Source code for django.contrib.postgres.indexes

from __future__ import unicode_literals

from django.db.models import Index

__all__ = ['BrinIndex', 'GinIndex']

[docs]class BrinIndex(Index): suffix = 'brin' # 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 def __init__(self, fields=[], name=None, pages_per_range=None): 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(BrinIndex, self).__init__(fields, name) def __repr__(self): if self.pages_per_range is not None: return '<%(name)s: fields=%(fields)s, pages_per_range=%(pages_per_range)s>' % { 'name': self.__class__.__name__, 'fields': "'{}'".format(', '.join(self.fields)), 'pages_per_range': self.pages_per_range, } else: return super(BrinIndex, self).__repr__() def deconstruct(self): path, args, kwargs = super(BrinIndex, self).deconstruct() if self.pages_per_range is not None: kwargs['pages_per_range'] = self.pages_per_range return path, args, kwargs def get_sql_create_template_values(self, model, schema_editor, using): parameters = super(BrinIndex, self).get_sql_create_template_values(model, schema_editor, using=' USING brin') if self.pages_per_range is not None: parameters['extra'] = ' WITH (pages_per_range={})'.format( schema_editor.quote_value(self.pages_per_range)) + parameters['extra'] return parameters
[docs]class GinIndex(Index): suffix = 'gin' def create_sql(self, model, schema_editor): return super(GinIndex, self).create_sql(model, schema_editor, using=' USING gin')
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