def test_get_migration_classes(self):
app = self.create_test_app()
# Can't use vanilla import, modules beginning with numbers aren't in grammar
M1 = __import__("fakeapp.migrations.0001_spam", {}, {}, ["Migration"]).Migration
M2 = __import__("fakeapp.migrations.0002_eggs", {}, {}, ["Migration"]).Migration
M3 = __import__("fakeapp.migrations.0003_alter_spam", {}, {}, ["Migration"]).Migration
self.assertEqual([M1, M2, M3], list(migration.get_migration_classes(app)))
def test_get_migration_classes(self):
app = self.create_test_app()
# Can't use vanilla import, modules beginning with numbers aren't in grammar
M1 = __import__("fakeapp.migrations.0001_spam", {}, {}, ['Migration']).Migration
M2 = __import__("fakeapp.migrations.0002_eggs", {}, {}, ['Migration']).Migration
M3 = __import__("fakeapp.migrations.0003_alter_spam", {}, {}, ['Migration']).Migration
self.assertEqual(
[M1, M2, M3],
list(migration.get_migration_classes(app)),
)
def handle(self, app=None, name="", added_model_list=None, added_field_list=None, initial=False, freeze_list=None, auto=False, stdout=False, **options):
# Any supposed lists that are None become empty lists
added_model_list = added_model_list or []
added_field_list = added_field_list or []
# --stdout means name = -
if stdout:
name = "-"
# Make sure options are compatable
if initial and (added_model_list or added_field_list or auto):
print "You cannot use --initial and other options together"
print self.usage_str
return
if auto and (added_model_list or added_field_list or initial):
print "You cannot use --auto and other options together"
print self.usage_str
return
# specify the default name 'initial' if a name wasn't specified and we're
# doing a migration for an entire app
if not name and initial:
name = 'initial'
# if not name, there's an error
if not name:
print "You must name this migration"
print self.usage_str
return
if not app:
print "Please provide an app in which to create the migration."
print self.usage_str
return
# Make sure the app is short form
app = app.split(".")[-1]
# See if the app exists
app_models_module = models.get_app(app)
if not app_models_module:
print "App '%s' doesn't seem to exist, isn't in INSTALLED_APPS, or has no models." % app
print self.usage_str
return
# If they've set SOUTH_AUTO_FREEZE_APP = True (or not set it - defaults to True)
if not hasattr(settings, 'SOUTH_AUTO_FREEZE_APP') or settings.SOUTH_AUTO_FREEZE_APP:
if freeze_list and app not in freeze_list:
freeze_list += [app]
else:
freeze_list = [app]
# Make the migrations directory if it's not there
app_module_path = app_models_module.__name__.split('.')[0:-1]
try:
app_module = __import__('.'.join(app_module_path), {}, {}, [''])
except ImportError:
print "Couldn't find path to App '%s'." % app
print self.usage_str
return
migrations_dir = os.path.join(
os.path.dirname(app_module.__file__),
"migrations",
)
# Make sure there's a migrations directory and __init__.py
if not os.path.isdir(migrations_dir):
print "Creating migrations directory at '%s'..." % migrations_dir
os.mkdir(migrations_dir)
init_path = os.path.join(migrations_dir, "__init__.py")
if not os.path.isfile(init_path):
# Touch the init py file
print "Creating __init__.py in '%s'..." % migrations_dir
open(init_path, "w").close()
# See what filename is next in line. We assume they use numbers.
migrations = migration.get_migration_names(migration.get_app(app))
highest_number = 0
for migration_name in migrations:
try:
number = int(migration_name.split("_")[0])
highest_number = max(highest_number, number)
except ValueError:
pass
# Make the new filename
new_filename = "%04i%s_%s.py" % (
highest_number + 1,
"".join([random.choice(string.letters.lower()) for i in range(0)]), # Possible random stuff insertion
name,
)
# Find the source file encoding, using PEP 0263's method
encoding = None
first_two_lines = inspect.getsourcelines(app_models_module)[0][:2]
for line in first_two_lines:
if re.search("coding[:=]\s*([-\w.]+)", line):
encoding = line
# Initialise forwards, backwards and models to blank things
forwards = ""
backwards = ""
frozen_models = {} # Frozen models, used by the Fake ORM
complete_apps = set() # Apps that are completely frozen - useable for diffing.
