def get_mutations(app, evolution_labels, database):
"""
Obtain the list of mutations described by the named evolutions.
"""
# For each item in the evolution sequence. Check each item to see if it is
# a python file or an sql file.
try:
app_name = '.'.join(app.__name__.split('.')[:-1])
if app_name in BUILTIN_SEQUENCES:
module_name = 'django_evolution.builtin_evolutions'
else:
module_name = '%s.evolutions' % app_name
evolution_module = __import__(module_name, {}, {}, [''])
except ImportError:
return []
mutations = []
for label in evolution_labels:
directory_name = os.path.dirname(evolution_module.__file__)
# The first element is used for compatibility purposes.
filenames = [
os.path.join(directory_name, label + '.sql'),
os.path.join(directory_name, "%s_%s.sql" % (database, label)),
]
found = False
for filename in filenames:
if os.path.exists(filename):
sql = []
sql_file = open(sql_file_name)
for line in sql_file:
sql.append(line)
mutations.append(SQLMutation(label, sql))
found = True
break
if not found:
try:
module_name = [evolution_module.__name__, label]
module = __import__('.'.join(module_name), {}, {},
[module_name])
mutations.extend(module.MUTATIONS)
except ImportError:
raise EvolutionException(
'Error: Failed to find an SQL or Python evolution named %s'
% label)
if is_multi_db():
latest_version = Version.objects.using(database).latest('when')
else:
latest_version = Version.objects.latest('when')
app_label = app.__name__.split('.')[-2]
old_proj_sig = pickle.loads(str(latest_version.signature))
proj_sig = create_project_sig(database)
if app_label in old_proj_sig and app_label in proj_sig:
# We want to go through now and make sure we're only applying
# evolutions for models where the signature is different between
# what's stored and what's current.
#
# The reason for this is that we may have just installed a baseline,
# which would have the up-to-date signature, and we might be trying
# to apply evolutions on top of that (which would already be applied).
# These would generate errors. So, try hard to prevent that.
old_app_sig = old_proj_sig[app_label]
app_sig = proj_sig[app_label]
changed_models = set()
# Find the list of models in the latest signature of this app
# that aren't in the old signature.
for model_name, model_sig in app_sig.iteritems():
if (model_name not in old_app_sig
or old_app_sig[model_name] != model_sig):
changed_models.add(model_name)
# Now do the same for models in the old signature, in case the
# model has been deleted.
for model_name, model_sig in old_app_sig.iteritems():
if model_name not in app_sig:
changed_models.add(model_name)
# We should now have a full list of which models changed. Filter
# the list of mutations appropriately.
mutations = [
mutation for mutation in mutations
if (not hasattr(mutation, 'model_name')
or mutation.model_name in changed_models)
]
return mutations
def evolution(app, created_models, verbosity=1, **kwargs):
"""
A hook into syncdb's post_syncdb signal, that is used to notify the user
if a model evolution is necessary.
"""
default_db = None
if is_multi_db():
from django.db.utils import DEFAULT_DB_ALIAS
default_db = DEFAULT_DB_ALIAS
db = kwargs.get('db', default_db)
proj_sig = create_project_sig(db)
signature = pickle.dumps(proj_sig)
using_args = {}
if is_multi_db():
using_args['using'] = db
try:
if is_multi_db():
latest_version = \
django_evolution.Version.objects.using(db).latest('when')
else:
latest_version = django_evolution.Version.objects.latest('when')
except django_evolution.Version.DoesNotExist:
# We need to create a baseline version.
if verbosity > 0:
print "Installing baseline version"
latest_version = django_evolution.Version(signature=signature)
latest_version.save(**using_args)
for a in get_apps():
install_baseline(a, latest_version, using_args, verbosity)
unapplied = get_unapplied_evolutions(app, db)
if unapplied:
print style.NOTICE('There are unapplied evolutions for %s.'
