[英]Grails 2.4.4 binding JSON nested objects
I have a model with 3 classes, A, Parent and Child. 我有一个3类的模型,A,Parent和Child。 A hasMany Parent, and Child extends Parent. 一个hasMany Parent,而Child扩展Parent。
I need to handle complex logic on the UI to create the model, and decided to POST a JSON object with the same structure of my domain model. 我需要处理UI上的复杂逻辑来创建模型,并决定以与域模型相同的结构发布JSON对象。 Now, I have an instance of A that has some instances of Child associated, that in a javascript object on the client side. 现在,我有一个实例A,该实例具有与Child相关联的某些实例,这些实例位于客户端的javascript对象中。
When I POST the javascript object, serializing it to a JSON string, the controller receives it ok, then I do: def a = new A(request.JSON); 当我发布javascript对象并将其序列化为JSON字符串时,控制器会正常接收它,然后执行以下操作:def a = new A(request.JSON);
The A instance is created, but on the hasMany relationship it has instances of Parent instead of instances of Child, so I lose all the attribute values from Child. A实例已创建,但是在hasMany关系上,它具有Parent实例而不是Child实例,因此我丢失了Child的所有属性值。
How can I tell Grails to create instances of Child instead of instances of Parent? 如何告诉Grails创建Child实例而不是Parent实例?
UPDATE 更新
The request.JSON structure received by the controller looks like this: 控制器接收到的request.JSON结构如下所示:
[
name: name,
group: none,
where: [
[
codeOperand: in_list,
archetypeId: openEHR-EHR-EVALUATION.problem_diagnosis.v1,
codeValues: [
aaa,
bbb
],
path: /data[at0001]/items[at0005]/value,
class: Child1,
terminologyIdValues: [
cie
],
rmTypeName: DV_CODED_TEXT,
terminologyIdOperand: eq
],
[
magnitudeValues: [
1,
22
],
archetypeId: openEHR-EHR-OBSERVATION.blood_pressure.v1,
path: /data[at0001]/events[at0006]/data[at0003]/items[at0004]/value,
unitsOperand: eq,
class: Child2,
magnitudeOperand: between,
rmTypeName: DV_QUANTITY,
unitsValues: [
mmHg
]
]
]
]
On this case I have 2 classes Child1 and Child2 that inherits from Parent. 在这种情况下,我有两个继承自Parent的类Child1和Child2。
I've added the "class" attribute to the objects because I read that might solve the problem but it didn't. 我已将“ class”属性添加到对象,因为我读到这可能会解决问题,但事实并非如此。
When I print the objects associated to the A instance, I got the right number of instances, but all the classes are "Parent", as you can see, some values are binded, but are all attributes of the Parent class. 当我打印与A实例关联的对象时,我得到了正确数量的实例,但是所有类都是“父”,如您所见,绑定了一些值,但都是Parent类的属性。
[
(archetypeId: openEHR-EHR-EVALUATION.problem_diagnosis.v1,
path: /data[at0001]/items[at0005]/value,
rmTypeName: DV_CODED_TEXT,
class: Parent),
(archetypeId: openEHR-EHR-OBSERVATION.blood_pressure.v1,
path: /data[at0001]/events[at0006]/data[at0003]/items[at0004]/value,
rmTypeName: DV_QUANTITY,
class: Parent)
]
最后,我创建了遍历JSON对象并创建域实例的代码。
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