# Sets of actions
added_models = set()
deleted_models = [] # Special: contains instances _not_ string keys
added_fields = set()
deleted_fields = [] # Similar to deleted_models
changed_fields = [] # (mkey, fname, old_def, new_def)
added_uniques = set() # (mkey, field_names)
deleted_uniques = set() # (mkey, field_names)
# --initial means 'add all models in this app'.
if initial:
for model in models.get_models(app_models_module):
added_models.add("%s.%s" % (app, model._meta.object_name))
# Added models might be 'model' or 'app.model'.
for modelname in added_model_list:
if "." in modelname:
added_models.add(modelname)
else:
added_models.add("%s.%s" % (app, modelname))
# Fields need translating from "model.field" to (app.model, field)
for fielddef in added_field_list:
try:
modelname, fieldname = fielddef.split(".", 1)
except ValueError:
print "The field specification '%s' is not in modelname.fieldname format." % fielddef
else:
added_fields.add(("%s.%s" % (app, modelname), fieldname))
# Add anything frozen (I almost called the dict Iceland...)
if freeze_list:
for item in freeze_list:
if "." in item:
# It's a specific model
app_name, model_name = item.split(".", 1)
model = models.get_model(app_name, model_name)
if model is None:
print "Cannot find the model '%s' to freeze it." % item
print self.usage_str
return
frozen_models[model] = None
else:
# Get everything in an app!
frozen_models.update(dict([(x, None) for x in models.get_models(models.get_app(item))]))
complete_apps.add(item.split(".")[-1])
# For every model in the freeze list, add in frozen dependencies
for model in list(frozen_models):
frozen_models.update(model_dependencies(model))
### Automatic Detection ###
if auto:
# Get the last migration for this app
last_models = None
app_module = migration.get_app(app)
if app_module is None:
print "You cannot use automatic detection on the first migration of an app. Try --initial instead."
else:
migrations = list(migration.get_migration_classes(app_module))
if not migrations:
print "You cannot use automatic detection on the first migration of an app. Try --initial instead."
else:
if hasattr(migrations[-1], "complete_apps") and \
app in migrations[-1].complete_apps:
last_models = migrations[-1].models
last_orm = migrations[-1].orm
else:
print "You cannot use automatic detection, since the previous migration does not have this whole app frozen.\nEither make migrations using '--freeze %s' or set 'SOUTH_AUTO_FREEZE_APP = True' in your settings.py." % app
# Right, did we manage to get the last set of models?
if last_models is None:
print self.usage_str
return
new = dict([
(model_key(model), prep_for_freeze(model))
for model in models.get_models(app_models_module)
if (
not getattr(model._meta, "proxy", False) and \
getattr(model._meta, "managed", True) and \
not getattr(model._meta, "abstract", False)
)
])
# And filter other apps out of the old
old = dict([
(key, fields)
for key, fields in last_models.items()
if key.split(".", 1)[0] == app
])
am, dm, cm, af, df, cf, afu, dfu = models_diff(old, new)
# For models that were there before and after, do a meta diff
was_meta_change = False
for mkey in cm:
au, du = meta_diff(old[mkey].get("Meta", {}), new[mkey].get("Meta", {}))
for entry in au:
added_uniques.add((mkey, entry))
was_meta_change = True
for entry in du:
deleted_uniques.add((mkey, entry, last_orm[mkey]))
was_meta_change = True
if not (am or dm or af or df or cf or afu or dfu or was_meta_change):
print "Nothing seems to have changed."