% app.__name__.split('.')[-2])
# Evolutions are checked over the entire project, so we only need to check
# once. We do this check when Django Evolutions itself is synchronized.
if app == django_evolution:
old_proj_sig = pickle.loads(str(latest_version.signature))
# If any models or apps have been added, a baseline must be set
# for those new models
changed = False
new_apps = []
for app_name, new_app_sig in proj_sig.items():
if app_name == '__version__':
# Ignore the __version__ tag
continue
old_app_sig = old_proj_sig.get(app_name, None)
if old_app_sig is None:
# App has been added
old_proj_sig[app_name] = proj_sig[app_name]
new_apps.append(app_name)
changed = True
else:
for model_name, new_model_sig in new_app_sig.items():
old_model_sig = old_app_sig.get(model_name, None)
if old_model_sig is None:
# Model has been added
old_proj_sig[app_name][model_name] = \
proj_sig[app_name][model_name]
changed = True
if changed:
if verbosity > 0:
print "Adding baseline version for new models"
latest_version = \
django_evolution.Version(signature=pickle.dumps(old_proj_sig))
latest_version.save(**using_args)
for app_name in new_apps:
install_baseline(get_app(app_name), latest_version, using_args,
verbosity)
# TODO: Model introspection step goes here.
# # If the current database state doesn't match the last
# # saved signature (as reported by latest_version),
# # then we need to update the Evolution table.
# actual_sig = introspect_project_sig()
# acutal = pickle.dumps(actual_sig)
# if actual != latest_version.signature:
# nudge = Version(signature=actual)
# nudge.save()
# latest_version = nudge
diff = Diff(old_proj_sig, proj_sig)
if not diff.is_empty():
print style.NOTICE(
'Project signature has changed - an evolution is required')
if verbosity > 1:
old_proj_sig = pickle.loads(str(latest_version.signature))
print diff
def evolution(app, created_models, verbosity=1, **kwargs):
"""
A hook into syncdb's post_syncdb signal, that is used to notify the user
if a model evolution is necessary.
"""
default_db = DEFAULT_DB_ALIAS
db = kwargs.get('db', default_db)
proj_sig = create_project_sig(db)
signature = pickle.dumps(proj_sig)
using_args = {
'using': db,
}
try:
latest_version = \
django_evolution.Version.objects.current_version(using=db)
except django_evolution.Version.DoesNotExist:
# We need to create a baseline version.
if verbosity > 0:
print "Installing baseline version"
latest_version = django_evolution.Version(signature=signature)
latest_version.save(**using_args)
for a in get_apps():
install_baseline(a, latest_version, using_args, verbosity)
unapplied = get_unapplied_evolutions(app, db)
if unapplied:
print style.NOTICE('There are unapplied evolutions for %s.'
% app.__name__.split('.')[-2])
# Evolutions are checked over the entire project, so we only need to check
# once. We do this check when Django Evolutions itself is synchronized.
if app == django_evolution:
old_proj_sig = pickle.loads(str(latest_version.signature))
# If any models or apps have been added, a baseline must be set
# for those new models
changed = False
new_apps = []
for app_name, new_app_sig in proj_sig.items():
if app_name == '__version__':
# Ignore the __version__ tag
continue
old_app_sig = old_proj_sig.get(app_name, None)
if old_app_sig is None:
# App has been added
old_proj_sig[app_name] = proj_sig[app_name]
new_apps.append(app_name)
changed = True
else:
for model_name, new_model_sig in new_app_sig.items():
old_model_sig = old_app_sig.get(model_name, None)
if old_model_sig is None:
# Model has been added
old_proj_sig[app_name][model_name] = \
proj_sig[app_name][model_name]
changed = True
if changed:
if verbosity > 0:
print "Adding baseline version for new models"
latest_version = \
django_evolution.Version(signature=pickle.dumps(old_proj_sig))
latest_version.save(**using_args)
for app_name in new_apps:
app = get_app(app_name, True)
if app:
install_baseline(app, latest_version, using_args,
verbosity)
# TODO: Model introspection step goes here.
# # If the current database state doesn't match the last
# # saved signature (as reported by latest_version),
# # then we need to update the Evolution table.
# actual_sig = introspect_project_sig()
# acutal = pickle.dumps(actual_sig)
# if actual != latest_version.signature:
# nudge = Version(signature=actual)
# nudge.save()
# latest_version = nudge
diff = Diff(old_proj_sig, proj_sig)
if not diff.is_empty():
print style.NOTICE(
'Project signature has changed - an evolution is required')
if verbosity > 1:
old_proj_sig = pickle.loads(str(latest_version.signature))
print diff
'executing evolutions.')
