Created
June 7, 2017 20:33
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Migration fails when changing to single table inheritance
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| class MediaBase(Base): | |
| #: The table in the database | |
| __tablename__ = "mediabase" | |
| #: Database primary key for the row (running counter) | |
| id = Column(Integer, autoincrement=True, primary_key=True) | |
| # table inheritance | |
| media_type = Column(String(32), nullable=False) | |
| #: Publicly exposed non-guessable | |
| uuid = Column(UUID(as_uuid=True), default=uuid4) | |
| localizedname = Column(Unicode(128), default=None) | |
| #: url | |
| url = Column(Unicode(384), default=None) | |
| # full iso language-locale identifier i.e. zh-Hans-US | |
| language_id = Column(String(16), default=None) | |
| # name of the person presenting the material | |
| presenter_name = Column(Unicode(64), default=None) | |
| source_material = Column(Unicode(128), default=None) | |
| # table inheritance | |
| __mapper_args__ = {'polymorphic_on': media_type} | |
| def __repr__(self): | |
| """Shell and debugger presentation.""" | |
| return '{} ({}) {} <{}>'.format(self.localizedname, self.language_id, str(self.uuid), self.url) | |
| def __str__(self): | |
| """Python default and admin UI string presentation.""" | |
| return '{} ({}) presenter: {} source: {} <{}>'.format(self.localizedname, self.language_id, self.presenter_name, self.source_material, self.url) | |
| class MediaChapter(MediaBase): | |
| #: The table in the database | |
| __tablename__ = "mediachapter" | |
| __mapper_args__ = {'polymorphic_identity': 'chapter'} | |
| id = Column(Integer, ForeignKey('mediabase.id'), primary_key=True) | |
| #: Which chapter this media is part of | |
| chapter_id = Column(Integer, ForeignKey('chapter.id')) | |
| chapter = relationship("Chapter", back_populates="mediachapter") | |
"""MediaBase-MediaChapter subclassing
Revision ID: a00980918d75
Revises: e74ba4203098
Create Date: 2017-06-07 16:10:29.807437
"""
# revision identifiers, used by Alembic.
revision = 'a00980918d75'
down_revision = 'e74ba4203098'
branch_labels = None
depends_on = None
import datetime
import websauna.system.model.columns
from sqlalchemy.types import Text # Needed from proper creation of JSON fields as Alembic inserts astext_type=Text() row
from alembic import op
import sqlalchemy as sa
from sqlalchemy.dialects import postgresql
def upgrade():
# ### commands auto generated by Alembic - please adjust! ###
op.create_table('mediabase',
sa.Column('id', sa.Integer(), nullable=False),
sa.Column('media_type', sa.String(length=32), nullable=False),
sa.Column('uuid', postgresql.UUID(as_uuid=True), nullable=True),
sa.Column('localizedname', sa.Unicode(length=128), nullable=True),
sa.Column('url', sa.Unicode(length=384), nullable=True),
sa.Column('language_id', sa.String(length=16), nullable=True),
sa.Column('presenter_name', sa.Unicode(length=64), nullable=True),
sa.Column('source_material', sa.Unicode(length=128), nullable=True),
sa.PrimaryKeyConstraint('id', name=op.f('pk_mediabase'))
)
op.alter_column('group', 'created_at',
existing_type=postgresql.TIMESTAMP(timezone=True),
type_=websauna.system.model.columns.UTCDateTime(),
existing_nullable=True)
op.alter_column('group', 'updated_at',
existing_type=postgresql.TIMESTAMP(timezone=True),
type_=websauna.system.model.columns.UTCDateTime(),
existing_nullable=True)
op.create_foreign_key(op.f('fk_mediachapter_id_mediabase'), 'mediachapter', 'mediabase', ['id'], ['id'])
op.drop_column('mediachapter', 'source_material')
op.drop_column('mediachapter', 'presenter_name')
op.drop_column('mediachapter', 'localizedname')
op.drop_column('mediachapter', 'url')
op.drop_column('mediachapter', 'uuid')
op.drop_column('mediachapter', 'language_id')
op.alter_column('user_activation', 'created_at',
existing_type=postgresql.TIMESTAMP(timezone=True),
type_=websauna.system.model.columns.UTCDateTime(),
existing_nullable=True)
op.alter_column('user_activation', 'expires_at',
existing_type=postgresql.TIMESTAMP(timezone=True),
type_=websauna.system.model.columns.UTCDateTime(),
existing_nullable=False)
op.alter_column('user_activation', 'updated_at',
existing_type=postgresql.TIMESTAMP(timezone=True),
type_=websauna.system.model.columns.UTCDateTime(),
existing_nullable=True)
op.alter_column('users', 'activated_at',
existing_type=postgresql.TIMESTAMP(timezone=True),
type_=websauna.system.model.columns.UTCDateTime(),
existing_nullable=True)
op.alter_column('users', 'created_at',
