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View tables

ActiveRecord::Base.connection.tables

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Delete any table.

ActiveRecord::Base.connection.drop_table("users")
    ------------OR----------------------
    ActiveRecord::Migration.drop_table(:users)
    ------------OR---------------------
    ActiveRecord::Base.connection.execute("drop table users")

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Remove index from existing column

 ActiveRecord::Migration.remove_index(:users, :name => 'index_users_on_country')

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where country is a column name in the migration file with already added index in users table as shown below:-

t.string :country,add_index: true

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Remove foreign key constraint

ActiveRecord::Base.connection.remove_foreign_key('food_items', 'menus')

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where menus has_many food_items and their respective migrations too.

Add column

ActiveRecord::Migration.remove_column :table_name, :column_name

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Example

 ActiveRecord::Migration.add_column :profiles, :profile_likes, :integer, :default => 0

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Ruby on Rails - playing with tables using rails console in ruby on rails- ruby on rails tutorial - rails guides - rails tutorial - ruby rails

Playing with tables using rails console

View tables

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Delete any table.

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Remove index from existing column

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Clicking "Copy Code" button will copy the code into the clipboard - memory. Please paste(Ctrl+V) it in your destination. The code will get pasted. Happy coding from Wikitechy - ruby on rails tutorial - rails guides - ruby rails - rubyonrails - learn ruby on rails - team

Remove foreign key constraint

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Add column

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Example

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