Rails: Form help -- supplying method with argument -
i relatively new rails , have attempted write small loan app user can make loan , app can track balances / etc. adding function loan model handles payments , have gotten far (draw attention make_payment(value) portion:
loan.rb
class loan < activerecord::base belongs_to :lender, :class_name => 'user' belongs_to :borrower, :class_name => 'user' has_many :payments default_scope -> { order(created_at: :desc) } validates :amount, presence: true validates :lender, presence: true validates :borrower, presence: true def make_payment(value) remainder = amount - value update_attribute(:amount, remainder) return remainder end end i can use correctly deduct value original loan amount, cannot seem make work using views , form. view follows:
app/views/loans/show.html.erb
<p id="notice"><%= notice %></p> <div class="row"> <div class="col-md-2"> <ul> <li><strong>lender</strong>: <%= @loan.lender.username %></li> <li><strong>borrower</strong>: <%= @loan.borrower.username %></li> <li><strong>amount remaining</strong>: <%= @loan.amount %></li> </ul> <section> <div class="col-md-6 col-md-offset-3"> <%= form_for @loan |f| %> <%= f.label :make_payment %> <!--confusion --> <%= f.number_field :value, class: 'form-control' %> <!--confusion --> <%= f.submit "submit payment", class: "btn btn-primary" %> <% end %> </div> </section> </div> </div> <%= link_to 'edit', edit_loan_path(@loan) %> | <%= link_to 'back', loans_path %> when try reach page, error wrong number of arguments (0 1) makes complete sense, i'd value submitted in form argument (value) function make_payment(value). should use form_for @loan.make_payment |f| or else entirely? i'm sure simple fix, can't seem find answer i'm looking for.
a nice restful solution this:
resources :loans, shallow: :true resources :payments, only: :create end class paymentscontroller < applicationcontroller # post /loans/:loan_id/payments def create @loan = loan.find(params[:loan_id]) @loan.make_payment(payment) if @load.save redirect_to @loan, notice: "payment successful" else redirect_to @loan, alert: "payment count not processed" end end private def payment require(:loan).require(:payment)[:payment] end end and form this:
<%= form_for @loan, url: loan_payments_path(loan: @loan), method: :post |f| %> <%= f.label :payment %> <%= f.number_field :payment, class: 'form-control' %> <%= f.submit "submit payment", class: "btn btn-primary" %> <% end %>
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