superset 2018-03-20_19-47_f231d82b9b26_ 源码
superset 2018-03-20_19-47f231d82b9b26 代码
文件路径：/superset/migrations/versions/2018-03-20_19-47f231d82b9b26.py
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# to you under the Apache License, Version 2.0 (the
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#
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"""empty message
Revision ID: f231d82b9b26
Revises: e68c4473c581
Create Date: 2018-03-20 19:47:54.991259
"""
import sqlalchemy as sa
from alembic import op
from superset.utils.core import generic_find_uq_constraint_name
# revision identifiers, used by Alembic.
revision = "f231d82b9b26"
down_revision = "e68c4473c581"
conv = {"uq": "uq_%(table_name)s_%(column_0_name)s"}
names = {"columns": "column_name", "metrics": "metric_name"}
def upgrade():
# Reduce the size of the metric_name column for constraint viability.
with op.batch_alter_table("metrics", naming_convention=conv) as batch_op:
batch_op.alter_column(
"metric_name",
existing_type=sa.String(length=512),
type_=sa.String(length=255),
existing_nullable=True,
)
# Add the missing uniqueness constraints.
for table, column in names.items():
with op.batch_alter_table(table, naming_convention=conv) as batch_op:
batch_op.create_unique_constraint(
"uq_{}_{}".format(table, column), [column, "datasource_id"]
)
def downgrade():
bind = op.get_bind()
insp = sa.engine.reflection.Inspector.from_engine(bind)
# Restore the size of the metric_name column.
with op.batch_alter_table("metrics", naming_convention=conv) as batch_op:
batch_op.alter_column(
"metric_name",
existing_type=sa.String(length=255),
type_=sa.String(length=512),
existing_nullable=True,
)
# Remove the previous missing uniqueness constraints.
for table, column in names.items():
with op.batch_alter_table(table, naming_convention=conv) as batch_op:
batch_op.drop_constraint(
generic_find_uq_constraint_name(table, {column, "datasource_id"}, insp)
or "uq_{}_{}".format(table, column),
type_="unique",
)
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