rmorrise opened a new issue, #14607:
URL: https://github.com/apache/grails-core/issues/14607
### Task List
- [x] Steps to reproduce provided
- [x] Stacktrace (if present) provided
- [x] Example that reproduces the problem uploaded to Github
- [x] Full description of the issue provided (see below)
### Steps to Reproduce
1. Start with the previous example (linked below)
2. On the `Detail` domain class, add a class-level annotation:
`@BindUsing(DetailBindHelper)`
3. Create a `DetailBindHelper` class that returns: `new
FooDetail(fooProperty: source['fooProperty'])`
4. POST to /master with the following data:
```
{
"details": [
{"detailType": "FOO", "fooProperty": "foo"}
]
}
```
### Expected Behaviour
`BindingHelper#getPropertyValue()` should be invoked only once for each
child object converted. The object returned from this method should be added to
the collection on the parent object.
### Actual Behaviour
`BindingHelper#getPropertyValue()` seems to be invoked twice for each child
object in the input.
The object returned from this method is never used in the calling code.
See: `SimpleDataBinder#convert(Class, value)`, lines 782-784
The conversion result ends up being a blank object.
### Environment Information
- **Operating System**: Win7 x64
- **GORM Version:** 6.1.6.RELEASE
- **Grails Version (if using Grails):** 3.3.0
- **JDK Version:** 1.8.0_131
### Example Application
-
[https://github.com/rmorrise/bindToSubclassExample](https://github.com/rmorrise/bindToSubclassExample)
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