Update get_constraints with better comments

This commit is contained in:
Andrew Godwin 2013-08-10 23:58:12 +01:00
parent d5a7a3d6a8
commit 7702819441
2 changed files with 16 additions and 5 deletions

View File

@ -1328,9 +1328,20 @@ class BaseDatabaseIntrospection(object):
def get_constraints(self, cursor, table_name):
"""
Returns {'cnname': {'columns': set(columns), 'primary_key': bool, 'unique': bool}}
Both single- and multi-column constraints are introspected.
Retrieves any constraints or keys (unique, pk, fk, check, index)
across one or more columns.
Returns a dict mapping constraint names to their attributes,
where attributes is a dict with keys:
* columns: List of columns this covers
* primary_key: True if primary key, False otherwise
* unique: True if this is a unique constraint, False otherwise
* foreign_key: (table, column) of target, or None
* check: True if check constraint, False otherwise
* index: True if index, False otherwise.
Some backends may return special constraint names that don't exist
if they don't name constraints of a certain type (e.g. SQLite)
"""
raise NotImplementedError

View File

@ -169,7 +169,7 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
"columns": [],
"primary_key": False,
"unique": False,
"foreign_key": False,
"foreign_key": None,
"check": True,
"index": False,
}
@ -197,7 +197,7 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
"columns": list(columns),
"primary_key": primary,
"unique": unique,
"foreign_key": False,
"foreign_key": None,
"check": False,
"index": True,
}