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indexes.py 0000644 00000017673 15030264251 0006571 0 ustar 00 from django.db import NotSupportedError from django.db.models import Func, Index from django.utils.functional import cached_property __all__ = [ "BloomIndex", "BrinIndex", "BTreeIndex", "GinIndex", "GistIndex", "HashIndex", "SpGistIndex", ] 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="", **kwargs): self.check_supported(schema_editor) statement = super().create_sql( model, schema_editor, using=" USING %s" % (using or self.suffix), **kwargs ) with_params = self.get_with_params() if with_params: statement.parts["extra"] = " WITH (%s)%s" % ( ", ".join(with_params), statement.parts["extra"], ) return statement def check_supported(self, schema_editor): pass def get_with_params(self): return [] class BloomIndex(PostgresIndex): suffix = "bloom" def __init__(self, *expressions, length=None, columns=(), **kwargs): super().__init__(*expressions, **kwargs) if len(self.fields) > 32: raise ValueError("Bloom indexes support a maximum of 32 fields.") if not isinstance(columns, (list, tuple)): raise ValueError("BloomIndex.columns must be a list or tuple.") if len(columns) > len(self.fields): raise ValueError("BloomIndex.columns cannot have more values than fields.") if not all(0 < col <= 4095 for col in columns): raise ValueError( "BloomIndex.columns must contain integers from 1 to 4095.", ) if length is not None and not 0 < length <= 4096: raise ValueError( "BloomIndex.length must be None or an integer from 1 to 4096.", ) self.length = length self.columns = columns def deconstruct(self): path, args, kwargs = super().deconstruct() if self.length is not None: kwargs["length"] = self.length if self.columns: kwargs["columns"] = self.columns return path, args, kwargs def get_with_params(self): with_params = [] if self.length is not None: with_params.append("length = %d" % self.length) if self.columns: with_params.extend( "col%d = %d" % (i, v) for i, v in enumerate(self.columns, start=1) ) return with_params class BrinIndex(PostgresIndex): suffix = "brin" def __init__( self, *expressions, autosummarize=None, 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.autosummarize = autosummarize self.pages_per_range = pages_per_range super().__init__(*expressions, **kwargs) def deconstruct(self): path, args, kwargs = super().deconstruct() if self.autosummarize is not None: kwargs["autosummarize"] = self.autosummarize 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.autosummarize is not None: with_params.append( "autosummarize = %s" % ("on" if self.autosummarize else "off") ) if self.pages_per_range is not None: with_params.append("pages_per_range = %d" % self.pages_per_range) return with_params class BTreeIndex(PostgresIndex): suffix = "btree" def __init__(self, *expressions, fillfactor=None, **kwargs): self.fillfactor = fillfactor super().__init__(*expressions, **kwargs) def deconstruct(self): path, args, kwargs = super().deconstruct() if self.fillfactor is not None: kwargs["fillfactor"] = self.fillfactor return path, args, kwargs def get_with_params(self): with_params = [] if self.fillfactor is not None: with_params.append("fillfactor = %d" % self.fillfactor) return with_params class GinIndex(PostgresIndex): suffix = "gin" def __init__( self, *expressions, fastupdate=None, gin_pending_list_limit=None, **kwargs ): self.fastupdate = fastupdate self.gin_pending_list_limit = gin_pending_list_limit super().__init__(*expressions, **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 class GistIndex(PostgresIndex): suffix = "gist" def __init__(self, *expressions, buffering=None, fillfactor=None, **kwargs): self.buffering = buffering self.fillfactor = fillfactor super().__init__(*expressions, **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 class HashIndex(PostgresIndex): suffix = "hash" def __init__(self, *expressions, fillfactor=None, **kwargs): self.fillfactor = fillfactor super().__init__(*expressions, **kwargs) def deconstruct(self): path, args, kwargs = super().deconstruct() if self.fillfactor is not None: kwargs["fillfactor"] = self.fillfactor return path, args, kwargs def get_with_params(self): with_params = [] if self.fillfactor is not None: with_params.append("fillfactor = %d" % self.fillfactor) return with_params class SpGistIndex(PostgresIndex): suffix = "spgist" def __init__(self, *expressions, fillfactor=None, **kwargs): self.fillfactor = fillfactor super().__init__(*expressions, **kwargs) def deconstruct(self): path, args, kwargs = super().deconstruct() if self.fillfactor is not None: kwargs["fillfactor"] = self.fillfactor return path, args, kwargs def get_with_params(self): with_params = [] if self.fillfactor is not None: with_params.append("fillfactor = %d" % self.fillfactor) return with_params def check_supported(self, schema_editor): if ( self.include and not schema_editor.connection.features.supports_covering_spgist_indexes ): raise NotSupportedError("Covering SP-GiST indexes require PostgreSQL 14+.") class OpClass(Func): template = "%(expressions)s %(name)s" def __init__(self, expression, name): super().