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### Custom | ||
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migrations/** | ||
!migrations/versions | ||
# migrations/** | ||
# !migrations/versions | ||
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*.db | ||
*.rdb | ||
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Single-database configuration for Flask. |
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# A generic, single database configuration. | ||
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[alembic] | ||
# template used to generate migration files | ||
# file_template = %%(rev)s_%%(slug)s | ||
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# set to 'true' to run the environment during | ||
# the 'revision' command, regardless of autogenerate | ||
# revision_environment = false | ||
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# Logging configuration | ||
[loggers] | ||
keys = root,sqlalchemy,alembic,flask_migrate | ||
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[handlers] | ||
keys = console | ||
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[formatters] | ||
keys = generic | ||
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[logger_root] | ||
level = WARN | ||
handlers = console | ||
qualname = | ||
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[logger_sqlalchemy] | ||
level = WARN | ||
handlers = | ||
qualname = sqlalchemy.engine | ||
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[logger_alembic] | ||
level = INFO | ||
handlers = | ||
qualname = alembic | ||
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[logger_flask_migrate] | ||
level = INFO | ||
handlers = | ||
qualname = flask_migrate | ||
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[handler_console] | ||
class = StreamHandler | ||
args = (sys.stderr,) | ||
level = NOTSET | ||
formatter = generic | ||
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[formatter_generic] | ||
format = %(levelname)-5.5s [%(name)s] %(message)s | ||
datefmt = %H:%M:%S |
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import logging | ||
from logging.config import fileConfig | ||
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from flask import current_app | ||
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from alembic import context | ||
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# this is the Alembic Config object, which provides | ||
# access to the values within the .ini file in use. | ||
config = context.config | ||
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# Interpret the config file for Python logging. | ||
# This line sets up loggers basically. | ||
fileConfig(config.config_file_name) | ||
logger = logging.getLogger('alembic.env') | ||
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def get_engine(): | ||
try: | ||
# this works with Flask-SQLAlchemy<3 and Alchemical | ||
return current_app.extensions['migrate'].db.get_engine() | ||
except (TypeError, AttributeError): | ||
# this works with Flask-SQLAlchemy>=3 | ||
return current_app.extensions['migrate'].db.engine | ||
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def get_engine_url(): | ||
try: | ||
return get_engine().url.render_as_string(hide_password=False).replace( | ||
'%', '%%') | ||
except AttributeError: | ||
return str(get_engine().url).replace('%', '%%') | ||
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# add your model's MetaData object here | ||
# for 'autogenerate' support | ||
# from myapp import mymodel | ||
# target_metadata = mymodel.Base.metadata | ||
config.set_main_option('sqlalchemy.url', get_engine_url()) | ||
target_db = current_app.extensions['migrate'].db | ||
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# other values from the config, defined by the needs of env.py, | ||
# can be acquired: | ||
# my_important_option = config.get_main_option("my_important_option") | ||
# ... etc. | ||
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def get_metadata(): | ||
if hasattr(target_db, 'metadatas'): | ||
return target_db.metadatas[None] | ||
return target_db.metadata | ||
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def run_migrations_offline(): | ||
"""Run migrations in 'offline' mode. | ||
This configures the context with just a URL | ||
and not an Engine, though an Engine is acceptable | ||
here as well. By skipping the Engine creation | ||
we don't even need a DBAPI to be available. | ||
Calls to context.execute() here emit the given string to the | ||
script output. | ||
""" | ||
url = config.get_main_option("sqlalchemy.url") | ||
context.configure( | ||
url=url, target_metadata=get_metadata(), literal_binds=True | ||
) | ||
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with context.begin_transaction(): | ||
context.run_migrations() | ||
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def run_migrations_online(): | ||
"""Run migrations in 'online' mode. | ||
In this scenario we need to create an Engine | ||
and associate a connection with the context. | ||
""" | ||
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# this callback is used to prevent an auto-migration from being generated | ||
# when there are no changes to the schema | ||
# reference: http://alembic.zzzcomputing.com/en/latest/cookbook.html | ||
def process_revision_directives(context, revision, directives): | ||
if getattr(config.cmd_opts, 'autogenerate', False): | ||
script = directives[0] | ||
if script.upgrade_ops.is_empty(): | ||
directives[:] = [] | ||
logger.info('No changes in schema detected.') | ||
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conf_args = current_app.extensions['migrate'].configure_args | ||
if conf_args.get("process_revision_directives") is None: | ||
conf_args["process_revision_directives"] = process_revision_directives | ||
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connectable = get_engine() | ||
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with connectable.connect() as connection: | ||
context.configure( | ||
connection=connection, | ||
target_metadata=get_metadata(), | ||
**conf_args | ||
) | ||
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with context.begin_transaction(): | ||
context.run_migrations() | ||
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if context.is_offline_mode(): | ||
run_migrations_offline() | ||
else: | ||
run_migrations_online() |
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"""${message} | ||
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Revision ID: ${up_revision} | ||
Revises: ${down_revision | comma,n} | ||
Create Date: ${create_date} | ||
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""" | ||
from alembic import op | ||
import sqlalchemy as sa | ||
${imports if imports else ""} | ||
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# revision identifiers, used by Alembic. | ||
revision = ${repr(up_revision)} | ||
down_revision = ${repr(down_revision)} | ||
branch_labels = ${repr(branch_labels)} | ||
depends_on = ${repr(depends_on)} | ||
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def upgrade(): | ||
${upgrades if upgrades else "pass"} | ||
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def downgrade(): | ||
${downgrades if downgrades else "pass"} |