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b8282b1d46
Supporting multiple backends requires that specific sqlite collations are not used, thus lowercase is applied to all non case-sensitive columns. However, lowercasing the database requires temporary disabling foreign key constraints, which is not possible on SQLite and requires we specify the constraint names. This migration specific to sqlite and postgresql drops every constraint, whether it is named or not, and recreates all of them with known names so we can later disable them.
92 lines
3.0 KiB
Python
Executable File
92 lines
3.0 KiB
Python
Executable File
from __future__ import with_statement
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from alembic import context
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from sqlalchemy import engine_from_config, pool
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from logging.config import fileConfig
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import logging
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import tenacity
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from tenacity import retry
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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('sqlalchemy.url',
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current_app.config.get('SQLALCHEMY_DATABASE_URI'))
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#target_metadata = current_app.extensions['migrate'].db.metadata
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from mailu import models
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target_metadata = models.Base.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(url=url)
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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.readthedocs.org/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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engine = engine_from_config(config.get_section(config.config_ini_section),
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prefix='sqlalchemy.',
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poolclass=pool.NullPool)
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connection = retry(engine.connect, stop=tenacity.stop_after_attempt(100), wait=tenacity.wait_random(min=2, max=5))()
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context.configure(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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try:
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with context.begin_transaction():
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context.run_migrations()
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finally:
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connection.close()
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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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