try:
app_list = [get_app(app_label) for app_label in app_labels]
except (ImproperlyConfigured, ImportError), e:
raise CommandError("%s. Are you sure your INSTALLED_APPS "
"setting is correct?" % e)
else:
app_list = get_apps()
# Iterate over all applications running the mutations
evolution_required = False
simulated = True
sql = []
new_evolutions = []
current_proj_sig = create_project_sig(database)
current_signature = pickle.dumps(current_proj_sig)
try:
if is_multi_db():
latest_version = Version.objects.using(database).latest('when')
else:
latest_version = Version.objects.latest('when')
database_sig = pickle.loads(str(latest_version.signature))
diff = Diff(database_sig, current_proj_sig)
except Evolution.DoesNotExist:
raise CommandError("Can't evolve yet. Need to set an "
"evolution baseline.")
try:
'executing evolutions.')
try:
app_list = [get_app(app_label) for app_label in app_labels]
except (ImproperlyConfigured, ImportError), e:
raise CommandError("%s. Are you sure your INSTALLED_APPS "
"setting is correct?" % e)
else:
app_list = get_apps()
# Iterate over all applications running the mutations
evolution_required = False
simulated = True
sql = []
new_evolutions = []
current_proj_sig = create_project_sig(database)
current_signature = pickle.dumps(current_proj_sig)
try:
if is_multi_db():
latest_version = Version.objects.using(database).latest('when')
else:
latest_version = Version.objects.latest('when')
database_sig = pickle.loads(str(latest_version.signature))
diff = Diff(database_sig, current_proj_sig)
except Evolution.DoesNotExist:
raise CommandError("Can't evolve yet. Need to set an "
"evolution baseline.")
try:
def get_mutations(app, evolution_labels, database):
"""
Obtain the list of mutations described by the named evolutions.
"""
# For each item in the evolution sequence. Check each item to see if it is
# a python file or an sql file.
try:
app_name = '.'.join(app.__name__.split('.')[:-1])
if app_name in BUILTIN_SEQUENCES:
module_name = 'django_evolution.builtin_evolutions'
else:
module_name = '%s.evolutions' % app_name
evolution_module = __import__(module_name, {}, {}, [''])
except ImportError:
return []
mutations = []
for label in evolution_labels:
directory_name = os.path.dirname(evolution_module.__file__)
# The first element is used for compatibility purposes.
filenames = [
os.path.join(directory_name, label + '.sql'),
os.path.join(directory_name, "%s_%s.sql" % (database, label)),
]
found = False
for filename in filenames:
if os.path.exists(filename):
sql = []
sql_file = open(sql_file_name)
for line in sql_file:
sql.append(line)
mutations.append(SQLMutation(label, sql))
found = True
break
if not found:
try:
module_name = [evolution_module.__name__, label]
module = __import__('.'.join(module_name),
{}, {}, [module_name]);
mutations.extend(module.MUTATIONS)
except ImportError:
raise EvolutionException(
'Error: Failed to find an SQL or Python evolution named %s'
% label)
if is_multi_db():
latest_version = Version.objects.using(database).latest('when')
else:
latest_version = Version.objects.latest('when')
app_label = app.__name__.split('.')[-2]
old_proj_sig = pickle.loads(str(latest_version.signature))
proj_sig = create_project_sig(database)
if app_label in old_proj_sig and app_label in proj_sig:
# We want to go through now and make sure we're only applying
# evolutions for models where the signature is different between
# what's stored and what's current.
#
# The reason for this is that we may have just installed a baseline,
# which would have the up-to-date signature, and we might be trying
# to apply evolutions on top of that (which would already be applied).
# These would generate errors. So, try hard to prevent that.
old_app_sig = old_proj_sig[app_label]
app_sig = proj_sig[app_label]
changed_models = set()
# Find the list of models in the latest signature of this app
# that aren't in the old signature.
for model_name, model_sig in app_sig.iteritems():
if (model_name not in old_app_sig or
old_app_sig[model_name] != model_sig):
changed_models.add(model_name)
# Now do the same for models in the old signature, in case the
# model has been deleted.
for model_name, model_sig in old_app_sig.iteritems():
if model_name not in app_sig:
changed_models.add(model_name)
# We should now have a full list of which models changed. Filter
# the list of mutations appropriately.
mutations = [
mutation
for mutation in mutations
if (not hasattr(mutation, 'model_name') or
mutation.model_name in changed_models)
]
return mutations
try:
app_list = [get_app(app_label) for app_label in app_labels]
except (ImproperlyConfigured, ImportError), e:
raise CommandError("%s. Are you sure your INSTALLED_APPS "
"setting is correct?" % e)
else:
app_list = get_apps()
# Iterate over all applications running the mutations
evolution_required = False #j--------------------变更请求
simulated = True
sql = []
do_actions = []
new_evolutions = []
current_proj_sig = create_project_sig(
database) #j-------------------当前版本的数据库整体结构
current_signature = pickle.dumps(current_proj_sig)
try:
if is_multi_db():
latest_version = Version.objects.using(database).latest('when')
else:
latest_version = Version.objects.latest('when')
database_sig = pickle.loads(str(latest_version.signature)
) #j-------------------得到上一个版本的数据库整体结构
diff = Diff(database_sig, current_proj_sig)
except Evolution.DoesNotExist:
raise CommandError("Can't evolve yet. Need to set an "
"evolution baseline.")
