force object to be `dirty` in sqlalchemy

Question

Is there a way to force an object mapped by sqlalchemy to be considered dirty? For example, given the context of sqlalchemy\'s Object Relational Tutorial the p

Answer 1

The flag_modified approach works if one know that attribute have a value present. SQLAlchemy documentation states:

Mark an attribute on an instance as ‘modified’.

This sets the ‘modified’ flag on the instance and establishes an unconditional change event for the given attribute. The attribute must have a value present, else an InvalidRequestError is raised.

Starting with version 1.2, if one wants to mark an entire instance then flag_dirty is the solution:

Mark an instance as ‘dirty’ without any specific attribute mentioned.