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PostgreSQL add/drop index/unique

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This commit is contained in:
Adam Ciarciński
2020-08-06 17:45:56 +02:00
parent 1263c6f735
commit 1b440477a2
3 changed files with 39 additions and 2 deletions
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27
aerich/ddl/postgres/__init__.py
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@@ -1,4 +1,4 @@
from typing import Type
from typing import List, Type
from tortoise import Model
from tortoise.backends.asyncpg.schema_generator import AsyncpgSchemaGenerator
@@ -10,6 +10,12 @@ from aerich.ddl import BaseDDL
class PostgresDDL(BaseDDL):
schema_generator_cls = AsyncpgSchemaGenerator
DIALECT = AsyncpgSchemaGenerator.DIALECT
_ADD_INDEX_TEMPLATE = 'CREATE INDEX "{index_name}" ON "{table_name}" ({column_names})'
_ADD_UNIQUE_TEMPLATE = (
'ALTER TABLE "{table_name}" ADD CONSTRAINT "{index_name}" UNIQUE ({column_names})'
)
_DROP_INDEX_TEMPLATE = 'DROP INDEX "{index_name}"'
_DROP_UNIQUE_TEMPLATE = 'ALTER TABLE "{table_name}" DROP CONSTRAINT "{index_name}"'
_ALTER_DEFAULT_TEMPLATE = 'ALTER TABLE "{table_name}" ALTER COLUMN "{column}" {default}'
_ALTER_NULL_TEMPLATE = 'ALTER TABLE "{table_name}" ALTER COLUMN "{column}" {set_drop} NOT NULL'
_MODIFY_COLUMN_TEMPLATE = 'ALTER TABLE "{table_name}" ALTER COLUMN "{column}" TYPE {datatype}'
@@ -41,6 +47,25 @@ class PostgresDDL(BaseDDL):
datatype=field_object.get_for_dialect(self.DIALECT, "SQL_TYPE"),
)
def add_index(self, model: "Type[Model]", field_names: List[str], unique=False):
template = self._ADD_UNIQUE_TEMPLATE if unique else self._ADD_INDEX_TEMPLATE
return template.format(
index_name=self.schema_generator._generate_index_name(
"uid" if unique else "idx", model, field_names
),
table_name=model._meta.db_table,
column_names=", ".join([self.schema_generator.quote(f) for f in field_names]),
)
def drop_index(self, model: "Type[Model]", field_names: List[str], unique=False):
template = self._DROP_UNIQUE_TEMPLATE if unique else self._DROP_INDEX_TEMPLATE
return template.format(
index_name=self.schema_generator._generate_index_name(
"uid" if unique else "idx", model, field_names
),
table_name=model._meta.db_table,
)
def set_comment(self, model: "Type[Model]", field_object: Field):
db_table = model._meta.db_table
return self._SET_COMMENT_TEMPLATE.format(