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utils: generalize utility to find find_constraint_name (#557)
See https://github.com/airbnb/caravel/pull/531
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@ -12,27 +12,16 @@ down_revision = '956a063c52b3'
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from alembic import op
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from alembic import op
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import sqlalchemy as sa
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import sqlalchemy as sa
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from caravel.utils import generic_find_constraint_name
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naming_convention = {
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naming_convention = {
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"fk":
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"fk":
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"fk_%(table_name)s_%(column_0_name)s_%(referred_table_name)s",
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"fk_%(table_name)s_%(column_0_name)s_%(referred_table_name)s",
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}
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}
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def find_constraint_name(upgrade = True):
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def find_constraint_name(upgrade=True):
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__table = 'columns'
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cols = {'column_name'} if upgrade else {'datasource_name'}
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__cols = {'column_name'} if upgrade else {'datasource_name'}
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return generic_find_constraint_name(table='columns', columns=cols, referenced='datasources')
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__referenced = 'datasources'
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__ref_cols = {'datasource_name'} if upgrade else {'column_name'}
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engine = op.get_bind().engine
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m = sa.MetaData({})
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t=sa.Table(__table,m, autoload=True, autoload_with=engine)
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for fk in t.foreign_key_constraints:
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if fk.referred_table.name == __referenced and \
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set(fk.column_keys) == __cols:
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return fk.name
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return None
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def upgrade():
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def upgrade():
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constraint = find_constraint_name() or 'fk_columns_column_name_datasources'
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constraint = find_constraint_name() or 'fk_columns_column_name_datasources'
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@ -47,4 +36,3 @@ def downgrade():
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naming_convention=naming_convention) as batch_op:
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naming_convention=naming_convention) as batch_op:
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batch_op.drop_constraint(constraint, type_="foreignkey")
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batch_op.drop_constraint(constraint, type_="foreignkey")
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batch_op.create_foreign_key('fk_columns_column_name_datasources', 'datasources', ['column_name'], ['datasource_name'])
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batch_op.create_foreign_key('fk_columns_column_name_datasources', 'datasources', ['column_name'], ['datasource_name'])
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@ -11,7 +11,9 @@ import numpy
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from datetime import datetime
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from datetime import datetime
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import parsedatetime
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import parsedatetime
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import sqlalchemy as sa
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from dateutil.parser import parse
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from dateutil.parser import parse
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from alembic import op
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from flask import flash, Markup
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from flask import flash, Markup
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from flask_appbuilder.security.sqla import models as ab_models
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from flask_appbuilder.security.sqla import models as ab_models
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from markdown import markdown as md
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from markdown import markdown as md
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@ -255,3 +257,18 @@ def readfile(filepath):
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with open(filepath) as f:
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with open(filepath) as f:
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content = f.read()
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content = f.read()
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return content
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return content
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def generic_find_constraint_name(table, columns, referenced):
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"""
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Utility to find a constraint name in alembic migrations
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"""
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engine = op.get_bind().engine
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m = sa.MetaData({})
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t = sa.Table(table, m, autoload=True, autoload_with=engine)
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for fk in t.foreign_key_constraints:
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if fk.referred_table.name == referenced and \
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set(fk.column_keys) == columns:
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return fk.name
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return None
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