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Refs #27064 -- Refactored out MigrationAutodetector.create_renamed_fields().

This commit is contained in:
David Wobrock 2022-05-11 16:05:50 +02:00 committed by Mariusz Felisiak
parent c6cec3c2d2
commit a098cde968
1 changed files with 59 additions and 25 deletions
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84
django/db/migrations/autodetector.py
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@ -122,6 +122,7 @@ class MigrationAutodetector:
self.generated_operations = {}
self.altered_indexes = {}
self.altered_constraints = {}
self.renamed_fields = {}
# Prepare some old/new state and model lists, separating
# proxy models and ignoring unmigrated apps.
@ -169,6 +170,11 @@ class MigrationAutodetector:
self.generate_altered_options()
self.generate_altered_managers()
# Create the renamed fields and store them in self.renamed_fields.
# They are used by create_altered_indexes(), generate_altered_fields(),
# generate_removed_altered_index/unique_together(), and
# generate_altered_index/unique_together().
self.create_renamed_fields()
# Create the altered indexes and store them in self.altered_indexes.
# This avoids the same computation in generate_removed_indexes()
# and generate_added_indexes().
@ -907,11 +913,12 @@ class MigrationAutodetector:
),
)
def generate_renamed_fields(self):
def create_renamed_fields(self):
"""Work out renamed fields."""
self.renamed_fields = {}
self.renamed_operations = []
old_field_keys = self.old_field_keys.copy()
for app_label, model_name, field_name in sorted(
self.new_field_keys - self.old_field_keys
self.new_field_keys - old_field_keys
):
old_model_name = self.renamed_models.get(
(app_label, model_name), model_name
@ -922,7 +929,7 @@ class MigrationAutodetector:
# Scan to see if this is actually a rename!
field_dec = self.deep_deconstruct(field)
for rem_app_label, rem_model_name, rem_field_name in sorted(
self.old_field_keys - self.new_field_keys
old_field_keys - self.new_field_keys
):
if rem_app_label == app_label and rem_model_name == model_name:
old_field = old_model_state.get_field(rem_field_name)
@ -947,37 +954,64 @@ class MigrationAutodetector:
if self.questioner.ask_rename(
model_name, rem_field_name, field_name, field
):
# A db_column mismatch requires a prior noop
# AlterField for the subsequent RenameField to be a
# noop on attempts at preserving the old name.
if old_field.db_column != field.db_column:
altered_field = field.clone()
altered_field.name = rem_field_name
self.add_operation(
self.renamed_operations.append(
(
rem_app_label,
rem_model_name,
old_field.db_column,
rem_field_name,
app_label,
operations.AlterField(
model_name=model_name,
name=rem_field_name,
field=altered_field,
),
model_name,
field,
field_name,
)
self.add_operation(
app_label,
operations.RenameField(
model_name=model_name,
old_name=rem_field_name,
new_name=field_name,
),
)
self.old_field_keys.remove(
old_field_keys.remove(
(rem_app_label, rem_model_name, rem_field_name)
)
self.old_field_keys.add((app_label, model_name, field_name))
old_field_keys.add((app_label, model_name, field_name))
self.renamed_fields[
app_label, model_name, field_name
] = rem_field_name
break
def generate_renamed_fields(self):
"""Generate RenameField operations."""
for (
rem_app_label,
rem_model_name,
rem_db_column,
rem_field_name,
app_label,
model_name,
field,
field_name,
) in self.renamed_operations:
# A db_column mismatch requires a prior noop AlterField for the
# subsequent RenameField to be a noop on attempts at preserving the
# old name.
if rem_db_column != field.db_column:
altered_field = field.clone()
altered_field.name = rem_field_name
self.add_operation(
app_label,
operations.AlterField(
model_name=model_name,
name=rem_field_name,
field=altered_field,
),
)
self.add_operation(
app_label,
operations.RenameField(
model_name=model_name,
old_name=rem_field_name,
new_name=field_name,
),
)
self.old_field_keys.remove((rem_app_label, rem_model_name, rem_field_name))
self.old_field_keys.add((app_label, model_name, field_name))
def generate_added_fields(self):
"""Make AddField operations."""
for app_label, model_name, field_name in sorted(