ruby on rails - How do I create a new attribute in a model? -

hi i'm new in ruby , rails , want create new attribute email model account. down below test new attribute. test copy of name attribute test figured working in similar way.

it "should have email field"   @account.email = "email"   @account = save_and_reload(@account)   @account.email.should == "email" end 

the thing i've done make test pass create email attribute in account model. , have manually inserted new column email in database account table.

here part of account model code i've inserted email attribute:

class account < activerecord::base   attr_accessible :name, :logo, :account_preference_attributes,:email 

when run test error nomethoderror in 'account should have email field'

undefined method `email=' #<account:0xb6468ca8> 

so how create new attribute in model?

you have create migration add email column table , run rake db:migrate

class addssl < activerecord::migration  def self.up    add_column :accounts, :email, :string  end   def self.down    remove_column :accounts,:email  end  end 

also remove email column table have manually added.