return
# Add items to the todo lists
added_models.update(am)
added_fields.update(af)
changed_fields.extend(cf)
# Deleted models are from the past, and so we use instances instead.
for mkey in dm:
model = last_orm[mkey]
fields = last_models[mkey]
if "Meta" in fields:
del fields['Meta']
deleted_models.append((model, fields, last_models))
# For deleted fields, we tag the instance on the end too
for mkey, fname in df:
deleted_fields.append((
mkey,
fname,
last_orm[mkey]._meta.get_field_by_name(fname)[0],
last_models[mkey][fname],
last_models,
))
# Uniques need merging
added_uniques = added_uniques.union(afu)
for mkey, entry in dfu:
deleted_uniques.add((mkey, entry, last_orm[mkey]))
### Added model ###
for mkey in added_models:
print " + Added model '%s'" % (mkey,)
model = model_unkey(mkey)
# Add the model's dependencies to the frozens
frozen_models.update(model_dependencies(model))
# Get the field definitions
fields = modelsinspector.get_model_fields(model)
# Turn the (class, args, kwargs) format into a string
fields = triples_to_defs(app, model, fields)
# Make the code
forwards += CREATE_TABLE_SNIPPET % (
model._meta.object_name,
model._meta.db_table,
"\n ".join(["('%s', orm[%r])," % (fname, mkey + ":" + fname) for fname, fdef in fields.items()]),
model._meta.app_label,
model._meta.object_name,
)
# And the backwards code
backwards += DELETE_TABLE_SNIPPET % (
model._meta.object_name,
model._meta.db_table
)
# Now add M2M fields to be done
for field in model._meta.local_many_to_many:
added_fields.add((mkey, field.attname))
# And unique_togethers to be added
for ut in model._meta.unique_together:
added_uniques.add((mkey, tuple(ut)))
### Added fields ###
for mkey, field_name in added_fields:
# Get the model
model = model_unkey(mkey)
# Get the field
try:
field = model._meta.get_field(field_name)
except FieldDoesNotExist:
print "Model '%s' doesn't have a field '%s'" % (mkey, field_name)
return
# ManyToMany fields need special attention.
if isinstance(field, models.ManyToManyField):
if not field.rel.through: # Bug #120
# Add a frozen model for each side
frozen_models[model] = None
frozen_models[field.rel.to] = None
# And a field defn, that's actually a table creation
forwards += CREATE_M2MFIELD_SNIPPET % (
model._meta.object_name,
field.name,
field.m2m_db_table(),
field.m2m_column_name()[:-3], # strip off the '_id' at the end
poss_ormise(app, model, model._meta.object_name),
field.m2m_reverse_name()[:-3], # strip off the '_id' at the ned
poss_ormise(app, field.rel.to, field.rel.to._meta.object_name)
)
backwards += DELETE_M2MFIELD_SNIPPET % (
model._meta.object_name,
field.name,
field.m2m_db_table()
)
print " + Added M2M '%s.%s'" % (mkey, field_name)
continue
# GenericRelations need ignoring
if isinstance(field, GenericRelation):
continue
print " + Added field '%s.%s'" % (mkey, field_name)
# Add any dependencies
frozen_models.update(field_dependencies(field))
# Work out the definition
triple = remove_useless_attributes(
modelsinspector.get_model_fields(model)[field_name])
field_definition = make_field_constructor(app, field, triple)
forwards += CREATE_FIELD_SNIPPET % (
model._meta.object_name,
field.name,
model._meta.db_table,
field.name,
"orm[%r]" % (mkey + ":" + field.name),
)
backwards += DELETE_FIELD_SNIPPET % (
model._meta.object_name,
field.name,
model._meta.db_table,
field.column,
)
### Deleted fields ###
for mkey, field_name, field, triple, last_models in deleted_fields:
print " - Deleted field '%s.%s'" % (mkey, field_name)
# Get the model
model = model_unkey(mkey)