existing_type=postgresql.TIMESTAMP(timezone=True),
type_=websauna.system.model.columns.UTCDateTime(),
existing_nullable=True)
op.alter_column('users', 'last_auth_sensitive_operation_at',
existing_type=postgresql.TIMESTAMP(timezone=True),
type_=websauna.system.model.columns.UTCDateTime(),
existing_nullable=True)
op.alter_column('users', 'last_login_at',
existing_type=postgresql.TIMESTAMP(timezone=True),
type_=websauna.system.model.columns.UTCDateTime(),
existing_nullable=True)
op.alter_column('users', 'updated_at',
existing_type=postgresql.TIMESTAMP(timezone=True),
type_=websauna.system.model.columns.UTCDateTime(),
existing_nullable=True)
# ### end Alembic commands ###
def downgrade():
# ### commands auto generated by Alembic - please adjust! ###
op.alter_column('users', 'updated_at',
existing_type=websauna.system.model.columns.UTCDateTime(),
type_=postgresql.TIMESTAMP(timezone=True),
existing_nullable=True)
op.alter_column('users', 'last_login_at',
existing_type=websauna.system.model.columns.UTCDateTime(),
type_=postgresql.TIMESTAMP(timezone=True),
existing_nullable=True)
op.alter_column('users', 'last_auth_sensitive_operation_at',
existing_type=websauna.system.model.columns.UTCDateTime(),
type_=postgresql.TIMESTAMP(timezone=True),
existing_nullable=True)
op.alter_column('users', 'created_at',
existing_type=websauna.system.model.columns.UTCDateTime(),
type_=postgresql.TIMESTAMP(timezone=True),
existing_nullable=True)
op.alter_column('users', 'activated_at',
existing_type=websauna.system.model.columns.UTCDateTime(),
type_=postgresql.TIMESTAMP(timezone=True),
existing_nullable=True)
op.alter_column('user_activation', 'updated_at',
existing_type=websauna.system.model.columns.UTCDateTime(),
type_=postgresql.TIMESTAMP(timezone=True),
existing_nullable=True)
op.alter_column('user_activation', 'expires_at',
existing_type=websauna.system.model.columns.UTCDateTime(),
type_=postgresql.TIMESTAMP(timezone=True),
existing_nullable=False)
op.alter_column('user_activation', 'created_at',
existing_type=websauna.system.model.columns.UTCDateTime(),
type_=postgresql.TIMESTAMP(timezone=True),
existing_nullable=True)
op.add_column('mediachapter', sa.Column('language_id', sa.VARCHAR(length=16), autoincrement=False, nullable=True))
op.add_column('mediachapter', sa.Column('uuid', postgresql.UUID(), autoincrement=False, nullable=True))
op.add_column('mediachapter', sa.Column('url', sa.VARCHAR(length=384), autoincrement=False, nullable=True))
op.add_column('mediachapter', sa.Column('localizedname', sa.VARCHAR(length=128), autoincrement=False, nullable=True))
op.add_column('mediachapter', sa.Column('presenter_name', sa.VARCHAR(length=64), autoincrement=False, nullable=True))
op.add_column('mediachapter', sa.Column('source_material', sa.VARCHAR(length=128), autoincrement=False, nullable=True))
op.drop_constraint(op.f('fk_mediachapter_id_mediabase'), 'mediachapter', type_='foreignkey')
op.alter_column('group', 'updated_at',
existing_type=websauna.system.model.columns.UTCDateTime(),
type_=postgresql.TIMESTAMP(timezone=True),
existing_nullable=True)
op.alter_column('group', 'created_at',
existing_type=websauna.system.model.columns.UTCDateTime(),
type_=postgresql.TIMESTAMP(timezone=True),
existing_nullable=True)
op.drop_table('mediabase')
# ### end Alembic commands ###
class Chapter(Base):
#: The table in the database
__tablename__ = "chapter"
#: Database primary key for the row (running counter)
id = Column(Integer, autoincrement=True, primary_key=True)
absolute_id = Column(Integer)
#: Publicly exposed non-guessable id
uuid = Column(UUID(as_uuid=True), default=uuid4)
basename = Column(Unicode(64), default=None)
book_id = Column(Integer, ForeignKey('book.id'))
book = relationship("Book", back_populates="chapters")
#: Relationship mapping between mediachapter and chapter.
#: Each mediachapter can have only one chapter.
#: Deleting chapter deletes its mediachapter.
mediachapter = relationship("MediaChapter",
back_populates="chapter",
lazy="dynamic",
cascade="all, delete-orphan",
single_parent=True)
def __repr__(self):
"""Shell and debugger presentation."""
return "{} {}".format(self.book.basename, self.id)
def __str__(self):
"""Python default and admin UI string presentation."""
if hasattr(self.book, 'basename'):
return "{} {}".format(self.book.basename, self.absolute_id)
else:
return "{} {}".format('(not set)', self.absolute_id)
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Upon calling
ws-alembic -c kjvrvg/conf/development.ini -x packages=all upgrade head