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Update jobs archived flag before setting the default value

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Running an update before setting the column default value reduces
the time the table is locked (since most rows don't have a NULL
value anymore), but the migration takes slightly longer to run
overall.
This commit is contained in:
Alexey Bezhan
2018-11-28 14:01:59 +00:00
parent f941b8b146
commit 452924faaf
1 changed files with 3 additions and 1 deletions
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4
migrations/versions/0245_archived_flag_jobs.py
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@@ -15,7 +15,9 @@ down_revision = '0244_another_letter_org'
def upgrade(): def upgrade():
# ### commands auto generated by Alembic - please adjust! ### # ### commands auto generated by Alembic - please adjust! ###
op.add_column('jobs', sa.Column('archived', sa.Boolean(), nullable=False, server_default=sa.false())) op.add_column('jobs', sa.Column('archived', sa.Boolean(), nullable=True))
op.execute('update jobs set archived = false')
op.alter_column('jobs', 'archived', nullable=False, server_default=sa.false())
# ### end Alembic commands ### # ### end Alembic commands ###