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Fixed #28987 -- Fixed altering ManyToManyField when changing to self-referential.

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DevilsAutumn 2022-11-11 00:13:16 +05:30 • committed by Mariusz Felisiak
parent 2848e5d0ce
commit 81b1c167bf
2 changed files with 68 additions and 18 deletions
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37
tests/migrations/test_operations.py
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@ -1796,6 +1796,43 @@ class OperationTests(OperationTestBase):
self.assertTableExists(original_m2m_table)
self.assertTableNotExists(new_m2m_table)
def test_alter_model_table_m2m_field(self):
app_label = "test_talm2mfl"
project_state = self.set_up_test_model(app_label, second_model=True)
# Add the M2M field.
project_state = self.apply_operations(
app_label,
project_state,
operations=[
migrations.AddField(
"Pony",
"stables",
models.ManyToManyField("Stable"),
)
],
)
m2m_table = f"{app_label}_pony_stables"
self.assertColumnExists(m2m_table, "pony_id")
self.assertColumnExists(m2m_table, "stable_id")
# Point the M2M field to self.
with_field_state = project_state.clone()
operations = [
migrations.AlterField(
model_name="Pony",
name="stables",
field=models.ManyToManyField("self"),
)
]
project_state = self.apply_operations(
app_label, project_state, operations=operations
)
self.assertColumnExists(m2m_table, "from_pony_id")
self.assertColumnExists(m2m_table, "to_pony_id")
# Reversal.
self.unapply_operations(app_label, with_field_state, operations=operations)
self.assertColumnExists(m2m_table, "pony_id")
self.assertColumnExists(m2m_table, "stable_id")
def test_alter_field(self):
"""
Tests the AlterField operation.