grails - 使用参数查询关联的域对象给出错误 : Cannot query property "params" - no such property on class

Question

我有两个域对象:
户主和地址，

在 HeadOfHousehold 我有以下关系:

Address currentAddress
Address previousAddress

在地址我有:

static belongsTo = [headOfHousehold: HeadOfHousehold]

我有以下查询:

def customers = HeadOfHousehold.findAll {
            if(params.lastName){
                lastName =~ params.lastName+ "%"
            }
            if(params.firstName){
                firstName =~ params.firstName + "%"
            }
            if(params.middleName){
                middleName =~ params.middleName + "%"
            }
            if(params.city){
                currentAddress.city =~ params.city+ "%"
            }
            if(params.zipCode){
                currentAddress.zipCode == params.zipCode
            }
            if(params.extendedZipCode){
                currentAddress.extendedZipCode == params.extendedZipCode
            }

        }

问题出在我得到错误的最后三个语句上:
Cannot query property "params" - no such property on class HeadOfHousehold
当我进入地址时，它不会提示与 lastName firstName 或 middleName 相关的查询。我可以通过将参数保存在字符串中并以这种方式来解决它:

String city = params.city + "%"
        String zipCode = params.zipCode
        String extendedZipCode = params.extendedZipCode
        String state = params.state
        def customers = HeadOfHousehold.findAll {
            if(params.lastName){
                lastName =~ params.lastName+ "%"
            }
            if(params.firstName){
                firstName =~ params.firstName + "%"
            }
            if(params.middleName){
                middleName =~ params.middleName + "%"
            }
            if(params.city){
                currentAddress.city =~ city 
            }
            if(params.state){
                currentAddress.state == state
            }
            if(params.zipCode){
                currentAddress.zipCode == zipCode
            }
            if(params.extendedZipCode){
                currentAddress.extendedZipCode == extendedZipCode
            }

        }

为什么这是必要的？我究竟做错了什么？ (使用 grails 2.3.8 版)

Answer 1

试图匹配关联或属性的属性，它看起来 params作为父类的属性。我不完全确定这是否是预期的行为。我会更多地研究它。

但是您可以通过使用您所做的方式或仅使用与 . 相比的闭包方法(DSL 方式)很好地克服这个问题。手术。例如:

if(params.city){
    currentAddress { city =~ params.city+ "%" }
}
if(params.zipCode){
    currentAddress { zipCode == params.zipCode } 
}
if(params.extendedZipCode){
    currentAddress { extendedZipCode == params.extendedZipCode }
}