def _alter_field(self, model, old_field, new_field, old_type, new_type,
old_db_params, new_db_params, strict=False):
# Skip to the base class to avoid trying to add or drop
# PostgreSQL-specific LIKE indexes.
BaseDatabaseSchemaEditor._alter_field(
self, model, old_field, new_field, old_type, new_type, old_db_params,
new_db_params, strict,
)
# Add or remove `DEFAULT unique_rowid()` for AutoField.
old_suffix = old_field.db_type_suffix(self.connection)
new_suffix = new_field.db_type_suffix(self.connection)
if old_suffix != new_suffix:
if new_suffix:
self.execute(self.sql_alter_column % {
'table': self.quote_name(model._meta.db_table),
'changes': 'ALTER COLUMN %(column)s SET %(expression)s' % {
'column': self.quote_name(new_field.column),
'expression': new_suffix,
}
})
else:
self.execute(self.sql_alter_column % {
'table': self.quote_name(model._meta.db_table),
'changes': 'ALTER COLUMN %(column)s DROP DEFAULT' % {
'column': self.quote_name(new_field.column),
}
})
def _alter_field(self, model, old_field, new_field, old_type, new_type,
old_db_params, new_db_params, strict=False):
# ALTER COLUMN TYPE is experimental.
# https://github.com/cockroachdb/cockroach/issues/49329
if (self.connection.features.is_cockroachdb_21_1 and old_type != new_type or
getattr(old_field, 'db_collation', None) != getattr(new_field, 'db_collation', None)):
self.execute('SET enable_experimental_alter_column_type_general = true')
# Skip to the base class to avoid trying to add or drop
# PostgreSQL-specific LIKE indexes.
BaseDatabaseSchemaEditor._alter_field(
self, model, old_field, new_field, old_type, new_type, old_db_params,
new_db_params, strict,
)
# Add or remove `DEFAULT unique_rowid()` for AutoField.
old_suffix = old_field.db_type_suffix(self.connection)
new_suffix = new_field.db_type_suffix(self.connection)
if old_suffix != new_suffix:
if new_suffix:
self.execute(self.sql_alter_column % {
'table': self.quote_name(model._meta.db_table),
'changes': 'ALTER COLUMN %(column)s SET %(expression)s' % {
'column': self.quote_name(new_field.column),
'expression': new_suffix,
}
})
else:
self.execute(self.sql_alter_column % {
'table': self.quote_name(model._meta.db_table),
'changes': 'ALTER COLUMN %(column)s DROP DEFAULT' % {
'column': self.quote_name(new_field.column),
}
})
def install_model(custom_model):
from django.db import connection
from django.db.backends.base.schema import BaseDatabaseSchemaEditor
editor = BaseDatabaseSchemaEditor(connect)
try:
editor.create_model(model=custom_model)
except AttributeError as aerror:
print(aerror)
def _alter_field(self, model, old_field, new_field, old_type, new_type,
old_db_params, new_db_params, strict=False):
