On Aug 9, 2014, at 3:22 AM, Ricardo do Valle wrote:
> How do I avoid concurrency and keep the data integrity if one user submit a
> form before the other?
>
> My issue is that the last user to submit the person/_form.rb will get all
> chosen cards, same the cards that first user chose and I want to prohibit
> that.
>
> # person.rb
>
>
> class Person < ActiveRecord::Base
>
> has_many
> :cards
>
>
> end
>
>
>
> # card.rb
>
>
> class Card < ActiveRecord::Base
>
> belongs_to
> :person
>
> scope
> :not_assigned_to_a_person, -> { Card.where(person_id: nil
> ) }
>
> end
>
>
>
> # create_cards.rb
>
> create_table
> :cards do
> |column|
> column.references
> :person, index: true
>
>
> end
>
>
>
> # person/_form.rb
>
> = f.input
> :card_ids
> ,
>
> collection: Card
> .not_assigned_to_a_person,
>
> label_method: :name, value_method: :id
> ,
>
> input_html: { multiple: true
> }
>
> StackOverflow:
> http://stackoverflow.com/questions/25216219/how-do-i-avoid-concurrency-belongs-to-and-has-many-association
>
Have a look back into the mists of time. This may still be useful.
http://railscasts.com/episodes/59-optimistic-locking
Walter
>
> --
> Ricardo do Valle
>
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