superset 2016-05-27_15-03_1226819ee0e3_fix_wrong_constraint_on_table_columns 源码
superset 2016-05-27_15-03_1226819ee0e3_fix_wrong_constraint_on_table_columns 代码
文件路径：/superset/migrations/versions/2016-05-27_15-03_1226819ee0e3_fix_wrong_constraint_on_table_columns.py
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# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
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#
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"""Fix wrong constraint on table columns
Revision ID: 1226819ee0e3
Revises: 956a063c52b3
Create Date: 2016-05-27 15:03:32.980343
"""
import logging
from alembic import op
from superset import db
from superset.utils.core import generic_find_constraint_name
# revision identifiers, used by Alembic.
revision = "1226819ee0e3"
down_revision = "956a063c52b3"
naming_convention = {
"fk": "fk_%(table_name)s_%(column_0_name)s_%(referred_table_name)s"
}
def find_constraint_name(upgrade=True):
cols = {"column_name"} if upgrade else {"datasource_name"}
return generic_find_constraint_name(
table="columns", columns=cols, referenced="datasources", database=db
)
def upgrade():
try:
constraint = find_constraint_name()
with op.batch_alter_table(
"columns", naming_convention=naming_convention
) as batch_op:
if constraint:
batch_op.drop_constraint(constraint, type_="foreignkey")
batch_op.create_foreign_key(
"fk_columns_datasource_name_datasources",
"datasources",
["datasource_name"],
["datasource_name"],
)
except:
logging.warning("Could not find or drop constraint on `columns`")
def downgrade():
constraint = find_constraint_name(False) or "fk_columns_datasource_name_datasources"
with op.batch_alter_table(
"columns", naming_convention=naming_convention
) as batch_op:
batch_op.drop_constraint(constraint, type_="foreignkey")
batch_op.create_foreign_key(
"fk_columns_column_name_datasources",
"datasources",
["column_name"],
["datasource_name"],
)
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