I have the problem, that I have an migration in Rails that sets up a default setting for a column, like this example: def self.up add_column :column_name, :bought_at, :datetime, :default => Time.now end Suppose, I like to drop that default settings in a later migration, how do I do that with using rails migrations? My … Read more
I need to add timestamps (created_at & updated_at) to an existing table. I tried the following code but it didn’t work. class AddTimestampsToUser < ActiveRecord::Migration def change_table add_timestamps(:users) end end 21 Answers 21
I have a rake task that won’t work unless a table exists. I’m working with more than 20 engineers on a website so I want to make sure they have migrated the table before they can do a rake task which will populate that respective table. Does AR have a method such as Table.exists? How … Read more
A user has many uploads. I want to add a column to the uploads table that references the user. What should the migration look like? Here is what I have. I’m not sure if I should use (1) :user_id, :int or (2) :user, :references. I’m not even sure if (2) works. Just trying to do … Read more
What’s the syntax for dropping a database table column through a Rails migration? 23 s 23 remove_column :table_name, :column_name For instance: remove_column :users, :hobby would remove the hobby Column from the users table.
