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145 lines
4.0 KiB
Python
145 lines
4.0 KiB
Python
import logging
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from logging.config import fileConfig
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from alembic import context
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from flask import current_app
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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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def get_engine():
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return current_app.extensions["migrate"].db.engine
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def get_engine_url():
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try:
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return get_engine().url.render_as_string(hide_password=False).replace("%", "%%")
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except AttributeError:
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return str(get_engine().url).replace("%", "%%")
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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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config.set_main_option("sqlalchemy.url", get_engine_url())
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target_db = current_app.extensions["migrate"].db
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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 get_metadata():
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if hasattr(target_db, "metadatas"):
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return target_db.metadatas[None]
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return target_db.metadata
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def exclude_items_from_config(section, key):
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items_ = section.get(key, None)
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if items_ is not None:
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items = items_.split(",")
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return items
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config_exclude_section = config.get_section("alembic:exclude")
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exclude_tables = exclude_items_from_config(config_exclude_section, "tables")
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exclude_indexes = exclude_items_from_config(config_exclude_section, "indexes")
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def include_name(name, type_, parent_names):
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if type_ == "schema":
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return not name
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if type_ == "table":
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metadata = get_metadata()
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if metadata:
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return name in metadata.tables
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return True
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def include_object(object, name, type_, reflected, compare_to):
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if type_ == "table" and name in exclude_tables:
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return False
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elif type_ == "index" and name in exclude_indexes:
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return False
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else:
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return True
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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,
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target_metadata=get_metadata(),
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literal_binds=True,
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include_object=include_object,
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include_name=include_name,
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include_schemas=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 = get_engine()
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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=get_metadata(),
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process_revision_directives=process_revision_directives,
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include_object=include_object,
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include_name=include_name,
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include_schemas=True,
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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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