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b150cde478
This introduces the concept of validation errors, where we have a high
level validation error which wraps a more detailed error message.
The higher level `ValidationError` is set up in the generated files, much
like the `NotFoundError` and `ConstraintError` and is accompanied by an
`IsValidationError` check method. Thus, it can be used as follows:
```go
t, err := tx.Team.Create().SetName(input.Name).Save(ctx)
if ent.IsValidationError(err) {
// handle validation error response
}
```
Linked-List O2O Relation Example
An example for a O2O recursive relation between linked-list nodes.
Each node in the list can have only of next. If a node A points (using next) to a node B,
B can get its pointer using prev.
Generate Assets
go generate ./...
Run Example
go test