Ruby on Rails

I am not sure if this is related to your problem, but it has the same
symptom "Can't modify frozen hash", so I put it here for other people to
refer if needed.

I have the error "Can't modify frozen hash" when I query an array of
objects from the database, then do the following things

- Based on some conditions, I will update the array, or destroy objects
in the array out of database, or add more objects to the array.

- Save the objects in the array to the database.

The error happens when the code (with some logical bugs) deletes one of
the object in the database, but still keeps the object in the array.
Later on, when saving the array, it saves that deleted object also, so
the error "Can't modify frozen hash" happens.

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