Ruby on Rails使用设置生成ActiveRecord模型

Question

I need to create model by generating in terminal with command
rails generate model ...

How can i set validation of uniqueness on one of column, and name of primary_key field using that command? I found how could it be done by:
rails g model model_name field_name1:type:uniq field_name2:type:primary_key...

It sets for the table in database primary_key and uniqueness on certain fields with the migration. However i want to define settings for the ActiveRecord model which will be stored in "ModelName.rb" file in the "models" folder of my project.

For now i call the ModelName.validates_uniqueness_of(:field_name) method every time when I operate with records of model to prevent adding record with duplicate values on :field_name1

Answer 1

You can use the validate helper uniqueness: true which validates the uniqueness of the attribute's value right before the object gets saved.

class ModelName < ActiveRecord::Base
  validates :field_name1 uniqueness: true
end

And, as @Abhi pointed out for you, take a look at the Active Record Validations Documentation.