我刚开始学习 Grails，我正在尝试使用 grails 控制台来玩数据库，但我注意到 runninggrails console和 running之间存在差异grails，然后console：
grails console直接从终端启动时：
~/Desktop/Grails-lab/racetrack $ grails console
| Compiling 1 source files.....
在console：
groovy> import racetrack.*
groovy> def z = new User(userName:"bangkuangwang",fullName:"noge noge",website:"noge.com",email:"email@email.com",bio:"hello world",password:"123123")
groovy> z.save()
groovy> println(z.errors)
groovy> User.count
grails.validation.ValidationErrors: 0 errors
Result: 1
使用 启动时grails，然后console：
~/Desktop/Grails-lab/racetrack $ grails
| Enter a script name to run. Use TAB for completion:
grails> console
| Compiling 1 source files.....
在console：
groovy> import racetrack.*
groovy> def z = new User(userName:"bangkuangwang",fullName:"noge noge",website:"noge.com",email:"email@email.com",bio:"hello world",password:"123123")
groovy> z.save()
groovy> println(z.errors)
groovy> User.count
Exception thrown
groovy.lang.MissingMethodException: No signature of method: racetrack.User.save() is applicable for argument types: () values: []
Possible solutions: save(), save(boolean), save(java.util.Map), wait(), last(), any()
at com.springsource.loaded.ri.ReflectiveInterceptor.jlrConstructorNewInstance(ReflectiveInterceptor.java:963)
at racetrack.User.save(User.groovy)
at racetrack.User$save.call(Unknown Source)
at ConsoleScript0.run(ConsoleScript0:3)
at com.springsource.loaded.ri.ReflectiveInterceptor.jlrMethodInvoke(ReflectiveInterceptor.java:1231)
at com.springsource.loaded.ri.ReflectiveInterceptor.jlrMethodInvoke(ReflectiveInterceptor.java:1231)
谁能向我解释为什么启动 grails 控制台的两种方法的行为不同？