0

I use the command like this:

administrator@ubuntu:~/demo$ rails generate migration Testabc test123:string

and the terminal respond:

invoke active_record
create db/migrate/20120204124219_testabc.rb

But in the file`s content is:

class Testabc < ActiveRecord::Migration
  def up
  end

  def down
  end
end

So, where is my table and the string column?

tshepang
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Rinko Kobayakawa
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2 Answers2

3

Your migration needs to look like rails g migration add_<field>_to_<table> field:type. For example, this:

rails generate migration add_fieldname_to_tablename fieldname:string

will produce this:

class AddFieldnameToTablename < ActiveRecord::Migration
  def up
    add_column :tablenames, :fieldname, :string
  end

  def down
    remove_column :tablenames, :fieldname
  end
end

If you wanted to generate a model from scratch, then you should do:

rails generate model Widget fieldname:string

which will produce a migration that includes the fields needed for the model.

John Feminella
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  • At first,I just want to create a middle table to connect two tables,build a many-to-many relationship. This is just a simple example,I do not intending to modify a table :) – Rinko Kobayakawa Feb 04 '12 at 13:52
0

Maybe you're looking for:

rails generate model Testabc test123:string
gtd
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