Ruby-on-rails 如何使用 rails 控制台从表中删除一列
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How can i remove a column from table using rails console
提问by Aman Garg
It is easily possible to remove a column using rails migration.
使用 rails 迁移可以轻松删除列。
class SomeClass < ActiveRecord::Migration
def self.up
remove_column :table_name, :column_name
end
end
I want to know if there is any way to remove a column from table using console.
我想知道是否有任何方法可以使用控制台从表中删除列。
回答by Jun Zhou
You can run the codes in upmethod directly in rails console:
您可以up直接在方法中运行代码rails console：
>> ActiveRecord::Migration.remove_column :table_name, :column_name
If you already have a migration file such as "db/migrate/20130418125100_remove_foo.rb", you can do this:
如果您已经有一个迁移文件，例如“ db/migrate/20130418125100_remove_foo.rb”，您可以这样做：
>> require "db/migrate/20130418125100_remove_foo.rb"
>> RemoveFoo.up
If you just want to do rake db:migrate, try this:
如果你只是想做rake db:migrate，试试这个：
>> ActiveRecord::Migrator.migrate "db/migrate"
