？it{shouldvalidate_presence_of:role}#ThisisOK.Failure/Error:it{shouldvalidate_inclusion_of:role,:in=>%w[onetwothree]}NoMethodError:undefinedmethod`validate_inclusion_of'for#对于代码:classUser[one,twothree]]http://apidock.com/rails/ActiveModel/Validations/C

我知道您可以像这样重写创建工厂对象的默认策略:Factory.define:person,:default_strategy=>:builddo#stuffendFactory.define:person,:default_strategy=>:createdo#stuffend#samebehaviorasthepreviousfactoryFactory.define:persondo#stuffend但我想知道我是否可以在factory_girl配置文件或/environments/test.rb文件中添加设置，以便Factory.define:persondo#stuffend