• Language: en

Source code for django.contrib.postgres.indexes

from django.db.models import Index
from django.utils.functional import cached_property

__all__ = ['BrinIndex', 'GinIndex', 'GistIndex']


class PostgresIndex(Index):

    @cached_property
    def max_name_length(self):
        # Allow an index name longer than 30 characters when the suffix is
        # longer than the usual 3 character limit. The 30 character limit for
        # cross-database compatibility isn't applicable to PostgreSQL-specific
        # indexes.
        return Index.max_name_length - len(Index.suffix) + len(self.suffix)

    def create_sql(self, model, schema_editor, using=''):
        statement = super().create_sql(model, schema_editor, using=' USING %s' % self.suffix)
        with_params = self.get_with_params()
        if with_params:
            statement.parts['extra'] = 'WITH (%s) %s' % (
                ', '.join(with_params),
                statement.parts['extra'],
            )
        return statement

    def get_with_params(self):
        return []


[docs]class BrinIndex(PostgresIndex): 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 get_with_params(self): with_params = [] if self.pages_per_range is not None: with_params.append('pages_per_range = %d' % self.pages_per_range) return with_params
[docs]class GinIndex(PostgresIndex): 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 get_with_params(self): 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 = %s' % ('on' if self.fastupdate else 'off')) return with_params
[docs]class GistIndex(PostgresIndex): 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 get_with_params(self): with_params = [] if self.buffering is not None: with_params.append('buffering = %s' % ('on' if self.buffering else 'off')) if self.fillfactor is not None: with_params.append('fillfactor = %d' % self.fillfactor) return with_params
Back to Top