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Factorized create_index_sql expression

This commit is contained in:
Claude Paroz 2014-06-20 14:32:11 +02:00
parent e1424b2370
commit 6072f17d09
1 changed files with 18 additions and 40 deletions
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58
django/db/backends/schema.py
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@ -225,14 +225,7 @@ class BaseDatabaseSchemaEditor(object):
params.extend(extra_params)
# Indexes
if field.db_index and not field.unique:
self.deferred_sql.append(
self.sql_create_index % {
"name": self._create_index_name(model, [field.column], suffix=""),
"table": self.quote_name(model._meta.db_table),
"columns": self.quote_name(field.column),
"extra": "",
}
)
self.deferred_sql.append(self._create_index_sql(model, [field], suffix=""))
# FK
if field.rel and field.db_constraint:
to_table = field.rel.to._meta.db_table
@ -277,14 +270,9 @@ class BaseDatabaseSchemaEditor(object):
}
self.execute(sql, params)
# Add any index_togethers
for fields in model._meta.index_together:
columns = [model._meta.get_field_by_name(field)[0].column for field in fields]
self.execute(self.sql_create_index % {
"table": self.quote_name(model._meta.db_table),
"name": self._create_index_name(model, columns, suffix="_idx"),
"columns": ", ".join(self.quote_name(column) for column in columns),
"extra": "",
})
for field_names in model._meta.index_together:
fields = [model._meta.get_field_by_name(field)[0] for field in field_names]
self.execute(self._create_index_sql(model, fields, suffix="_idx"))
# Make M2M tables
for field in model._meta.local_many_to_many:
if field.rel.through._meta.auto_created:
@ -362,14 +350,9 @@ class BaseDatabaseSchemaEditor(object):
},
)
# Created indexes
for fields in news.difference(olds):
columns = [model._meta.get_field_by_name(field)[0].column for field in fields]
self.execute(self.sql_create_index % {
"table": self.quote_name(model._meta.db_table),
"name": self._create_index_name(model, columns, suffix="_idx"),
"columns": ", ".join(self.quote_name(column) for column in columns),
"extra": "",
})
for field_names in news.difference(olds):
fields = [model._meta.get_field_by_name(field)[0] for field in field_names]
self.execute(self._create_index_sql(model, fields, suffix="_idx"))
def alter_db_table(self, model, old_db_table, new_db_table):
"""
@ -429,14 +412,7 @@ class BaseDatabaseSchemaEditor(object):
self.execute(sql)
# Add an index, if required
if field.db_index and not field.unique:
self.deferred_sql.append(
self.sql_create_index % {
"name": self._create_index_name(model, [field.column], suffix=""),
"table": self.quote_name(model._meta.db_table),
"columns": self.quote_name(field.column),
"extra": "",
}
)
self.deferred_sql.append(self._create_index_sql(model, [field]))
# Add any FK constraints later
if field.rel and self.connection.features.supports_foreign_keys and field.db_constraint:
to_table = field.rel.to._meta.db_table
@ -706,14 +682,7 @@ class BaseDatabaseSchemaEditor(object):
if (not old_field.db_index and new_field.db_index and
not new_field.unique and not
(not old_field.unique and new_field.unique)):
self.execute(
self.sql_create_index % {
"table": self.quote_name(model._meta.db_table),
"name": self._create_index_name(model, [new_field.column], suffix="_uniq"),
"columns": self.quote_name(new_field.column),
"extra": "",
}
)
self.execute(self._create_index_sql(model, [new_field], suffix="_uniq"))
# Type alteration on primary key? Then we need to alter the column
# referring to us.
rels_to_update = []
@ -883,6 +852,15 @@ class BaseDatabaseSchemaEditor(object):
index_name = "D%s" % index_name[:-1]
return index_name
def _create_index_sql(self, model, fields, suffix=""):
columns = [field.column for field in fields]
return self.sql_create_index % {
"table": self.quote_name(model._meta.db_table),
"name": self._create_index_name(model, columns, suffix=suffix),
"columns": ", ".join(self.quote_name(column) for column in columns),
"extra": "",
}
def _constraint_names(self, model, column_names=None, unique=None,
primary_key=None, index=None, foreign_key=None,
check=None):