# ManyToMany fields need special attention.
if isinstance(field, models.ManyToManyField):
# And a field defn, that's actually a table deletion
forwards += DELETE_M2MFIELD_SNIPPET % (
model._meta.object_name,
field.name,
field.m2m_db_table()
)
backwards += CREATE_M2MFIELD_SNIPPET % (
model._meta.object_name,
field.name,
field.m2m_db_table(),
field.m2m_column_name()[:-3], # strip off the '_id' at the end
poss_ormise(app, model, model._meta.object_name),
field.m2m_reverse_name()[:-3], # strip off the '_id' at the ned
poss_ormise(app, field.rel.to, field.rel.to._meta.object_name)
)
continue
# Work out the definition
triple = remove_useless_attributes(triple)
field_definition = make_field_constructor(app, field, triple)
forwards += DELETE_FIELD_SNIPPET % (
model._meta.object_name,
field.name,
model._meta.db_table,
field.column,
)
backwards += CREATE_FIELD_SNIPPET % (
model._meta.object_name,
field.name,
model._meta.db_table,
field.name,
"orm[%r]" % (mkey + ":" + field.name),
)
### Deleted model ###
for model, fields, last_models in deleted_models:
print " - Deleted model '%s.%s'" % (model._meta.app_label,model._meta.object_name)
# Turn the (class, args, kwargs) format into a string
fields = triples_to_defs(app, model, fields)
# Make the code
forwards += DELETE_TABLE_SNIPPET % (
model._meta.object_name,
model._meta.db_table
)
# And the backwards code
backwards += CREATE_TABLE_SNIPPET % (
model._meta.object_name,
model._meta.db_table,
"\n ".join(["('%s', orm[%r])," % (fname, mkey + ":" + fname) for fname, fdef in fields.items()]),
model._meta.app_label,
model._meta.object_name,
)
### Changed fields ###
for mkey, field_name, old_triple, new_triple in changed_fields:
model = model_unkey(mkey)
old_def = triples_to_defs(app, model, {
field_name: old_triple,
})[field_name]
new_def = triples_to_defs(app, model, {
field_name: new_triple,
})[field_name]
# We need to create the field, to see if it needs _id, or if it's an M2M
field = model._meta.get_field_by_name(field_name)[0]
if hasattr(field, "m2m_db_table"):
# See if anything has ACTUALLY changed
if old_triple[1] != new_triple[1]:
print " ! Detected change to the target model of M2M field '%s.%s'. South can't handle this; leaving this change out." % (mkey, field_name)
continue
print " ~ Changed field '%s.%s'." % (mkey, field_name)
forwards += CHANGE_FIELD_SNIPPET % (
model._meta.object_name,
field_name,
new_def,
model._meta.db_table,
field.get_attname(),
"orm[%r]" % (mkey + ":" + field.name),
)
backwards += CHANGE_FIELD_SNIPPET % (
model._meta.object_name,
field_name,
old_def,
model._meta.db_table,
field.get_attname(),
"orm[%r]" % (mkey + ":" + field.name),
)
### Added unique_togethers ###
for mkey, ut in added_uniques:
model = model_unkey(mkey)
if len(ut) == 1:
print " + Added unique for %s on %s." % (", ".join(ut), model._meta.object_name)
else:
print " + Added unique_together for [%s] on %s." % (", ".join(ut), model._meta.object_name)
cols = [get_field_column(model, f) for f in ut]
forwards += CREATE_UNIQUE_SNIPPET % (
", ".join(ut),
model._meta.object_name,
model._meta.db_table,
cols,
)
backwards = DELETE_UNIQUE_SNIPPET % (
", ".join(ut),
model._meta.object_name,
model._meta.db_table,
cols,
) + backwards
### Deleted unique_togethers ###
for mkey, ut, model in deleted_uniques:
if len(ut) == 1:
print " - Deleted unique for %s on %s." % (", ".join(ut), model._meta.object_name)
else:
print " - Deleted unique_together for [%s] on %s." % (", ".join(ut), model._meta.object_name)
cols = [get_field_column(model, f) for f in ut]
forwards = DELETE_UNIQUE_SNIPPET % (
", ".join(ut),
model._meta.object_name,
model._meta.db_table,
cols,
) + forwards
backwards += CREATE_UNIQUE_SNIPPET % (
", ".join(ut),
model._meta.object_name,
model._meta.db_table,
cols,
)
# Default values for forwards/backwards
if (not forwards) and (not backwards):
forwards = '"Write your forwards migration here"'
backwards = '"Write your backwards migration here"'
all_models = {}
# Fill out frozen model definitions
for model, last_models in frozen_models.items():
all_models[model_key(model)] = prep_for_freeze(model, last_models)
# Do some model cleanup, and warnings
for modelname, model in all_models.items():
for fieldname, fielddef in model.items():
