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Is there a way to run rake commands for db:migrate and db:rollback on the console?
It sucks to wait for the rails environment to load!
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Rails Migration allows you to use Ruby to define changes to your database schema, making it possible to use a version control system to keep things synchronized with the actual code. Teams of developers − If one person makes a schema change, the other developers just need to update, and run "rake migrate".
Every time a migration is generated using the rails g migration command, Rails generates the migration file with a unique timestamp. The timestamp is in the format YYYYMMDDHHMMSS . Whenever a migration is run, Rails inserts the migration timestamp into an internal table schema_migrations .
Creating Migrations To create a migration, execute db-migrate create with a title. node-db-migrate will create a node module within ./migrations/ which contains the following two exports: exports. up = function (db, callback) { callback(); }; exports.
On databases that support transactions with statements that change the schema, migrations are wrapped in a transaction. If the database does not support this then when a migration fails the parts of it that succeeded will not be rolled back. You will have to rollback the changes that were made by hand.
In the console:
ActiveRecord::Migration.remove_column :table_name, :column_name To update your schema.rb file after running migrations from the console, you must run rails db:migrate
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This will allow you to migrate without reloading the whole rails environment:
ActiveRecord::Migrator.migrate "db/migrate" and rollback:
# 3 is the number of migration to rollback, optional, defaults to 1 ActiveRecord::Migrator.rollback "db/migrate", 3 Migrate :
ActiveRecord::MigrationContext.new("db/migrate").migrate And rollback :
# 3 is the number of migration to rollback, optional, defaults to 1 ActiveRecord::MigrationContext.new("db/migrate").rollback 3 If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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