Rails 3/4：如何通过link_to增加和保存数据库值

Question

I have a database with users, vendors, and accounts.

user has an account, account has an integer value credits

vendor has an integer value, product count

I want to be able to have a button on my app that when a button is clicked it will update these two items in the database:

 current_user.account.credits
 vendor.product_count 

I am still vert new to rails and don't really know how it all works yet, so would love some help :D

My git repo on bit bucket so you can examine the code: https://umlungu@bitbucket.org/umlungu/mybeans.git

Answer 1

On the button_to, you supply parameters that get passed into the controller, and the controller operates based on the received parameters. So far you've not given any information about what controller, what view, or whatever, so the answer is likewise general in nature.

In the view:

<%= button_to 'Something', {controller: "some_controller", action: "some_action", credits: credits, vendor_id: vendor.id} %>

In the controller "some_controller"

  def some_action
    credits = params[:credits]
    credits ||= 0
    vendor_id = params[:vendor_id]

    # find the current user, and update its credits
    # find the vendor and update the product count?
    # send your user somewhere
  end
end