# Remove empty-after-cleaning Metas.
if fieldname == "Meta" and not fielddef:
del model['Meta']
# Warn about undefined fields
elif fielddef is None:
print "WARNING: Cannot get definition for '%s' on '%s'. Please edit the migration manually to define it, or add the south_field_triple method to it." % (
fieldname,
modelname,
)
model[fieldname] = FIELD_NEEDS_DEF_SNIPPET
# So, what's in this file, then?
file_contents = MIGRATION_SNIPPET % (
encoding or "", '.'.join(app_module_path),
forwards,
backwards,
pprint_frozen_models(all_models),
complete_apps and "complete_apps = [%s]" % (", ".join(map(repr, complete_apps))) or ""
)
# - is a special name which means 'print to stdout'
if name == "-":
print file_contents
# Write the migration file if the name isn't -
else:
fp = open(os.path.join(migrations_dir, new_filename), "w")
fp.write(file_contents)
fp.close()
print "Created %s." % new_filename
def handle(self,
app=None,
name="",
added_model_list=None,
added_field_list=None,
initial=False,
freeze_list=None,
auto=False,
**options):
# Any supposed lists that are None become empty lists
added_model_list = added_model_list or []
added_field_list = added_field_list or []
# Make sure options are compatable
if initial and (added_model_list or added_field_list or auto):
print "You cannot use --initial and other options together"
return
if auto and (added_model_list or added_field_list or initial):
print "You cannot use --auto and other options together"
return
# specify the default name 'initial' if a name wasn't specified and we're
# doing a migration for an entire app
if not name and initial:
name = 'initial'
# if not name, there's an error
if not name:
print "You must name this migration"
return
if not app:
print "Please provide an app in which to create the migration."
return
# Make sure the app is short form
app = app.split(".")[-1]
# See if the app exists
app_models_module = models.get_app(app)
if not app_models_module:
print "App '%s' doesn't seem to exist, isn't in INSTALLED_APPS, or has no models." % app
return
# If they've set SOUTH_AUTO_FREEZE_APP = True (or not set it - defaults to True)
if not hasattr(
settings,
'SOUTH_AUTO_FREEZE_APP') or settings.SOUTH_AUTO_FREEZE_APP:
if freeze_list and app not in freeze_list:
freeze_list += [app]
else:
freeze_list = [app]
# Make the migrations directory if it's not there
app_module_path = app_models_module.__name__.split('.')[0:-1]
try:
app_module = __import__('.'.join(app_module_path), {}, {}, [''])
except ImportError:
print "Couldn't find path to App '%s'." % app
return
migrations_dir = os.path.join(
os.path.dirname(app_module.__file__),
"migrations",
)
# Make sure there's a migrations directory and __init__.py
if not os.path.isdir(migrations_dir):
print "Creating migrations directory at '%s'..." % migrations_dir
os.mkdir(migrations_dir)
init_path = os.path.join(migrations_dir, "__init__.py")
if not os.path.isfile(init_path):
# Touch the init py file
print "Creating __init__.py in '%s'..." % migrations_dir
open(init_path, "w").close()
# See what filename is next in line. We assume they use numbers.
migrations = migration.get_migration_names(migration.get_app(app))
highest_number = 0
for migration_name in migrations:
try:
number = int(migration_name.split("_")[0])
highest_number = max(highest_number, number)
except ValueError:
pass
# Make the new filename
new_filename = "%04i%s_%s.py" % (
highest_number + 1,
"".join([random.choice(string.letters.lower())
for i in range(0)]), # Possible random stuff insertion
name,
)
# Find the source file encoding, using PEP 0263's method
encoding = None
first_two_lines = inspect.getsourcelines(app_models_module)[0][:2]
for line in first_two_lines:
if re.search("coding[:=]\s*([-\w.]+)", line):
encoding = line
# Initialise forwards, backwards and models to blank things
forwards = ""
backwards = ""
frozen_models = {} # Frozen models, used by the Fake ORM
stub_models = {
} # Frozen models, but only enough for relation ends (old mock models)
complete_apps = set(
) # Apps that are completely frozen - useable for diffing.
