[5.5] Use fill instead of forceFill while storing pivot attributes

[themsaid]

This change allows CustomModels to control fillable attributes. By default all attributes are fillable in the Pivot built-in class.

[antonkomarev]

You've got typo in the title: "Use FORCE instead ...".

[themsaid]

@a-komarev haha, thanks :D

[antonkomarev]

Use The Force, Luke!

[mpyw]

@taylorotwell @themsaid When all extra attributes are not fillable, ORM runs broken SQL:

UPDATE table_name SET WHERE foo = 1 AND bar = 2

Then we get PDOException. Is this an expected behavior?

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I'm organizing complicated relations so custom pivot table has the third foreign key. How can I fill it with syncWithoutDetaching()?

Should we have the option $forceFill = false?