如果一个对象失败所有对象回滚

Question

begin 
    ActiveRecord::Base.transaction do 
    installations.each do |installation| 
     id = installation.id 
     installation = current_user.installations.find_by(:id=> id) 
     @ticket = installation.tickets.new(ticket_params) 
     unless @ticket.save 
     raise ActiveRecord::Rollback 
     end 
    end 
    end 
    redirect_to '/tickets', notice: "done" 
rescue ActiveRecord::Rollback 
    render action: "new", notice: "problem" and return 
end 

想象一下，我们有两张票，第一张票有效，第二张票无效。在此代码中，第一张票将被保存。但是当我失败时我想要回滚所有的票据。 我该怎么做？

Answer 1

你可以建立@ticket.save的返回值的集合，呼吁.all?在他们身上，如果你得到一个错误的加薪回滚：

ActiveRecord::Base.transaction do 
    installations.each do |installation| 
    tickets_saved = [] 
    id = installation.id 
    installation = current_user.installations.find_by(:id=> id) 
    ticket = installation.tickets.new(ticket_params) 
    tickets_saved << ticket.save 
    end 

    unless tickets_saved.all? 
    raise ActiveRecord::Rollback 
    end 
end