# Sets of actions
added_models = set()
deleted_models = [] # Special: contains instances _not_ string keys
added_fields = set()
deleted_fields = [] # Similar to deleted_models
changed_fields = [] # (mkey, fname, old_def, new_def)
added_uniques = set() # (mkey, field_names)
deleted_uniques = set() # (mkey, field_names)
# --initial means 'add all models in this app'.
if initial:
for model in models.get_models(app_models_module):
added_models.add("%s.%s" % (app, model._meta.object_name))
# Added models might be 'model' or 'app.model'.
for modelname in added_model_list:
if "." in modelname:
added_models.add(modelname)
else:
added_models.add("%s.%s" % (app, modelname))
# Fields need translating from "model.field" to (app.model, field)
for fielddef in added_field_list:
try:
modelname, fieldname = fielddef.split(".", 1)
except ValueError:
print "The field specification '%s' is not in modelname.fieldname format." % fielddef
else:
added_fields.add(("%s.%s" % (app, modelname), fieldname))
# Add anything frozen (I almost called the dict Iceland...)
if freeze_list:
for item in freeze_list:
if "." in item:
# It's a specific model
app_name, model_name = item.split(".", 1)
model = models.get_model(app_name, model_name)
if model is None:
print "Cannot find the model '%s' to freeze it." % item
return
frozen_models[model] = None
else:
# Get everything in an app!
frozen_models.update(
dict([(x, None)
for x in models.get_models(models.get_app(item))
]))
complete_apps.add(item.split(".")[-1])
# For every model in the freeze list, add in dependency stubs
for model in frozen_models:
stub_models.update(model_dependencies(model))
### Automatic Detection ###
if auto:
# Get the last migration for this app
last_models = None
app_module = migration.get_app(app)
if app_module is None:
print "You cannot use automatic detection on the first migration of an app. Try --initial instead."
else:
migrations = list(migration.get_migration_classes(app_module))
if not migrations:
print "You cannot use automatic detection on the first migration of an app. Try --initial instead."
else:
if hasattr(migrations[-1], "complete_apps") and \
app in migrations[-1].complete_apps:
last_models = migrations[-1].models
last_orm = migrations[-1].orm
else:
print "You cannot use automatic detection, since the previous migration does not have this whole app frozen.\nEither make migrations using '--freeze %s' or set 'SOUTH_AUTO_FREEZE_APP = True' in your settings.py." % app
# Right, did we manage to get the last set of models?
if last_models is None:
return
# Good! Get new things.
new = dict([(model_key(model), prep_for_freeze(model))
for model in models.get_models(app_models_module)])
# And filter other apps out of the old
old = dict([(key, fields) for key, fields in last_models.items()
if key.split(".", 1)[0] == app])
am, dm, cm, af, df, cf = models_diff(old, new)
# For models that were there before and after, do a meta diff
was_meta_change = False
for mkey in cm:
au, du = meta_diff(old[mkey].get("Meta", {}),
new[mkey].get("Meta", {}))
for entry in au:
added_uniques.add((mkey, entry))
was_meta_change = True
for entry in du:
deleted_uniques.add((mkey, entry))
was_meta_change = True
if not (am or dm or af or df or cf or was_meta_change):
print "Nothing seems to have changed."
return
# Add items to the todo lists
added_models.update(am)
added_fields.update(af)
changed_fields.extend(cf)