__init__(expression, name=name) lookups.py 0000644 00000003707 15030264251 0006617 0 ustar 00 from django.db.models import Transform from django.db.models.lookups import PostgresOperatorLookup from django.db.models.sql.query import Query from .search import SearchVector, SearchVectorExact, SearchVectorField class DataContains(PostgresOperatorLookup): lookup_name = "contains" postgres_operator = "@>" class ContainedBy(PostgresOperatorLookup): lookup_name = "contained_by" postgres_operator = "<@" class Overlap(PostgresOperatorLookup): lookup_name = "overlap" postgres_operator = "&&" def get_prep_lookup(self): from .expressions import ArraySubquery if isinstance(self.rhs, Query): self.rhs = ArraySubquery(self.rhs) return super().get_prep_lookup() class HasKey(PostgresOperatorLookup): lookup_name = "has_key" postgres_operator = "?" prepare_rhs = False class HasKeys(PostgresOperatorLookup): lookup_name = "has_keys" postgres_operator = "?&" def get_prep_lookup(self): return [str(item) for item in self.rhs] class HasAnyKeys(HasKeys): lookup_name = "has_any_keys" postgres_operator = "?|" class Unaccent(Transform): bilateral = True lookup_name = "unaccent" function = "UNACCENT" class SearchLookup(SearchVectorExact): lookup_name = "search" def process_lhs(self, qn, connection): if not isinstance(self.lhs.output_field, SearchVectorField): config = getattr(self.rhs, "config", None) self.lhs = SearchVector(self.lhs, config=config) lhs, lhs_params = super().process_lhs(qn, connection) return lhs, lhs_params class TrigramSimilar(PostgresOperatorLookup): lookup_name = "trigram_similar" postgres_operator = "%%" class TrigramWordSimilar(PostgresOperatorLookup): lookup_name = "trigram_word_similar" postgres_operator = "%%>" class TrigramStrictWordSimilar(PostgresOperatorLookup): lookup_name = "trigram_strict_word_similar" postgres_operator = "%%>>" constraints.py 0000644 00000023421 15030264251 0007465 0 ustar 00 import warnings from django.contrib.postgres.indexes import OpClass from django.core.exceptions import ValidationError from django.db import DEFAULT_DB_ALIAS, NotSupportedError from django.db.backends.ddl_references import Expressions, Statement, Table from django.db.models import BaseConstraint, Deferrable, F, Q from django.db.models.expressions import Exists, ExpressionList from django.db.models.indexes import IndexExpression from django.db.models.lookups import PostgresOperatorLookup from django.db.models.sql import Query from django.utils.deprecation import RemovedInDjango50Warning __all__ = ["ExclusionConstraint"] class ExclusionConstraintExpression(IndexExpression): template = "%(expressions)s WITH %(operator)s" class ExclusionConstraint(BaseConstraint): template = ( "CONSTRAINT %(name)s EXCLUDE USING %(index_type)s " "(%(expressions)s)%(include)s%(where)s%(deferrable)s" ) def __init__( self, *, name, expressions, index_type=None, condition=None, deferrable=None, include=None, opclasses=(), violation_error_message=None, ): if index_type and index_type.lower() not in {"gist", "spgist"}: raise ValueError( "Exclusion constraints only support GiST or SP-GiST indexes." ) if not expressions: raise ValueError( "At least one expression is required to define an exclusion " "constraint." ) if not all( isinstance(expr, (list, tuple)) and len(expr) == 2 for expr in expressions ): raise ValueError("The expressions must be a list of 2-tuples.") if not isinstance(condition, (type(None), Q)): raise ValueError("ExclusionConstraint.condition must be a Q instance.") if not isinstance(deferrable, (type(None), Deferrable)): raise ValueError( "ExclusionConstraint.deferrable must be a Deferrable instance." ) if not isinstance(include, (type(None), list, tuple)): raise ValueError("ExclusionConstraint.include must be a list or tuple.") if not isinstance(opclasses, (list, tuple)): raise ValueError("ExclusionConstraint.opclasses must be a list or tuple.") if opclasses and len(expressions) != len(opclasses): raise ValueError( "ExclusionConstraint.expressions and " "ExclusionConstraint.opclasses must have the same number of " "elements." ) self.expressions = expressions self.index_type = index_type or "GIST" self.condition = condition self.deferrable = deferrable self.include = tuple(include) if include else () self.opclasses = opclasses if self.opclasses: warnings.warn( "The opclasses argument is deprecated in favor of using " "django.contrib.postgres.indexes.OpClass in " "ExclusionConstraint.expressions.", category=RemovedInDjango50Warning, stacklevel=2, ) super().