VivianDee
89 lines
2.6 KiB
Python
89 lines
2.6 KiB
Python
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 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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if config.config_file_name is not None:
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fileConfig(config.config_file_name)
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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 Base
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# target_metadata = Base.metadata
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from flask import current_app
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from app.extensions import db
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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 = db.metadata
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# Function to filter objects for autogenerate
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def include_object(object, name, type_, reflected, compare_to):
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"""
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Control which objects are included in the autogenerate process.
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Only include objects that are part of the Flask app's declared models.
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"""
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if type_ == "table" and reflected and name not in target_metadata.tables:
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return False # Exclude tables that are in DB but not in models
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return True # Include everything else (e.g., our modeled tables, columns, 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 database to begin with.
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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=target_metadata,
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literal_binds=True,
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dialect_opts={"paramstyle": "named"},
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include_object=include_object
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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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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, target_metadata=target_metadata,
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include_object=include_object
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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() |