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fix(ngFor): give more instructive error when binding to non-iterable

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Before, you'd get an error like:

```
EXCEPTION: Cannot find a differ supporting object ‘[object Object]’ in [users in UsersCmp@2:14]
```

Now, you get:

```
EXCEPTION: Cannot find a differ supporting object ‘[object Object]’ of type 'Object'. Did you mean to bind ngFor to an Array? in [users in UsersCmp@2:14]
```
This commit is contained in:
Brian Ford
2016-03-09 12:05:15 -08:00
parent 0898bca939
commit 49527ab495
5 changed files with 35 additions and 6 deletions
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5
modules/angular2/src/core/change_detection/differs/iterable_differs.ts
View File

@ -1,4 +1,4 @@
import {isBlank, isPresent, CONST} from 'angular2/src/facade/lang';
import {isBlank, isPresent, CONST, getTypeNameForDebugging} from 'angular2/src/facade/lang';
import {BaseException} from 'angular2/src/facade/exceptions';
import {ListWrapper} from 'angular2/src/facade/collection';
import {ChangeDetectorRef} from '../change_detector_ref';
@ -86,7 +86,8 @@ export class IterableDiffers {
if (isPresent(factory)) {
return factory;
} else {
throw new BaseException(`Cannot find a differ supporting object '${iterable}'`);
throw new BaseException(
`Cannot find a differ supporting object '${iterable}' of type '${getTypeNameForDebugging(iterable)}'`);
}
}
}