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from django.db.models import Index
__all__ = ['BrinIndex', 'GinIndex', 'GistIndex']
class MaxLengthMixin:
# Allow an index name longer than 30 characters since the suffix is 4
# characters (usual limit is 3). Since this index can only be used on
# PostgreSQL, the 30 character limit for cross-database compatibility isn't
# applicable.
max_name_length = 31
class BrinIndex(MaxLengthMixin, Index):
suffix = 'brin'
def __init__(self, *, pages_per_range=None, **kwargs):
if pages_per_range is not None and pages_per_range <= 0:
raise ValueError('pages_per_range must be None or a positive integer')
self.pages_per_range = pages_per_range
super().__init__(**kwargs)
def deconstruct(self):
path, args, kwargs = super().deconstruct()
if self.pages_per_range is not None:
kwargs['pages_per_range'] = self.pages_per_range
return path, args, kwargs
def create_sql(self, model, schema_editor, using=''):
statement = super().create_sql(model, schema_editor, using=' USING brin')
if self.pages_per_range is not None:
statement.parts['extra'] = ' WITH (pages_per_range={})'.format(
schema_editor.quote_value(self.pages_per_range)
) + statement.parts['extra']
return statement
class GinIndex(Index):
suffix = 'gin'
def __init__(self, *, fastupdate=None, gin_pending_list_limit=None, **kwargs):
self.fastupdate = fastupdate
self.gin_pending_list_limit = gin_pending_list_limit
super().__init__(**kwargs)
def deconstruct(self):
path, args, kwargs = super().deconstruct()
if self.fastupdate is not None:
kwargs['fastupdate'] = self.fastupdate
if self.gin_pending_list_limit is not None:
kwargs['gin_pending_list_limit'] = self.gin_pending_list_limit
return path, args, kwargs
def create_sql(self, model, schema_editor, using=''):
statement = super().create_sql(model, schema_editor, using=' USING gin')
with_params = []
if self.gin_pending_list_limit is not None:
with_params.append('gin_pending_list_limit = %d' % self.gin_pending_list_limit)
if self.fastupdate is not None:
with_params.append('fastupdate = {}'.format('on' if self.fastupdate else 'off'))
if with_params:
statement.parts['extra'] = 'WITH ({}) {}'.format(', '.join(with_params), statement.parts['extra'])
return statement
class GistIndex(MaxLengthMixin, Index):
suffix = 'gist'
def __init__(self, *, buffering=None, fillfactor=None, **kwargs):
self.buffering = buffering
self.fillfactor = fillfactor
super().__init__(**kwargs)
def deconstruct(self):
path, args, kwargs = super().deconstruct()
if self.buffering is not None:
kwargs['buffering'] = self.buffering
if self.fillfactor is not None:
kwargs['fillfactor'] = self.fillfactor
return path, args, kwargs
def create_sql(self, model, schema_editor):
statement = super().create_sql(model, schema_editor, using=' USING gist')
with_params = []
if self.buffering is not None:
with_params.append('buffering = {}'.format('on' if self.buffering else 'off'))
if self.fillfactor is not None:
with_params.append('fillfactor = %s' % self.fillfactor)
if with_params:
statement.parts['extra'] = 'WITH ({}) {}'.format(', '.join(with_params), statement.parts['extra'])
return statement
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