Method test_session_merge

test/ext/test_mutable.py:217–250

test #8446

(
        self, decl_base, connection, present, load, merge_subject
    )

    )
    @testing.requires.json_type
    def test_session_merge(
        self, decl_base, connection, present, load, merge_subject
    ):
        """test #8446"""

        class Thing(decl_base):
            __tablename__ = "thing"
            id = Column(Integer, primary_key=True)
            data = Column(MutableDict.as_mutable(JSON))

        decl_base.metadata.create_all(connection)

        with Session(connection) as sess:
            sess.add(Thing(id=1, data={"foo": "bar"}))
            sess.commit()

        if merge_subject == "transient":
            t1_to_merge = Thing(id=1, data={"foo": "bar"})
        elif merge_subject == "detached":
            with Session(connection) as sess:
                t1_to_merge = sess.get(Thing, 1)

        with Session(connection) as sess:
            already_present = None
            if present == "key_present":
                already_present = sess.get(Thing, 1)

            t1_merged = sess.merge(t1_to_merge, load=load)

            t1_merged.data["foo"] = "bat"
            if present == "key_present":
                is_(t1_merged, already_present)

            is_true(inspect(t1_merged).attrs.data.history.added)

    def test_no_duplicate_reg_w_inheritance(self, decl_base):
        """test #9676"""