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Code Issues 32 Releases Wiki Activity

Refactored the way save() works so that non-integer primary keys are now possible. custom_pk unit tests (from [458]) now pass. Refs #81.

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git-svn-id: http://code.djangoproject.com/svn/django/trunk@462 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Adrian Holovaty
2005-08-10 05:08:27 +00:00
parent 63e1f3d39c
commit 4622e0ff82
2 changed files with 42 additions and 41 deletions
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60
django/core/meta/__init__.py
View File

@@ -208,6 +208,14 @@ class Options:
if self.pk is None:
self.fields.insert(0, AutoField('id', 'ID', primary_key=True))
self.pk = self.fields[0]
# Cache whether this has an AutoField.
self.has_auto_field = False
for f in self.fields:
is_auto = isinstance(f, AutoField)
if is_auto and self.has_auto_field:
raise AssertionError, "A model can't have more than one AutoField."
elif is_auto:
self.has_auto_field = True
def __repr__(self):
return '<Options for %s>' % self.module_name
@@ -717,37 +725,27 @@ def method_save(opts, self):
self._pre_save()
non_pks = [f for f in opts.fields if not f.primary_key]
cursor = db.db.cursor()
add = not bool(getattr(self, opts.pk.name))
for f in non_pks:
f.pre_save(self, getattr(self, f.name), add)
db_values = [f.get_db_prep_save(getattr(self, f.name)) for f in non_pks]
# OneToOne objects are a special case because there's no AutoField, and the
# primary key field is set manually.
if isinstance(opts.pk.rel, OneToOne):
cursor.execute("UPDATE %s SET %s WHERE %s=%%s" % \
(opts.db_table, ','.join(['%s=%%s' % f.name for f in non_pks]),
opts.pk.name), db_values + [getattr(self, opts.pk.name)])
if cursor.rowcount == 0: # If nothing was updated, add the record.
field_names = [f.name for f in opts.fields]
placeholders = ['%s'] * len(field_names)
cursor.execute("INSERT INTO %s (%s) VALUES (%s)" % \
(opts.db_table, ','.join(field_names), ','.join(placeholders)),
[f.get_db_prep_save(getattr(self, f.name)) for f in opts.fields])
else:
if not add:
cursor.execute("UPDATE %s SET %s WHERE %s=%%s" % \
(opts.db_table, ','.join(['%s=%%s' % f.name for f in non_pks]),
opts.pk.name), db_values + [getattr(self, opts.pk.name)])
else:
field_names = [f.name for f in non_pks]
placeholders = ['%s'] * len(field_names)
if opts.order_with_respect_to:
field_names.append('_order')
placeholders.append('(SELECT COUNT(*) FROM %s WHERE %s = %%s)' % \
(opts.db_table, opts.order_with_respect_to.name))
db_values.append(getattr(self, opts.order_with_respect_to.name))
cursor.execute("INSERT INTO %s (%s) VALUES (%s)" % \
(opts.db_table, ','.join(field_names), ','.join(placeholders)), db_values)
# First, try an UPDATE. If that doesn't update anything, do an INSERT.
pk_set = bool(getattr(self, opts.pk.name))
if pk_set:
db_values = [f.get_db_prep_save(f.pre_save(getattr(self, f.name), False)) for f in non_pks]
cursor.execute("UPDATE %s SET %s WHERE %s=%%s" % (opts.db_table,
','.join(['%s=%%s' % f.name for f in non_pks]), opts.pk.name),
db_values + [getattr(self, opts.pk.name)])
if not pk_set or cursor.rowcount == 0:
field_names = [f.name for f in opts.fields if not isinstance(f, AutoField)]
placeholders = ['%s'] * len(field_names)
db_values = [f.get_db_prep_save(f.pre_save(getattr(self, f.name), True)) for f in opts.fields if not isinstance(f, AutoField)]
if opts.order_with_respect_to:
field_names.append('_order')
# TODO: This assumes the database supports subqueries.
placeholders.append('(SELECT COUNT(*) FROM %s WHERE %s = %%s)' % \
(opts.db_table, opts.order_with_respect_to.name))
db_values.append(getattr(self, opts.order_with_respect_to.name))
cursor.execute("INSERT INTO %s (%s) VALUES (%s)" % (opts.db_table,
','.join(field_names), ','.join(placeholders)), db_values)
if opts.has_auto_field:
setattr(self, opts.pk.name, db.get_last_insert_id(cursor, opts.db_table, opts.pk.name))
db.db.commit()
# Run any post-save hooks.

23
django/core/meta/fields.py
View File

@@ -82,12 +82,9 @@ class Field(object):
else:
self.db_index = db_index
def pre_save(self, obj, value, add):
"""
Hook for altering the object obj based on the value of this field and
and on the add/change status.
"""
pass
def pre_save(self, value, add):
"Returns field's value just before saving."
return value
def get_db_prep_save(self, value):
"Returns field's value prepared for saving into a database."
@@ -236,6 +233,10 @@ class Field(object):
class AutoField(Field):
empty_strings_allowed = False
def __init__(self, *args, **kwargs):
assert kwargs.get('primary_key', False) is True, "%ss must have primary_key=True." % self.__class__.__name__
Field.__init__(self, *args, **kwargs)
def get_manipulator_fields(self, opts, manipulator, change, name_prefix='', rel=False):
if not rel:
return [] # Don't add a FormField unless it's in a related context.
@@ -280,9 +281,10 @@ class DateField(Field):
value = str(value)
return Field.get_db_prep_lookup(self, lookup_type, value)
def pre_save(self, obj, value, add):
def pre_save(self, value, add):
if self.auto_now or (self.auto_now_add and add):
setattr(obj, self.name, datetime.datetime.now())
return datetime.datetime.now()
return value
def get_db_prep_save(self, value):
# Casts dates into string format for entry into database.
@@ -483,9 +485,10 @@ class TimeField(Field):
value = str(value)
return Field.get_db_prep_lookup(self, lookup_type, value)
def pre_save(self, obj, value, add):
def pre_save(self, value, add):
if self.auto_now or (self.auto_now_add and add):
setattr(obj, self.name, datetime.datetime.now().time())
return datetime.datetime.now().time()
return value
def get_db_prep_save(self, value):
# Casts dates into string format for entry into database.