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Stewart

2007-Feb-10 06:42 UTC

getting the business logic right!

Hello,

I am working on a voting system. I wish to have a system that allows
users to vote every X amount of time. I am using a vote model that
creates a new record every time a vote is cast. How would i add a check
to stop users form voting more than once in the X amount of time.

here is the vote model

class CreateVotes < ActiveRecord::Migration
  def self.up
    create_table :votes do |t|
      t.column :time, :datetime
      t.column :user_id, :int
      t.column :celebrity_id, :int
    end
  end

  def self.down
    drop_table :votes
  end
end


thanks for your time reading this post!!!

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Alex Wayne

2007-Feb-10 07:06 UTC

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Re: getting the business logic right!

Stewart wrote:> How would i add a check
> to stop users form voting more than once in the X amount of time.
> 
> here is the vote model
> 
> class CreateVotes < ActiveRecord::Migration
>   def self.up
>     create_table :votes do |t|
>       t.column :time, :datetime
>       t.column :user_id, :int
>       t.column :celebrity_id, :int
>     end
>   end
> 
>   def self.down
>     drop_table :votes
>   end
> end
You can do this with validations.  Write a custom validation that checks 
the database to see if any other votes conflict with it.

  class Vote < ActiveRecord::Base
    def validate
      if Vote.find(:first,
           :conditions => [''time < ? AND user_id = ?'',
1.day.ago,
user_id]
        errors.add_to_base ''You cannot vote more than once per
day!''
      end
    end
  end

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Stewart

2007-Feb-11 09:01 UTC

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Re: getting the business logic right!

Hi Alex,

Thanks mate thats exactly what i was looking for.

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Stewart

2007-Feb-11 09:19 UTC

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Re: getting the business logic right!

ok one more question.

My site uses sessions to track all of the user information. This session 
is saved in a value called current_user.  When a vote is cast i want to 
record the user that cast the vote so i can check and make sure that 
user is not voting more than once in a day. I also wish to support guest 
voting. This would record the ip address of the voting user. Should i 
set this logic up in the model?

thanks again for your time

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Stewart

2007-Feb-12 07:04 UTC

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Re: getting the business logic right!

Stewart wrote:> ok one more question.
> 
> My site uses sessions to track all of the user information. This session 
> is saved in a value called current_user.  When a vote is cast i want to 
> record the user that cast the vote so i can check and make sure that 
> user is not voting more than once in a day. I also wish to support guest 
> voting. This would record the ip address of the voting user. Should i 
> set this logic up in the model?
> 
> thanks again for your time
sorry to bump this but this is a very busy forum

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Alan Francis

2007-Feb-12 14:16 UTC

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Re: getting the business logic right!

Stewart wrote:> 
> 
> Hi Alex,
> 
> Thanks mate thats exactly what i was looking for.
Also, if you call the column created_at, Rails will automatically fill 
in the time for you.

Alan

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Alex Wayne

2007-Feb-12 17:45 UTC

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Re: getting the business logic right!

Stewart wrote:> ok one more question.
> 
> My site uses sessions to track all of the user information. This session 
> is saved in a value called current_user.  When a vote is cast i want to 
> record the user that cast the vote so i can check and make sure that 
> user is not voting more than once in a day. I also wish to support guest 
> voting. This would record the ip address of the voting user. Should i 
> set this logic up in the model?
> 
> thanks again for your time
Business logic always goes in the model.

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Rails - Feb 2007 - getting the business logic right!

getting the business logic right!

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