Rails migration problems

Question

Is it a good practice to insert new records through migration?Recently, I got a strange error when rerunning local migrations from scratch. It throws an errors like this(Eg: Product model, Cost column):

undefined method 'cost=' for #<Product:0x10f60f4b8>

Migration:

class AddNewProducts < ActiveRecord::Migration def self.up product1 = Product.new product1.cost = 10 .... product1.save! end end

Column cost was added in a migration previously:

Class AddCosttoProducts < ActiveRecord::Migration def self.up add_column :product, :cost, :integer, :default => 0, :null => false end def self.down remove_column product, :cost end end

Any hint on why it happens?

What version of rails?

dpassage
– dpassage

2013-04-22 05:34:38 +00:00
Commented Apr 22, 2013 at 5:34 — dpassage
– dpassage, Commented Apr 22, 2013 at 5:34

HungryCoder · Accepted Answer · 2013-04-22 05:36:36Z

If you already ran the previous migration (to add cost field), try resetting column information before you add records.

class AddNewProducts < ActiveRecord::Migration def self.up Product.reset_column_information product1 = Product.new product1.cost = 10 .... product1.save! end end

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