grails - GORM，一次一对多保存整个对象图不起作用，错误在哪里？

Question

问题:
GORM能够与子对象以一对多关系创建(保存)父对象。
Per this documentation example但是我的代码中有一个错误使它不可能。请帮我找到它:|

更新:
找不到几封错字的信件。 (由于STS无法在我的PC上运行...)
但是问题仍然存在。但是我对建议被抛出异常的建议感到困惑。仍然需要帮助。

父模型:

package tanktactics

class Guide {
    String title
    Date created
    SortedSet chapters

    static hasMany = [chapters: Chapter] //changed to has

    static constraints = {
    }
}

子模型:

package tanktactics

class Chapter implements Comparable {
    String title
    String content
    Integer sortOrder
    static belongsTo = [guide: Guide]

    static constraints = {
    }

    int compareTo(obj) {
        sortOrder.compareTo(obj.compareTo) //changed to sort
    }
}

从grails console打印输出:

import tanktactics.Guide
import tanktactics.Chapter

some_guide = new Guide(title: "First guide!", created: new Date())
some_guide.addToChapters(new Chapter(title: "Ch II", content: "Lorem II", sortOrder:1))
    .addToChapters(new Chapter(title: "Ch I", content: "Lorem", sortOrder:0))
    .save()

some_guide.title
some_guide.chapters[0].title
some_guide.chapters[0].content
some_guide.chapters[1].title
some_guide.chapters[1].content

groovy> import tanktactics.Guide 
groovy> import tanktactics.Chapter 
groovy> some_guide = new Guide(title: "First guide!", created: new Date()) 
groovy> some_guide.addToChapters(new Chapter(title: "Ch II", content: "Lorem II", sortOrder:1)).addToChapters(new Chapter(title: "Ch I", content: "Lorem", sortOrder:0)).save() 
groovy> some_guide.title 
groovy> some_guide.chapters[0].title 
groovy> some_guide.chapters[0].content 
groovy> some_guide.chapters[1].title 
groovy> some_guide.chapters[1].content 

Exception thrown

groovy.lang.MissingMethodException: No signature of method: tanktactics.Guide.addToChapters() is applicable for argument types: (tanktactics.Chapter) values: [tanktactics.Chapter : null]
Possible solutions: addToChapters(java.lang.Object), getChapters()
    at com.springsource.loaded.ri.ReflectiveInterceptor.jlrConstructorNewInstance(ReflectiveInterceptor.java:963)
    at com.springsource.loaded.ri.ReflectiveInterceptor.jlrMethodInvoke(ReflectiveInterceptor.java:1237)
    at temp_test.run(temp_test.groovy:6)
    at com.springsource.loaded.ri.ReflectiveInterceptor.jlrMethodInvoke(ReflectiveInterceptor.java:1237)
    at com.springsource.loaded.ri.ReflectiveInterceptor.jlrMethodInvoke(ReflectiveInterceptor.java:1237)

Answer 1

看来您在Guide类中拼写错误。您可能是说hasMany而不是hadMany。