In this PR, we add some validation logic and rules in both FE and BE to
ensure field permissions are handled correctly for relation fields.
- (BE) Only one field permission per fieldMetadata is accepted per
input. This is already guaranteed in the FE. It was added to help
guarantee that, when looking within the field permissions input for a
potential field permission on a relationTargetFieldMetadataId for a
relation field, there can only be 0 or 1.
- (FE) Only field permission with new values are sent to save, to avoid
sending contradictory field permissions for related fields. E.g. let's
say I have an existing field permission restricting read permission on
company's people field. By definition I also have one on person's
company field. If I update this field permission to enable the read
permission by updating company's people field, in the previous logic I
was also going to send for upsert the existing obsolete field permission
on person's company. Thus the server does not know which is the right
value so we should only send the new value.
- (BE) If the server receives two contradictory field permissions on two
related fields, e.g. on company's people with canRead = null and
person's company with canRead = false, it throws an error.