__init__(name=name, violation_error_message=violation_error_message) def _get_expressions(self, schema_editor, query): expressions = [] for idx, (expression, operator) in enumerate(self.expressions): if isinstance(expression, str): expression = F(expression) try: expression = OpClass(expression, self.opclasses[idx]) except IndexError: pass expression = ExclusionConstraintExpression(expression, operator=operator) expression.set_wrapper_classes(schema_editor.connection) expressions.append(expression) return ExpressionList(*expressions).resolve_expression(query) def _get_condition_sql(self, compiler, schema_editor, query): if self.condition is None: return None where = query.build_where(self.condition) sql, params = where.as_sql(compiler, schema_editor.connection) return sql % tuple(schema_editor.quote_value(p) for p in params) def constraint_sql(self, model, schema_editor): query = Query(model, alias_cols=False) compiler = query.get_compiler(connection=schema_editor.connection) expressions = self._get_expressions(schema_editor, query) table = model._meta.db_table condition = self._get_condition_sql(compiler, schema_editor, query) include = [ model._meta.get_field(field_name).column for field_name in self.include ] return Statement( self.template, table=Table(table, schema_editor.quote_name), name=schema_editor.quote_name(self.name), index_type=self.index_type, expressions=Expressions( table, expressions, compiler, schema_editor.quote_value ), where=" WHERE (%s)" % condition if condition else "", include=schema_editor._index_include_sql(model, include), deferrable=schema_editor._deferrable_constraint_sql(self.deferrable), ) def create_sql(self, model, schema_editor): self.check_supported(schema_editor) return Statement( "ALTER TABLE %(table)s ADD %(constraint)s", table=Table(model._meta.db_table, schema_editor.quote_name), constraint=self.constraint_sql(model, schema_editor), ) def remove_sql(self, model, schema_editor): return schema_editor._delete_constraint_sql( schema_editor.sql_delete_check, model, schema_editor.quote_name(self.name), ) def check_supported(self, schema_editor): if ( self.include and self.index_type.lower() == "spgist" and not schema_editor.connection.features.supports_covering_spgist_indexes ): raise NotSupportedError( "Covering exclusion constraints using an SP-GiST index " "require PostgreSQL 14+." ) def deconstruct(self): path, args, kwargs = super().deconstruct() kwargs["expressions"] = self.expressions if self.condition is not None: kwargs["condition"] = self.condition if self.index_type.lower() != "gist": kwargs["index_type"] = self.index_type if self.deferrable: kwargs["deferrable"] = self.deferrable if self.include: kwargs["include"] = self.include if self.opclasses: kwargs["opclasses"] = self.opclasses return path, args, kwargs def __eq__(self, other): if isinstance(other, self.__class__): return ( self.name == other.name and self.index_type == other.index_type and self.expressions == other.expressions and self.condition == other.condition and self.deferrable == other.deferrable and self.include == other.include and self.opclasses == other.opclasses and self.violation_error_message == other.violation_error_message ) return super().__eq__(other) def __repr__(self): return "<%s: index_type=%s expressions=%s name=%s%s%s%s%s>" % ( self.__class__.__qualname__, repr(self.index_type), repr(self.expressions), repr(self.name), "" if self.condition is None else " condition=%s" % self.condition, "" if self.deferrable is None else " deferrable=%r" % self.deferrable, "" if not self.include else " include=%s" % repr(self.include), "" if not self.opclasses else " opclasses=%s" % repr(self.opclasses), ) def validate(self, model, instance, exclude=None, using=DEFAULT_DB_ALIAS): queryset = model._default_manager.using(using) replacement_map = instance._get_field_value_map( meta=model._meta, exclude=exclude ) replacements = {F(field): value for field, value in replacement_map.items()} lookups = [] for idx, (expression, operator) in enumerate(self.expressions): if isinstance(expression, str): expression = F(expression) if exclude: if isinstance(expression, F): if expression.name in exclude: return else: for expr in expression.flatten(): if isinstance(expr, F) and expr.name in exclude: return rhs_expression = expression.replace_expressions(replacements) # Remove OpClass because it only has sense during the constraint # creation. if isinstance(expression, OpClass): expression = expression.get_source_expressions()[0] if isinstance(rhs_expression, OpClass): rhs_expression = rhs_expression.get_source_expressions()[0] lookup = PostgresOperatorLookup(lhs=expression, rhs=rhs_expression) lookup.postgres_operator = operator lookups.append(lookup) queryset = queryset.filter(*lookups) model_class_pk = instance._get_pk_val(model._meta) if not instance._state.adding and model_class_pk is not None: queryset = queryset.exclude(pk=model_class_pk) if not self.condition: if queryset.exists(): raise ValidationError(self.get_violation_error_message()) else: if (self.condition & Exists(queryset.filter(self.condition))).check( replacement_map, using=using ): raise ValidationError(self.get_violation_error_message()) __pycache__/operations.cpython-310.pyc 0000644 00000031262 15030264251 0013642 0 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