Schema file ruby on rails

The schema file located in db/schema.rb was most likely generated the very last time you ran rake db:migrate. This is because rake db:migrate migrates your db through all of the migrations in your db/migrate folder, and then it calls the db:schema:dump task, which generates the schema file based on the current state of the database.\n\nFor your situation, after you have run ActiveRecord::Migration.drop_table(:foo) in the rails console, the current state of your database (now, no longer having the table foo) is not in sync with the schema.rb file that was generated when you last migrated.\n\nWhat you want to do at this point is re-dump the schema based on the current state of the database, and you do this by running rake db:schema:dump. This will take the current state of your database (without the table foo) and generate your db/schema.rb file.\n\nFor more information on the schema file and its relationship to migrations, I would recommend looking at the Rails Guide on Active Record Migrations: Schema Dumping and You.",