78 lines
3.0 KiB
Python
78 lines
3.0 KiB
Python
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from django.core import checks
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from django.db.backends.base.validation import BaseDatabaseValidation
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from django.utils.version import get_docs_version
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class DatabaseValidation(BaseDatabaseValidation):
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def check(self, **kwargs):
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issues = super().check(**kwargs)
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issues.extend(self._check_sql_mode(**kwargs))
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return issues
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def _check_sql_mode(self, **kwargs):
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if not (
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self.connection.sql_mode & {"STRICT_TRANS_TABLES", "STRICT_ALL_TABLES"}
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):
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return [
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checks.Warning(
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"%s Strict Mode is not set for database connection '%s'"
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% (self.connection.display_name, self.connection.alias),
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hint=(
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"%s's Strict Mode fixes many data integrity problems in "
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"%s, such as data truncation upon insertion, by "
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"escalating warnings into errors. It is strongly "
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"recommended you activate it. See: "
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"https://docs.djangoproject.com/en/%s/ref/databases/"
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"#mysql-sql-mode"
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% (
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self.connection.display_name,
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self.connection.display_name,
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get_docs_version(),
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),
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),
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id="mysql.W002",
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)
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]
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return []
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def check_field_type(self, field, field_type):
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"""
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MySQL has the following field length restriction:
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No character (varchar) fields can have a length exceeding 255
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characters if they have a unique index on them.
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MySQL doesn't support a database index on some data types.
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"""
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errors = []
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if (
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field_type.startswith("varchar")
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and field.unique
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and (field.max_length is None or int(field.max_length) > 255)
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):
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errors.append(
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checks.Warning(
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"%s may not allow unique CharFields to have a max_length "
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"> 255." % self.connection.display_name,
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obj=field,
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hint=(
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"See: https://docs.djangoproject.com/en/%s/ref/"
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"databases/#mysql-character-fields" % get_docs_version()
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),
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id="mysql.W003",
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)
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)
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if field.db_index and field_type.lower() in self.connection._limited_data_types:
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errors.append(
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checks.Warning(
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"%s does not support a database index on %s columns."
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% (self.connection.display_name, field_type),
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hint=(
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"An index won't be created. Silence this warning if "
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"you don't care about it."
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),
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obj=field,
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id="fields.W162",
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)
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)
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return errors
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