Follow-up from #2226197: Introduce FieldStorageDefinitionInterface in the Entity Field API.

Problem

As discussed there at comment #30 and the following comments configurable field storage right now respects the field cardinality settings *during* the load()/save() operations. As I'd have expected that to influence validation only, this was quite a WTF to me.

Moreover this might result in data loss if:
- a field has e.g. 5 possible values and a node has 5 values
- the admin changes the field so that only 3 values are allowed.
- Now only the first 3 values are loaded and viewed, but the data remains.
- Now, a user edits the node and re-saves it - possibly even without even knowing/seeing our field with 3/5 values due to field access
- The node ends up being saved with only 3 values, the remaining two values are lost now

Proposal:

Respect field cardinality only during validation. Entity storage should store/load whatever is in the storage/entity.
Move the field cardinality setting to FieldDefinitionInterface as it does not influence storage at all - for the storage it's only important to know whether a field is multiple or not what would remain on StorageFieldDefinitionInterface (or whatever it ends up being called).

Comments

xjm’s picture

This would be a minor public API change, correct?

fago’s picture

Issue tags: +API change

yes, it results in the constant being moved away from FieldConfigInterface and the not yet existing StorageFieldDefinitionInterface.

tstoeckler’s picture

I thought the constant should be on FieldDefinitionInterface per this issue? And only the multiple/not-multiple flag should be on StorageFieldDefinitionInterface? Still an API change, but...

fago’s picture

yes, by moving ot form FieldStorageDefinitionInterface to FieldDefinitionInterface, FieldConfigInterface stops inheriting it. So it results in being moved away from FieldConfigInterface. Imo, that's not a problem as all occurrences should be FieldDefinitionInterface::CARDINALITY_UNLIMITED then anyway.

Also, I'm unpostponing this as #2226197: Introduce FieldStorageDefinitionInterface in the Entity Field API got committed.

fago’s picture

Status: Postponed » Active

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