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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
}
```
City-Street Unique Index Example
In this example, we have a City with many Streets, and we want to set the
street name to be unique under each city.
Generate Assets
go generate ./...