# Skip to the base class to avoid trying to add or drop
# PostgreSQL-specific LIKE indexes.
BaseDatabaseSchemaEditor._alter_field(
self, model, old_field, new_field, old_type, new_type, old_db_params,
new_db_params, strict,
)
def destroy(self, request, *args, **kwargs):
objeto = self.get_object()
modelo = crear_modelo(objeto.nombre)
self.perform_destroy(objeto)
esquema = BaseDatabaseSchemaEditor(connection)
esquema.delete_model(modelo)
return Response(status=204)
def database_forwards(self, app_label, schema_editor: BaseDatabaseSchemaEditor, from_state, to_state: ProjectState):
to_model = to_state.apps.get_model(app_label, self.model_name)
meta = to_model._meta
to_field = meta.get_field(self.name)
if to_field.default != NOT_PROVIDED:
table_name = schema_editor.quote_name(meta.db_table)
column = schema_editor.quote_name(to_field.column)
default = schema_editor.quote_value(to_field.default)
schema_editor.execute("ALTER TABLE {} ALTER COLUMN {} SET DEFAULT {}".format(table_name, column, default))
def _alter_field(self, model, old_field, new_field, old_type, new_type,
old_db_params, new_db_params, strict=False):
if old_field.db_index or old_field.unique:
index_name = self._create_index_name(model._meta.db_table, [old_field.column])
self.execute(self._delete_index_sql(model, index_name))
BaseDatabaseSchemaEditor._alter_field(
self, model, old_field, new_field, old_type, new_type, old_db_params,
new_db_params, strict,
)
def database_forwards(
self,
app_label: str,
schema_editor: BaseDatabaseSchemaEditor,
from_state: ProjectState,
to_state: ProjectState,
) -> None:
model = to_state.apps.get_model(app_label, self.model)
sql = utils.remove_audit_logging_sql(audit_logged_model=model)
for query in sql:
schema_editor.execute(query)
def desde_tabla(self, instancia):
opciones = {"__module__": "capas"}
geom = instancia.atributos.filter(nombre="geom").first()
if geom is None:
raise ValidationError({"capa": "falta atributo geom"})
opciones.update({"geom": self.get_tipo(geom.tipo)})
for i in instancia.atributos.all():
if i.nombre.lower() in ["id", "geom"]:
continue
opciones.update({i.nombre.lower(): self.get_tipo(i.tipo)})
modelo = type(instancia.nombre, (models.Model, ), opciones)
esquema = BaseDatabaseSchemaEditor(connection)
esquema.deferred_sql = []
esquema.create_model(modelo)
def digest(connection, *args):
"""Return a digest hash for a set of arguments.
This is mostly used as part of the index/constraint name generation
processes. It offers compatibility with a range of Django versions.
Args:
connection (object):
The database connection.
*args (tuple):
The positional arguments used to build the digest hash out of.
Returns:
str:
The resulting digest hash.
"""
if (BaseDatabaseSchemaEditor
and hasattr(BaseDatabaseSchemaEditor, '_digest')):
# Django >= 1.8
#
# Note that _digest() is a classmethod that is common across all
# database backends. We don't need to worry about using a
# per-instance version. If that changes, we'll need to create a
# SchemaEditor.
return BaseDatabaseSchemaEditor._digest(*args)
else:
# Django < 1.8
return connection.creation._digest(*args)
def _alter_column_type_sql(self, model, old_field, new_field, new_type):
self.sql_alter_column_type = 'ALTER COLUMN %(column)s TYPE %(type)s'
# Cast when data type changed.
if self._field_data_type(old_field) != self._field_data_type(
new_field):
self.sql_alter_column_type += ' USING %(column)s::%(type)s'
# Make ALTER TYPE with SERIAL make sense.
# table = strip_quotes(model._meta.db_table)
serial_fields_map = {
'bigserial': 'bigint',
'serial': 'integer',
'smallserial': 'smallint'
}
if new_type.lower() in serial_fields_map:
column = strip_quotes(new_field.column)
return (
(
self.sql_alter_column_type % {
"column": self.quote_name(column),
"type": serial_fields_map[new_type.lower()],
},
[],
),
# The PostgreSQL backend manages the column sequence here but
# this isn't applicable on CockroachDB because unique_rowid()
# is used instead of sequences.
[],
)
else:
return BaseDatabaseSchemaEditor._alter_column_type_sql(
self, model, old_field, new_field, new_type)
def _sql_indexes_for_field(self, model, field):
"""
Return the CREATE INDEX SQL statements for a single model field
:param model:
:param field:
:return:
"""
def qn(name):
if name.startswith('"') and name.endswith('"'):
return name # Quoting once is enough.
return '"%s"' % name
max_name_length = 63
if field.db_index and not field.unique:
i_name = "%s_%s" % (
model._meta.db_table,
BaseDatabaseSchemaEditor._digest(field.column),
)
return [
"CREATE INDEX %s ON %s(%s)" % (
qn(truncate_name(i_name, max_name_length)),
qn(model._meta.db_table),
qn(field.column),
)
]
return []
def digest(connection, *args):
"""Return a digest hash for a set of arguments.
This is mostly used as part of the index/constraint name generation
processes. It offers compatibility with a range of Django versions.
Args:
connection (object):
The database connection.
*args (tuple):
The positional arguments used to build the digest hash out of.
Returns:
str:
The resulting digest hash.
