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schemaobj.py
from __future__ import annotations from typing import Any from typing import Dict from typing import List from typing import Optional from typing import Sequence from typing import Tuple from typing import TYPE_CHECKING from typing import Union from sqlalchemy import schema as sa_schema from sqlalchemy.sql.schema import Column from sqlalchemy.sql.schema import Constraint from sqlalchemy.sql.schema import Index from sqlalchemy.types import Integer from sqlalchemy.types import NULLTYPE from .. import util from ..util import sqla_compat if TYPE_CHECKING: from sqlalchemy.sql.elements import ColumnElement from sqlalchemy.sql.elements import TextClause from sqlalchemy.sql.schema import CheckConstraint from sqlalchemy.sql.schema import ForeignKey from sqlalchemy.sql.schema import ForeignKeyConstraint from sqlalchemy.sql.schema import MetaData from sqlalchemy.sql.schema import PrimaryKeyConstraint from sqlalchemy.sql.schema import Table from sqlalchemy.sql.schema import UniqueConstraint from sqlalchemy.sql.type_api import TypeEngine from ..runtime.migration import MigrationContext class SchemaObjects: def __init__( self, migration_context: Optional[MigrationContext] = None ) -> None: self.migration_context = migration_context def primary_key_constraint( self, name: Optional[sqla_compat._ConstraintNameDefined], table_name: str, cols: Sequence[str], schema: Optional[str] = None, **dialect_kw, ) -> PrimaryKeyConstraint: m = self.metadata() columns = [sa_schema.Column(n, NULLTYPE) for n in cols] t = sa_schema.Table(table_name, m, *columns, schema=schema) # SQLAlchemy primary key constraint name arg is wrongly typed on # the SQLAlchemy side through 2.0.5 at least p = sa_schema.PrimaryKeyConstraint( *[t.c[n] for n in cols], name=name, **dialect_kw # type: ignore ) return p def foreign_key_constraint( self, name: Optional[sqla_compat._ConstraintNameDefined], source: str, referent: str, local_cols: List[str], remote_cols: List[str], onupdate: Optional[str] = None, ondelete: Optional[str] = None, deferrable: Optional[bool] = None, source_schema: Optional[str] = None, referent_schema: Optional[str] = None, initially: Optional[str] = None, match: Optional[str] = None, **dialect_kw, ) -> ForeignKeyConstraint: m = self.metadata() if source == referent and source_schema == referent_schema: t1_cols = local_cols + remote_cols else: t1_cols = local_cols sa_schema.Table( referent, m, *[sa_schema.Column(n, NULLTYPE) for n in remote_cols], schema=referent_schema, ) t1 = sa_schema.Table( source, m, *[ sa_schema.Column(n, NULLTYPE) for n in util.unique_list(t1_cols) ], schema=source_schema, ) tname = ( "%s.%s" % (referent_schema, referent) if referent_schema else referent ) dialect_kw["match"] = match f = sa_schema.ForeignKeyConstraint( local_cols, ["%s.%s" % (tname, n) for n in remote_cols], name=name, onupdate=onupdate, ondelete=ondelete, deferrable=deferrable, initially=initially, **dialect_kw, ) t1.append_constraint(f) return f def unique_constraint( self, name: Optional[sqla_compat._ConstraintNameDefined], source: str, local_cols: Sequence[str], schema: Optional[str] = None, **kw, ) -> UniqueConstraint: t = sa_schema.Table( source, self.metadata(), *[sa_schema.Column(n, NULLTYPE) for n in local_cols], schema=schema, ) kw["name"] = name uq = sa_schema.UniqueConstraint(*[t.c[n] for n in local_cols], **kw) # TODO: need event tests to ensure the event # is fired off here t.append_constraint(uq) return uq def check_constraint( self, name: Optional[sqla_compat._ConstraintNameDefined], source: str, condition: Union[str, TextClause, ColumnElement[Any]], schema: Optional[str] = None, **kw, ) -> Union[CheckConstraint]: t = sa_schema.Table( source, self.metadata(), sa_schema.Column("x", Integer), schema=schema, ) ck = sa_schema.CheckConstraint(condition, name=name, **kw) t.append_constraint(ck) return ck def generic_constraint( self, name: Optional[sqla_compat._ConstraintNameDefined], table_name: str, type_: Optional[str], schema: Optional[str] = None, **kw, ) -> Any: t = self.table(table_name, schema=schema) types: Dict[Optional[str], Any] = { "foreignkey": lambda name: sa_schema.ForeignKeyConstraint( [], [], name=name ), "primary": sa_schema.PrimaryKeyConstraint, "unique": sa_schema.UniqueConstraint, "check": lambda name: sa_schema.CheckConstraint("", name=name), None: sa_schema.Constraint, } try: const = types[type_] except KeyError as ke: raise TypeError( "'type' can be one of %s" % ", ".join(sorted(repr(x) for x in types)) ) from ke else: const = const(name=name) t.append_constraint(const) return const def metadata(self) -> MetaData: kw = {} if ( self.migration_context is not None and "target_metadata" in self.migration_context.opts ): mt = self.migration_context.opts["target_metadata"] if hasattr(mt, "naming_convention"): kw["naming_convention"] = mt.naming_convention return sa_schema.MetaData(**kw) def table(self, name: str, *columns, **kw) -> Table: m = self.metadata() cols = [ sqla_compat._copy(c) if c.table is not None else c for c in columns if isinstance(c, Column) ] # these flags have already added their UniqueConstraint / # Index objects to the table, so flip them off here. # SQLAlchemy tometadata() avoids this instead by preserving the # flags and skipping the constraints that have _type_bound on them, # but for a migration we'd rather list out the constraints # explicitly. _constraints_included = kw.pop("_constraints_included", False) if _constraints_included: for c in cols: c.unique = c.index = False t = sa_schema.Table(name, m, *cols, **kw) constraints = [ sqla_compat._copy(elem, target_table=t) if getattr(elem, "parent", None) is not t and getattr(elem, "parent", None) is not None else elem for elem in columns if isinstance(elem, (Constraint, Index)) ] for const in constraints: t.append_constraint(const) for f in t.foreign_keys: self._ensure_table_for_fk(m, f) return t def column(self, name: str, type_: TypeEngine, **kw) -> Column: return sa_schema.Column(name, type_, **kw) def index( self, name: Optional[str], tablename: Optional[str], columns: Sequence[Union[str, TextClause, ColumnElement[Any]]], schema: Optional[str] = None, **kw, ) -> Index: t = sa_schema.Table( tablename or "no_table", self.metadata(), schema=schema, ) kw["_table"] = t idx = sa_schema.Index( name, *[util.sqla_compat._textual_index_column(t, n) for n in columns], **kw, ) return idx def _parse_table_key(self, table_key: str) -> Tuple[Optional[str], str]: if "." in table_key: tokens = table_key.split(".") sname: Optional[str] = ".".join(tokens[0:-1]) tname = tokens[-1] else: tname = table_key sname = None return (sname, tname) def _ensure_table_for_fk(self, metadata: MetaData, fk: ForeignKey) -> None: """create a placeholder Table object for the referent of a ForeignKey. """ if isinstance(fk._colspec, str): # type:ignore[attr-defined] table_key, cname = fk._colspec.rsplit( # type:ignore[attr-defined] ".", 1 ) sname, tname = self._parse_table_key(table_key) if table_key not in metadata.tables: rel_t = sa_schema.Table(tname, metadata, schema=sname) else: rel_t = metadata.tables[table_key] if cname not in rel_t.c: rel_t.append_column(sa_schema.Column(cname, NULLTYPE))
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