grails - 对Grails中的Elastic Search结果调用findBy…时发生TransientObjectException

Question

我已经在运行grails 2.5.0的grails项目中成功设置了 flex 搜索插件。我可以搜索并获得结果。但是对结果的某些操作是不可能的，例如在一个域上调用通过GORM的findBy与另一个域进行交互的方法...

鉴于Foo类

class Foo {
   static searchable = true

   def getBars() {
      return Bar.findAllByFoo(this)
   }
}

酒吧类

class Bar {
   Foo foo
   static searchable = true
}

下面的第三行将导致TransientObjectException

def result = Foo.search("Some parameter")
def foo = result.searchResults.first()
def bars = foo.bars //Fails

异常(exception)

object references an unsaved transient instance - save the transient instance before flushing: org.example.Foo. Stacktrace follows:
Message: object references an unsaved transient instance - save the transient instance before flushing: org.example.Foo
Line | Method
->>  105 | methodMissing    in org.grails.datastore.gorm.GormStaticApi

在网络上搜索此问题会产生许多与GORM保存操作相关的命中情况，我想这不是问题。如果该对象不是从 flex 搜索结果中提取的，这将非常好，为什么我认为此问题与插件有关。

def foo = Foo.get(1)
def bars = foo.bars //Works

Answer 1

检查official documentation:

To map a parent/child relationship, the child element must either contain the parent element as a component or reference it as a referenced document. This component must be mapped as a parent in the child element.

Example:

class ParentElement {
…
}

class EmbeddingChild {
    ParentElement parentElement

    static searchable = {
        parentElement parent: true, component: true
    }
}

class ReferencingChild {
    ParentElement parentElement

    static searchable = {
        parentElement parent: true, reference: true
    }
}

还有 good example at the end。