"""
if (BaseDatabaseSchemaEditor and
hasattr(BaseDatabaseSchemaEditor, '_digest')):
# Django >= 1.8
#
# Note that _digest() is a classmethod that is common across all
# database backends. We don't need to worry about using a
# per-instance version. If that changes, we'll need to create a
# SchemaEditor.
return BaseDatabaseSchemaEditor._digest(*args)
else:
# Django < 1.8
return connection.creation._digest(*args)
def database_backwards(
self,
app_label: str,
schema_editor: BaseDatabaseSchemaEditor,
from_state: ProjectState,
to_state: ProjectState,
) -> None:
model = from_state.apps.get_model(app_label, self.model)
sql = utils.add_audit_logging_sql(
audit_logged_model=model,
context_model=utils.get_context_model(from_state.apps),
log_entry_model=utils.get_log_entry_model(from_state.apps),
)
for query in sql:
schema_editor.execute(query)
def importar_tabla(self):
"""
crea la tabla con su estructura en la base de datos
"""
self.validar_capa()
attrs = self.capa.common_attributes
opciones = {"__module__": "capas"}
for i in attrs:
if i.lower() == "id":
continue
opciones.update(
{i.lower(): models.CharField(max_length=255, null=True)})
opciones.update({"geom": self.get_tipo(self.capa[0].geometry.type)})
modelo = type(self.nombre, (models.Model, ), opciones)
esquema = BaseDatabaseSchemaEditor(connection)
esquema.deferred_sql = []
esquema.create_model(modelo)
self.alterar_registros_nuevo(modelo)
self.registrar_estructura(attrs)
def test_effective_default_callable(self):
"""SchemaEditor.effective_default() shouldn't call callable defaults."""
class MyStr(str):
def __call__(self):
return self
class MyCharField(models.CharField):
def _get_default(self):
return self.default
field = MyCharField(max_length=1, default=MyStr)
self.assertEqual(BaseDatabaseSchemaEditor._effective_default(field), MyStr)
def unseed(apps: Apps, schema_editor: BaseDatabaseSchemaEditor):
schema_editor.execute("delete from playlister_song")
schema_editor.execute("""
delete from playlister_playlistentry
where playlist_id in (
select id from playlister_playlist
where name like 'Seeded playlist %')
""")
schema_editor.execute("""delete from playlister_playlist
where name like 'Seeded playlist %'""")
def _index_columns(self, table, columns, col_suffixes, opclasses):
# cockroachdb doesn't support PostgreSQL opclasses.
return BaseDatabaseSchemaEditor._index_columns(self, table, columns, col_suffixes, opclasses)
def __init__(self):
self.TimeSeriesBaseModel = get_model(self.app_label, self.model_name)
# first check to see if the model exists in Django's model cache
from django.apps import registry
try:
if registry.apps.get_model(self.app_label, self.name):
self.TimeSeriesModel = registry.apps.get_model(
self.app_label, self.name)
return
except LookupError:
pass
# model did not exist in Django's model cache, so let's build it and load it
class Meta:
db_table = self.name # TODO support overriding table name
fields = {
'original_model': models.ForeignKey(self.TimeSeriesBaseModel),
'timestamp': models.DateTimeField(db_index=True),
'__module__': self.app_label + '.models',
'Meta': Meta
}
for f in self.time_series_properties:
if f == 'timestamp':
raise Exception('Cannot time series a field named "timestamp"')
field_class = None
max_digits = 0
decimal_places = 0
max_length = 0
for model_field in self.TimeSeriesBaseModel._meta.fields:
if model_field.name == f:
field_class = model_field.__class__
# TODO support all default django fields
if not (issubclass(field_class, models.DecimalField)
or issubclass(field_class, models.IntegerField)
or issubclass(field_class, models.CharField)
or issubclass(field_class, models.TextField)
or issubclass(field_class, models.URLField)
or issubclass(field_class, models.DateTimeField)
or issubclass(field_class, models.DateField)
or issubclass(field_class, models.FloatField)):
raise Exception("Class {} not supported".format(
field_class.__name__))
if field_class == models.DecimalField:
# must bring over params in the case of decimal field
max_digits = model_field.max_digits
decimal_places = model_field.decimal_places
if field_class == models.CharField:
# must bring over max length in case of char field
max_length = model_field.max_length
break
if field_class is None:
raise Exception(
"Field {} could not be found in class {}".format(
f, self.TimeSeriesBaseModel.__name__))
fields[f] = field_class()
if field_class == models.DecimalField:
fields[f].max_digits = max_digits
fields[f].decimal_places = decimal_places
if field_class == models.CharField:
fields[f].max_length = max_length
for field_name, field_instance, function in self.time_series_functions:
fields[field_name] = field_instance
self.TimeSeriesModel = type(self.name, (models.Model, ), fields)
