Straw-Etiam
6 years ago
4 changed files with 0 additions and 166 deletions
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Generic single-database configuration. |
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# A generic, single database configuration. |
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[alembic] |
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# template used to generate migration files |
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# file_template = %%(rev)s_%%(slug)s |
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# set to 'true' to run the environment during |
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# the 'revision' command, regardless of autogenerate |
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# revision_environment = false |
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# Logging configuration |
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[loggers] |
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keys = root,sqlalchemy,alembic |
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[handlers] |
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keys = console |
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[formatters] |
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keys = generic |
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[logger_root] |
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level = WARN |
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handlers = console |
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qualname = |
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[logger_sqlalchemy] |
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level = WARN |
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handlers = |
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qualname = sqlalchemy.engine |
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[logger_alembic] |
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level = INFO |
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handlers = |
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qualname = alembic |
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[handler_console] |
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class = StreamHandler |
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args = (sys.stderr,) |
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level = NOTSET |
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formatter = generic |
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[formatter_generic] |
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format = %(levelname)-5.5s [%(name)s] %(message)s |
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datefmt = %H:%M:%S |
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from __future__ import with_statement |
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import logging |
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from logging.config import fileConfig |
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from sqlalchemy import engine_from_config |
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from sqlalchemy import pool |
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from alembic import context |
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# this is the Alembic Config object, which provides |
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# access to the values within the .ini file in use. |
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config = context.config |
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# Interpret the config file for Python logging. |
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# This line sets up loggers basically. |
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fileConfig(config.config_file_name) |
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logger = logging.getLogger('alembic.env') |
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# add your model's MetaData object here |
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# for 'autogenerate' support |
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# from myapp import mymodel |
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# target_metadata = mymodel.Base.metadata |
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from flask import current_app |
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config.set_main_option( |
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'sqlalchemy.url', current_app.config.get( |
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'SQLALCHEMY_DATABASE_URI').replace('%', '%%')) |
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target_metadata = current_app.extensions['migrate'].db.metadata |
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# other values from the config, defined by the needs of env.py, |
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# can be acquired: |
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# my_important_option = config.get_main_option("my_important_option") |
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# ... etc. |
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def run_migrations_offline(): |
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"""Run migrations in 'offline' mode. |
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This configures the context with just a URL |
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and not an Engine, though an Engine is acceptable |
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here as well. By skipping the Engine creation |
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we don't even need a DBAPI to be available. |
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Calls to context.execute() here emit the given string to the |
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script output. |
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""" |
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url = config.get_main_option("sqlalchemy.url") |
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context.configure( |
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url=url, target_metadata=target_metadata, literal_binds=True |
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) |
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with context.begin_transaction(): |
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context.run_migrations() |
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def run_migrations_online(): |
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"""Run migrations in 'online' mode. |
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In this scenario we need to create an Engine |
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and associate a connection with the context. |
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""" |
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# this callback is used to prevent an auto-migration from being generated |
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# when there are no changes to the schema |
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# reference: http://alembic.zzzcomputing.com/en/latest/cookbook.html |
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def process_revision_directives(context, revision, directives): |
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if getattr(config.cmd_opts, 'autogenerate', False): |
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script = directives[0] |
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if script.upgrade_ops.is_empty(): |
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directives[:] = [] |
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logger.info('No changes in schema detected.') |
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connectable = engine_from_config( |
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config.get_section(config.config_ini_section), |
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prefix='sqlalchemy.', |
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poolclass=pool.NullPool, |
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) |
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with connectable.connect() as connection: |
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context.configure( |
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connection=connection, |
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target_metadata=target_metadata, |
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process_revision_directives=process_revision_directives, |
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**current_app.extensions['migrate'].configure_args |
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) |
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with context.begin_transaction(): |
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context.run_migrations() |
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if context.is_offline_mode(): |
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run_migrations_offline() |
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else: |
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run_migrations_online() |
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"""${message} |
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Revision ID: ${up_revision} |
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Revises: ${down_revision | comma,n} |
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Create Date: ${create_date} |
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""" |
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from alembic import op |
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import sqlalchemy as sa |
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${imports if imports else ""} |
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# revision identifiers, used by Alembic. |
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revision = ${repr(up_revision)} |
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down_revision = ${repr(down_revision)} |
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branch_labels = ${repr(branch_labels)} |
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depends_on = ${repr(depends_on)} |
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def upgrade(): |
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${upgrades if upgrades else "pass"} |
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def downgrade(): |
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${downgrades if downgrades else "pass"} |
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