# Deleted models are from the past, and so we use instances instead.
for mkey in dm:
model = last_orm[mkey]
fields = last_models[mkey]
if "Meta" in fields:
del fields['Meta']
deleted_models.append((model, fields, last_models))
# For deleted fields, we tag the instance on the end too
for mkey, fname in df:
deleted_fields.append((
mkey,
fname,
last_orm[mkey]._meta.get_field_by_name(fname)[0],
last_models[mkey][fname],
last_models,
))
### Added model ###
for mkey in added_models:
print " + Added model '%s'" % (mkey, )
model = model_unkey(mkey)
# Add the model's dependencies to the stubs
stub_models.update(model_dependencies(model))
# Get the field definitions
fields = modelsparser.get_model_fields(model)
# Turn the (class, args, kwargs) format into a string
fields = triples_to_defs(app, model, fields)
# Make the code
forwards += CREATE_TABLE_SNIPPET % (
model._meta.object_name,
model._meta.db_table,
"\n ".join([
"('%s', %s)," % (fname, fdef)
for fname, fdef in fields.items()
]),
model._meta.app_label,
model._meta.object_name,
)
# And the backwards code
backwards += DELETE_TABLE_SNIPPET % (model._meta.object_name,
model._meta.db_table)
# Now add M2M fields to be done
for field in model._meta.local_many_to_many:
added_fields.add((mkey, field.attname))
# And unique_togethers to be added
for ut in model._meta.unique_together:
added_uniques.add((mkey, tuple(ut)))
### Added fields ###
for mkey, field_name in added_fields:
print " + Added field '%s.%s'" % (mkey, field_name)
# Get the model
model = model_unkey(mkey)
# Get the field
try:
field = model._meta.get_field(field_name)
except FieldDoesNotExist:
print "Model '%s' doesn't have a field '%s'" % (mkey,
field_name)
return
# ManyToMany fields need special attention.
if isinstance(field, models.ManyToManyField):
if not field.rel.through: # Bug #120
# Add a stub model for each side
stub_models[model] = None
stub_models[field.rel.to] = None
# And a field defn, that's actually a table creation
forwards += CREATE_M2MFIELD_SNIPPET % (
model._meta.object_name,
field.name,
field.m2m_db_table(),
field.m2m_column_name()
[:-3], # strip off the '_id' at the end
model._meta.object_name,
field.m2m_reverse_name()
[:-3], # strip off the '_id' at the ned
field.rel.to._meta.object_name)
backwards += DELETE_M2MFIELD_SNIPPET % (
model._meta.object_name, field.name,
field.m2m_db_table())
continue
# GenericRelations need ignoring
if isinstance(field, GenericRelation):
continue
# Add any dependencies
stub_models.update(field_dependencies(field))
# Work out the definition
triple = remove_useless_attributes(
modelsparser.get_model_fields(model)[field_name])
field_definition = make_field_constructor(app, field, triple)
forwards += CREATE_FIELD_SNIPPET % (
model._meta.object_name,
field.name,
model._meta.db_table,
field.name,
field_definition,
)
backwards += DELETE_FIELD_SNIPPET % (
model._meta.object_name,
field.name,
model._meta.db_table,
field.column,
)
### Deleted fields ###
for mkey, field_name, field, triple, last_models in deleted_fields:
print " - Deleted field '%s.%s'" % (mkey, field_name)
# Get the model
model = model_unkey(mkey)
# ManyToMany fields need special attention.
if isinstance(field, models.ManyToManyField):
# Add a stub model for each side, if they're not already there
# (if we just added old versions, we might override new ones)
if model not in stub_models:
stub_models[model] = last_models
if field.rel.to not in last_models:
stub_models[field.rel.to] = last_models
# And a field defn, that's actually a table deletion
forwards += DELETE_M2MFIELD_SNIPPET % (
model._meta.object_name, field.name, field.m2m_db_table())
backwards += CREATE_M2MFIELD_SNIPPET % (
model._meta.object_name,
field.name,
field.m2m_db_table(),
field.m2m_column_name()
[:-3], # strip off the '_id' at the end
model._meta.object_name,
field.m2m_reverse_name()
[:-3], # strip off the '_id' at the ned
field.rel.to._meta.object_name)
continue
# Add any dependencies
deps = field_dependencies(field, last_models)
deps.update(stub_models)
stub_models = deps
# Work out the definition
triple = remove_useless_attributes(triple)
field_definition = make_field_constructor(app, field, triple)