if execute:
raise CommandError('Cannot specify an application name when executing evolutions.')
try:
app_list = [get_app(app_label) for app_label in app_labels]
except (ImproperlyConfigured, ImportError), e:
raise CommandError("%s. Are you sure your INSTALLED_APPS setting is correct?" % e)
else:
app_list = get_apps()
# Iterate over all applications running the mutations
evolution_required = False
simulated = True
sql = []
new_evolutions = []
current_proj_sig = create_project_sig()
current_signature = pickle.dumps(current_proj_sig)
try:
latest_version = Version.objects.latest('when')
database_sig = pickle.loads(str(latest_version.signature))
diff = Diff(database_sig, current_proj_sig)
except Evolution.DoesNotExist:
print self.style.ERROR("Can't evolve yet. Need to set an evolution baseline.")
sys.exit(1)
try:
for app in app_list:
app_label = app.__name__.split('.')[-2]
if hint:
evolutions = []
try:
app_list = [get_app(app_label) for app_label in app_labels]
except (ImproperlyConfigured, ImportError), e:
raise CommandError("%s. Are you sure your INSTALLED_APPS "
"setting is correct?" % e)
else:
app_list = get_apps()
# Iterate over all applications running the mutations
evolution_required = False #j--------------------变更请求
simulated = True
sql = []
do_actions=[]
new_evolutions = []
current_proj_sig = create_project_sig(database) #j-------------------当前版本的数据库整体结构
current_signature = pickle.dumps(current_proj_sig)
try:
if is_multi_db():
latest_version = Version.objects.using(database).latest('when')
else:
latest_version = Version.objects.latest('when')
database_sig = pickle.loads(str(latest_version.signature)) #j-------------------得到上一个版本的数据库整体结构
diff = Diff(database_sig, current_proj_sig)
except Evolution.DoesNotExist:
raise CommandError("Can't evolve yet. Need to set an "
"evolution baseline.")
try:
def evolution(app, created_models, verbosity=1, **kwargs):
"""
A hook into syncdb's post_syncdb signal, that is used to notify the user
if a model evolution is necessary.
"""
proj_sig = create_project_sig()
signature = pickle.dumps(proj_sig)
try:
latest_version = django_evolution.Version.objects.latest('when')
except django_evolution.Version.DoesNotExist:
# We need to create a baseline version.
if verbosity > 0:
print "Installing baseline version"
latest_version = django_evolution.Version(signature=signature)
latest_version.save()
for a in get_apps():
app_label = a.__name__.split('.')[-2]
sequence = get_evolution_sequence(a)
if sequence:
if verbosity > 0:
print 'Evolutions in %s baseline:' % app_label,', '.join(sequence)
for evo_label in sequence:
evolution = django_evolution.Evolution(app_label=app_label,
label=evo_label,
version=latest_version)
evolution.save()
unapplied = get_unapplied_evolutions(app)
if unapplied:
print style.NOTICE('There are unapplied evolutions for %s.' % app.__name__.split('.')[-2])
# Evolutions are checked over the entire project, so we only need to
# check once. We do this check when Django Evolutions itself is synchronized.
if app == django_evolution:
old_proj_sig = pickle.loads(str(latest_version.signature))
# If any models have been added, a baseline must be set
# for those new models
changed = False
for app_name, new_app_sig in proj_sig.items():
if app_name == '__version__':
# Ignore the __version__ tag
continue
old_app_sig = old_proj_sig.get(app_name, None)
if old_app_sig is None:
# App has been added
old_proj_sig[app_name] = proj_sig[app_name]
changed = True
continue
for model_name, new_model_sig in new_app_sig.items():
old_model_sig = old_app_sig.get(model_name, None)
if old_model_sig is None:
# Model has been added
old_proj_sig[app_name][model_name] = proj_sig[app_name][model_name]
changed = True
if changed:
if verbosity > 0:
print "Adding baseline version for new models"
latest_version = django_evolution.Version(signature=pickle.dumps(old_proj_sig))
latest_version.save()
