def check_field(self, field, **kwargs):
"""
MySQL has the following field length restriction:
No character (varchar) fields can have a length exceeding 255
characters if they have a unique index on them.
"""
from arouse._dj.db import connection
errors = super(DatabaseValidation, self).check_field(field, **kwargs)
# Ignore any related fields.
if getattr(field, 'remote_field', None) is None:
field_type = field.db_type(connection)
# Ignore any non-concrete fields
if field_type is None:
return errors
if (field_type.startswith('varchar') and field.unique and
(field.max_length is None or int(field.max_length) > 255)):
errors.append(
checks.Error(
'MySQL does not allow unique CharFields to have a max_length > 255.',
obj=field,
id='mysql.E001',
))
return errors
def check(self, **kwargs):
errors = super(ArrayField, self).check(**kwargs)
if self.base_field.remote_field:
errors.append(
checks.Error('Base field for array cannot be a related field.',
obj=self,
id='postgres.E002'))
else:
# Remove the field name checks as they are not needed here.
base_errors = self.base_field.check()
if base_errors:
messages = '\n '.join('%s (%s)' % (error.msg, error.id)
for error in base_errors)
errors.append(
checks.Error('Base field for array has errors:\n %s' %
messages,
obj=self,
id='postgres.E001'))
return errors
def _check_primary_key(self):
if self._primary_key_set_explicitly:
return [
checks.Error(
"'primary_key' is not a valid argument for a %s." %
self.__class__.__name__,
obj=self,
id='fields.E201',
)
]
else:
return []
def _check_unique(self):
if self._unique_set_explicitly:
return [
checks.Error(
"'unique' is not a valid argument for a %s." %
self.__class__.__name__,
obj=self,
id='fields.E200',
)
]
else:
return []
def _check_image_library_installed(self):
try:
from PIL import Image # NOQA
except ImportError:
return [
checks.Error(
'Cannot use ImageField because Pillow is not installed.',
hint=('Get Pillow at https://pypi.python.org/pypi/Pillow '
'or run command "pip install Pillow".'),
obj=self,
id='fields.E210',
)
]
else:
return []