forwards += DELETE_FIELD_SNIPPET % (
model._meta.object_name,
field.name,
model._meta.db_table,
field.column,
)
backwards += CREATE_FIELD_SNIPPET % (
model._meta.object_name,
field.name,
model._meta.db_table,
field.name,
field_definition,
)
### Deleted model ###
for model, fields, last_models in deleted_models:
print " - Deleted model '%s.%s'" % (model._meta.app_label,
model._meta.object_name)
# Add the model's dependencies to the stubs
deps = model_dependencies(model, last_models)
deps.update(stub_models)
stub_models = deps
# Turn the (class, args, kwargs) format into a string
fields = triples_to_defs(app, model, fields)
# Make the code
forwards += DELETE_TABLE_SNIPPET % (model._meta.object_name,
model._meta.db_table)
# And the backwards code
backwards += CREATE_TABLE_SNIPPET % (
model._meta.object_name,
model._meta.db_table,
"\n ".join([
"('%s', %s)," % (fname, fdef)
for fname, fdef in fields.items()
]),
model._meta.app_label,
model._meta.object_name,
)
### Changed fields ###
for mkey, field_name, old_triple, new_triple in changed_fields:
model = model_unkey(mkey)
old_def = triples_to_defs(app, model, {
field_name: old_triple,
})[field_name]
new_def = triples_to_defs(app, model, {
field_name: new_triple,
})[field_name]
# We need to create the field, to see if it needs _id, or if it's an M2M
field = model._meta.get_field_by_name(field_name)[0]
if hasattr(field, "m2m_db_table"):
# See if anything has ACTUALLY changed
if old_triple[1] != new_triple[1]:
print " ! Detected change to the target model of M2M field '%s.%s'. South can't handle this; leaving this change out." % (
mkey, field_name)
continue
print " ~ Changed field '%s.%s'." % (mkey, field_name)
forwards += CHANGE_FIELD_SNIPPET % (
model._meta.object_name,
field_name,
model._meta.db_table,
field.get_attname(),
new_def,
)
backwards += CHANGE_FIELD_SNIPPET % (
model._meta.object_name,
field_name,
model._meta.db_table,
field.get_attname(),
old_def,
)
### Added unique_togethers ###
for mkey, ut in added_uniques:
model = model_unkey(mkey)
print " + Added unique_together for [%s] on %s." % (
", ".join(ut), model._meta.object_name)
cols = [get_field_column(model, f) for f in ut]
forwards += CREATE_UNIQUE_SNIPPET % (
", ".join(ut),
model._meta.object_name,
model._meta.db_table,
cols,
)
backwards += DELETE_UNIQUE_SNIPPET % (
", ".join(ut),
model._meta.object_name,
model._meta.db_table,
cols,
)
### Deleted unique_togethers ###
for mkey, ut in deleted_uniques:
model = model_unkey(mkey)
print " - Deleted unique_together for [%s] on %s." % (
", ".join(ut), model._meta.object_name)
forwards += DELETE_UNIQUE_SNIPPET % (
", ".join(ut),
model._meta.object_name,
model._meta.db_table,
ut,
)
backwards += CREATE_UNIQUE_SNIPPET % (
", ".join(ut),
model._meta.object_name,
model._meta.db_table,
ut,
)
# Default values for forwards/backwards
if (not forwards) and (not backwards):
forwards = '"Write your forwards migration here"'
backwards = '"Write your backwards migration here"'
all_models = {}
# Fill out frozen model definitions
for model, last_models in frozen_models.items():
all_models[model_key(model)] = prep_for_freeze(model, last_models)
# Fill out stub model definitions
for model, last_models in stub_models.items():
key = model_key(model)
if key in all_models:
continue # We'd rather use full models than stubs.
all_models[key] = prep_for_stub(model, last_models)
# Do some model cleanup, and warnings
for modelname, model in all_models.items():
for fieldname, fielddef in model.items():
# Remove empty-after-cleaning Metas.
if fieldname == "Meta" and not fielddef:
del model['Meta']
# Warn about undefined fields
elif fielddef is None:
print "WARNING: Cannot get definition for '%s' on '%s'. Please edit the migration manually." % (
fieldname,
modelname,
)
model[fieldname] = FIELD_NEEDS_DEF_SNIPPET
# Write the migration file
fp = open(os.path.join(migrations_dir, new_filename), "w")
fp.write(MIGRATION_SNIPPET %
(encoding or "", '.'.join(app_module_path), forwards,
backwards, pprint_frozen_models(all_models),
complete_apps and "complete_apps = [%s]" %
(", ".join(map(repr, complete_apps))) or ""))
fp.close()
print "Created %s." % new_filename