# TODO: Model introspection step goes here.
# # If the current database state doesn't match the last
# # saved signature (as reported by latest_version),
# # then we need to update the Evolution table.
# actual_sig = introspect_project_sig()
# acutal = pickle.dumps(actual_sig)
# if actual != latest_version.signature:
# nudge = Version(signature=actual)
# nudge.save()
# latest_version = nudge
diff = Diff(old_proj_sig, proj_sig)
if not diff.is_empty():
print style.NOTICE('Project signature has changed - an evolution is required')
if verbosity > 1:
old_proj_sig = pickle.loads(str(latest_version.signature))
print diff
def evolution(app, created_models, verbosity=1, **kwargs):
"""
A hook into syncdb's post_syncdb signal, that is used to notify the user
if a model evolution is necessary.
"""
proj_sig = create_project_sig()
signature = pickle.dumps(proj_sig)
try:
latest_version = django_evolution.Version.objects.latest('when')
except django_evolution.Version.DoesNotExist:
# We need to create a baseline version.
if verbosity > 0:
print "Installing baseline version"
latest_version = django_evolution.Version(signature=signature)
latest_version.save()
for a in get_apps():
app_label = a.__name__.split('.')[-2]
sequence = get_evolution_sequence(a)
if sequence:
if verbosity > 0:
print 'Evolutions in %s baseline:' % app_label, ', '.join(
sequence)
for evo_label in sequence:
evolution = django_evolution.Evolution(app_label=app_label,
label=evo_label,
version=latest_version)
evolution.save()
unapplied = get_unapplied_evolutions(app)
if unapplied:
print style.NOTICE('There are unapplied evolutions for %s.' %
app.__name__.split('.')[-2])
# Evolutions are checked over the entire project, so we only need to
# check once. We do this check when Django Evolutions itself is synchronized.
if app == django_evolution:
old_proj_sig = pickle.loads(str(latest_version.signature))
# If any models have been added, a baseline must be set
# for those new models
changed = False
for app_name, new_app_sig in proj_sig.items():
if app_name == '__version__':
# Ignore the __version__ tag
continue
old_app_sig = old_proj_sig.get(app_name, None)
if old_app_sig is None:
# App has been added
old_proj_sig[app_name] = proj_sig[app_name]
changed = True
continue
for model_name, new_model_sig in new_app_sig.items():
old_model_sig = old_app_sig.get(model_name, None)
if old_model_sig is None:
# Model has been added
old_proj_sig[app_name][model_name] = proj_sig[app_name][
model_name]
changed = True
if changed:
if verbosity > 0:
print "Adding baseline version for new models"
latest_version = django_evolution.Version(
signature=pickle.dumps(old_proj_sig))
latest_version.save()
# TODO: Model introspection step goes here.
# # If the current database state doesn't match the last
# # saved signature (as reported by latest_version),
# # then we need to update the Evolution table.
# actual_sig = introspect_project_sig()
# acutal = pickle.dumps(actual_sig)
# if actual != latest_version.signature:
# nudge = Version(signature=actual)
# nudge.save()
# latest_version = nudge
diff = Diff(old_proj_sig, proj_sig)
if not diff.is_empty():
print style.NOTICE(
'Project signature has changed - an evolution is required')
if verbosity > 1:
old_proj_sig = pickle.loads(str(latest_version.signature))
print diff
try:
app_list = [get_app(app_label) for app_label in app_labels]
except (ImproperlyConfigured, ImportError), e:
raise CommandError(
"%s. Are you sure your INSTALLED_APPS setting is correct?"
% e)
else:
app_list = get_apps()
# Iterate over all applications running the mutations
evolution_required = False
simulated = True
sql = []
new_evolutions = []
current_proj_sig = create_project_sig()
current_signature = pickle.dumps(current_proj_sig)
try:
latest_version = Version.objects.latest('when')
database_sig = pickle.loads(str(latest_version.signature))
diff = Diff(database_sig, current_proj_sig)
except Evolution.DoesNotExist:
print self.style.ERROR(
"Can't evolve yet. Need to set an evolution baseline.")
sys.exit(1)
try:
for app in app_list:
app_label = app.__name__.split('.')[-2]
if hint:
