Ref T3886. Broadly, fields break down into two types right now: fields which store data on the object (like DifferentialTitleField) and fields which store data in custom field storage.

The former type generally reads data from the object into local storage prior to editing, then writes it back afterward. Currently, this happens in didSetObject().

However, now that we load and set objects from ApplicationTransactionQuery, we'll do this extra read-field-values on view interfaces too. There, it's unnecessary and sometimes throws data-attached exceptions.

Instead, separate these concepts, and do all the read-from-object / read-from-storage in one logical chunk, separate from didSetObject().

• Edited Differential revision.
• Edited Maniphest task.
• Edited Project.
• Edited user profile.