在Grails GORM中搜索域对象的子级

Question

How can I write this code correctly in Groovy / Gorm?

I have a PageComponent domain class that has many Content 's. I want to see if a particular PageComponent contains a Content with a specfific key .

I thought I could say:

def pageComponent = PageComponent.get(1);

if (pageComponent.contents.findByKey("textnode") {
  // update
} else {
  // insert
}

At the moment, I'm using this instead. Not very elegant...

def pageComponent = PageComponent.get(1);

def content = Content.withCriteria {
    eq "pageComponent.id", pageComponent.id
    eq "key", "textnode"
}

Answer 1

您还可以使用动态查找器：

Content.findByPageComponentAndKey(pageComponent, "textnode")