AR validation question

rubyonrails-talk
1

What is the best way to implement a validation for a withdrawal operation? So there is an Operation and Client models. Client has_many :operations. In case of withdrawal operation, I’d like to check if the requested sum is not greater than a Client account balance. How to link the validation in the Operation model to a specific client ?

class Client < AR has_many :operations end

class Operation < AR belongs_to :client attr_accessible :sum end

The routes are defined so that an operation could only created in the context of a Client.

Thanks

2

What is the best way to implement a validation for a withdrawal operation? So there is an Operation and Client models. Client has_many :operations. In case of withdrawal operation, I'd like to check if the requested sum is not greater than a Client account balance. How to link the validation in the Operation model to a specific client ?

In the custom validation of the operation you can use self.client to give you its client.

Colin