# next make sure that the tables exist in the database. if not, build them.
from django.db import connection
try:
cursor = connection.cursor()
cursor.execute("SELECT * FROM {} LIMIT 1".format(self.name))
except ProgrammingError:
# Looks like the table doesn't exist! Let's build it!
from django.db import connection
from django.db.backends.base.schema import BaseDatabaseSchemaEditor
schema_editor = BaseDatabaseSchemaEditor(connection)
with schema_editor:
schema_editor.create_model(self.TimeSeriesModel)
def _field_indexes_sql(self, model, field):
# Postgres needs an operator defined for like queries to work
# properly text and varchars. Skip to the base class version
# to avoid this.
return BaseDatabaseSchemaEditor._field_indexes_sql(self, model, field)
def _model_indexes_sql(self, model):
# Postgres customizes _model_indexes_sql to add special-case
# options for string fields. Skip to the base class version
# to avoid this.
return BaseDatabaseSchemaEditor._model_indexes_sql(self, model)
def __init__(self):
self.TimeSeriesBaseModel = get_model(self.app_label, self.model_name)
# first check to see if the model exists in Django's model cache
from django.apps import registry
try:
if registry.apps.get_model(self.app_label, self.name):
self.TimeSeriesModel = registry.apps.get_model(self.app_label, self.name)
return
except LookupError:
pass
# model did not exist in Django's model cache, so let's build it and load it
class Meta:
db_table = self.name # TODO support overriding table name
fields = {
'original_model': models.ForeignKey(self.TimeSeriesBaseModel),
'timestamp': models.DateTimeField(db_index=True),
'__module__': self.app_label + '.models',
'Meta': Meta
}
for f in self.time_series_properties:
if f == 'timestamp':
raise Exception('Cannot time series a field named "timestamp"')
field_class = None
max_digits = 0
decimal_places = 0
max_length = 0
for model_field in self.TimeSeriesBaseModel._meta.fields:
if model_field.name == f:
field_class = model_field.__class__
# TODO support all default django fields
if not (issubclass(field_class, models.DecimalField) or
issubclass(field_class, models.IntegerField) or
issubclass(field_class, models.CharField) or
issubclass(field_class, models.TextField) or
issubclass(field_class, models.URLField) or
issubclass(field_class, models.DateTimeField) or
issubclass(field_class, models.DateField) or
issubclass(field_class, models.FloatField)):
raise Exception("Class {} not supported".format(field_class.__name__))
if field_class == models.DecimalField:
# must bring over params in the case of decimal field
max_digits = model_field.max_digits
decimal_places = model_field.decimal_places
if field_class == models.CharField:
# must bring over max length in case of char field
max_length = model_field.max_length
break
if field_class is None:
raise Exception("Field {} could not be found in class {}".format(f, self.TimeSeriesBaseModel.__name__))
fields[f] = field_class()
if field_class == models.DecimalField:
fields[f].max_digits = max_digits
fields[f].decimal_places = decimal_places
if field_class == models.CharField:
fields[f].max_length = max_length
for field_name, field_instance, function in self.time_series_functions:
fields[field_name] = field_instance
self.TimeSeriesModel = type(self.name, (models.Model,), fields)
# next make sure that the tables exist in the database. if not, build them.
from django.db import connection
try:
cursor = connection.cursor()
cursor.execute("SELECT * FROM {} LIMIT 1".format(self.name))
except ProgrammingError:
# Looks like the table doesn't exist! Let's build it!
from django.db import connection
from django.db.backends.base.schema import BaseDatabaseSchemaEditor
schema_editor = BaseDatabaseSchemaEditor(connection)
with schema_editor:
schema_editor.create_model(self.TimeSeriesModel)
