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Fixed #26841 -- Avoid remake tables for altering togethers in sqlite3 (#6888) 

alter_index_together and alter_unique_together no more use _remake_table method in sqlite3
This commit is contained in:
akki 2016-07-06 13:33:47 +05:30 committed by Claude Paroz
parent 6d61ec0e1a
commit 2960e3a3a7
1 changed files with 11 additions and 31 deletions
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42
django/db/backends/sqlite3/schema.py
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@ -67,8 +67,7 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
else:
raise ValueError("Cannot quote parameter value %r of type %s" % (value, type(value)))
def _remake_table(self, model, create_fields=[], delete_fields=[], alter_fields=[], override_uniques=None,
override_indexes=None):
def _remake_table(self, model, create_fields=[], delete_fields=[], alter_fields=[]):
"""
Shortcut to transform a model from old_model into new_model
@ -143,26 +142,24 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
# Work out the new value of unique_together, taking renames into
# account
if override_uniques is None:
override_uniques = [
[rename_mapping.get(n, n) for n in unique]
for unique in model._meta.unique_together
]
unique_together = [
[rename_mapping.get(n, n) for n in unique]
for unique in model._meta.unique_together
]
# Work out the new value for index_together, taking renames into
# account
if override_indexes is None:
override_indexes = [
[rename_mapping.get(n, n) for n in index]
for index in model._meta.index_together
]
index_together = [
[rename_mapping.get(n, n) for n in index]
for index in model._meta.index_together
]
# Construct a new model for the new state
meta_contents = {
'app_label': model._meta.app_label,
'db_table': model._meta.db_table,
'unique_together': override_uniques,
'index_together': override_indexes,
'unique_together': unique_together,
'index_together': index_together,
'apps': apps,
}
meta = type("Meta", tuple(), meta_contents)
@ -254,22 +251,6 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
# Alter by remaking table
self._remake_table(model, alter_fields=[(old_field, new_field)])
def alter_index_together(self, model, old_index_together, new_index_together):
"""
Deals with a model changing its index_together.
Note: The input index_togethers must be doubly-nested, not the single-
nested ["foo", "bar"] format.
"""
self._remake_table(model, override_indexes=new_index_together)
def alter_unique_together(self, model, old_unique_together, new_unique_together):
"""
Deals with a model changing its unique_together.
Note: The input unique_togethers must be doubly-nested, not the single-
nested ["foo", "bar"] format.
"""
self._remake_table(model, override_uniques=new_unique_together)
def _alter_many_to_many(self, model, old_field, new_field, strict):
"""
Alters M2Ms to repoint their to= endpoints.
@ -284,7 +265,6 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
old_field.remote_field.through._meta.get_field(old_field.m2m_reverse_field_name()),
new_field.remote_field.through._meta.get_field(new_field.m2m_reverse_field_name()),
)],
override_uniques=(new_field.m2m_field_name(), new_field.m2m_reverse_field_name()),
)
return