Unending/non-terminating database query - Rails - ruby-on-rails

Question

I want to implement a way of clicking a button and running a method without having to switch to the view of the specifid item/object found by id. I'm using PostgrSQL.
In my PaymentsController I have a method called withdraw, which looks something like this:
def withdraw
#payment = Payment.find(params[:id])
#payment.withdrawn = true
#payment.amount_interest = withdraw.amount * 1.1
#payment.save
head :ok
end
And the route:
patch '/withdraw/:id', to: 'payments#withdraw', as: :withdraw
each statement with link_to:
<% #payments.each do |withdraw| %>
<tr>
<td><%= withdraw.amount %></td>
<td><%= link_to 'Withdraw', withdraw_path(withdraw), method: :patch, remote: true %></td>
</tr>
<% end %>
EDIT: Upon clicking "Withdraw" I get an unending database query that looks like this:
Started PATCH "/withdraw/1" for 127.0.0.1 at 2016-11-11 21:20:34 +0200
Processing by PaymentsController#withdraw as JS
Parameters: {"id"=>"1"}
Started PATCH "/withdraw/1" for 127.0.0.1 at 2016-11-11 21:20:34 +0200
Processing by PaymentsController#withdraw as JS
Member Load (40.0ms) SELECT "members".* FROM "members" WHERE "members"."id" = $1 ORDER BY "members"."id" ASC LIMIT $2 [["id", 1], ["LIMIT", 1]]
Parameters: {"id"=>"1"}
Member Load (1.4ms) SELECT "members".* FROM "members" WHERE "members"."id" = $1 ORDER BY "members"."id" ASC LIMIT $2 [["id", 1], ["LIMIT", 1]]
Payment Load (0.0ms) SELECT "payments".* FROM "payments" WHERE "payments"."id" = $1 LIMIT $2 [["id", 1], ["LIMIT", 1]]
Payment Load (2.0ms) SELECT "payments".* FROM "payments" WHERE "payments"."id" = $1 LIMIT $2 [["id", 1], ["LIMIT", 1]]
Payment Load (1.1ms) SELECT "payments".* FROM "payments" WHERE "payments"."id" = $1 LIMIT $2 [["id", 1], ["LIMIT", 1]]
Payment Load (0.0ms) SELECT "payments".* FROM "payments" WHERE "payments"."id" = $1 LIMIT $2 [["id", 1], ["LIMIT", 1]]
My Payments model has the following:
account:string amount:decimal paid:boolean withdrawn:boolean amount_interest:decimal
belongs_to :member
Any assistance will be greatly appreciated.

Answer 1

The issue was a bug in my withdraw method.
changed:
#payment.amount_interest = withdraw.amount * 1.1
to:
#payment.amount_interest = #payment.amount * 1.1