Allow the issuer of a request to cancel it (closes #50)

app/controllers/requests_controller.rb

@@ -1,11 +1,11 @@
 class RequestsController < ApplicationController
   load_and_authorize_resource :user, find_by: :name
 
-  before_action :load_request, only: [:confirm, :decline]
-  authorize_resource :request, id_param: :request_id, only: [:confirm, :decline]
+  before_action :load_request, only: [:confirm, :decline, :cancel]
+  authorize_resource :request, id_param: :request_id, only: [:confirm, :decline, :cancel]
 
   def index
-    @requests = @user.incoming_requests.group_by(&:status)
+    @requests = @user.requests.group_by(&:status)
     respond_to do |format|
       format.html { }
       format.json { render json: @requests }
@@ -22,6 +22,11 @@ def decline
     redirect_to root_path
   end
 
+  def cancel
+    @request.cancel!
+    redirect_to root_path
+  end
+
   private
 
   def load_request

app/models/request.rb

@@ -17,7 +17,7 @@
 class Request < ActiveRecord::Base
   include BaseTransaction
 
-  enum status: [:open, :confirmed, :declined]
+  enum status: [:open, :confirmed, :declined, :cancelled]
 
   def confirm!
     return unless open?
@@ -36,6 +36,15 @@ def decline!
     update_attributes status: :declined
   end
 
+  def cancel!
+    return unless open?
+
+    Notification.create user: creditor, message: cancelled_message unless issuer == creditor
+    Notification.create user: debtor, message: cancelled_message unless issuer == debtor
+
+    update_attributes status: :cancelled
+  end
+
   private
 
   def confirmed_message
@@ -45,4 +54,8 @@ def confirmed_message
   def declined_message
     "#{debtor.name} refuses to pay €#{amount/100.0} for \"#{message}\"."
   end
+
+  def cancelled_message
+    "#{issuer.name} cancelled the request to pay #{debtor.name} €#{amount/100.0} for \"#{message}\" to #{creditor.name}."
+  end
 end

app/models/user.rb

@@ -35,6 +35,10 @@ def transactions
     Transaction.where('creditor_id = ?', id).or(Transaction.where('debtor_id = ?', id))
   end
 
+  def requests
+    Request.where('debtor_id = ?', id).or(Request.where('creditor_id = ?', id).or(Request.where('issuer_id = ?', id)))
+  end
+
   def calculate_balance!
     balance = incoming_transactions.sum(:amount) -
                 outgoing_transactions.sum(:amount)

app/models/user_ability.rb

@@ -7,6 +7,7 @@ def initialize(user)
     can :manage, :all if user.penning?
     can :create, Request, creditor_id: user.id
     can [:confirm, :decline], Request, debtor_id: user.id
+    can :cancel, Request, issuer_id: user.id
     can [:read, :reset_key, :add_registration_token], User, id: user.id
     can :manage, Notification, user_id: user.id
     can :create, Transaction do |t|

app/views/requests/_index.html.haml

@@ -2,24 +2,34 @@
 %table.pure-table
   %thead
     %tr
-      %th Peer
       %th Issuer
+      %th Creditor
+      %th Debtor
       %th Amount
       %th Message
       - if actions
-        %th Accept
-        %th Decline
+        %th Actions
   %tbody
     - (requests || []).each do |r|
       %tr
-        %td= r.creditor.name
         %td= r.issuer.name
+        %td= r.creditor.name
+        %td= r.debtor.name
         %td= r.amount_f
         %td= r.message
         - if actions
           %td
-            = link_to request_confirm_path(r), method: :post do
-              %span.glyphicon.glyphicon-ok
-          %td
-            = link_to request_decline_path(r), method: :post do
-              %span.glyphicon.glyphicon-remove
+            - if can?(:confirm, r)
+              = link_to request_confirm_path(r), method: :post, class: "btn btn-success btn-xs" do
+                %i.glyphicon.glyphicon-ok
+                Accept
+               
+            - if can?(:decline, r)
+              = link_to request_decline_path(r), method: :post, class: "btn btn-danger btn-xs" do
+                %i.glyphicon.glyphicon-remove
+                Decline
+               
+            - if can?(:cancel, r)
+              = link_to request_cancel_path(r), method: :post, class: "btn btn-warning btn-xs" do
+                %i.glyphicon.glyphicon-trash
+                Cancel

app/views/requests/index.html.haml

@@ -1,3 +1,4 @@
 = render 'index', actions: true, title: 'Open Requests', requests: @requests['open']
-= render 'index', actions: false, title: 'Confirmed Requests', requests: @requests['confirmed'] 
+= render 'index', actions: false, title: 'Confirmed Requests', requests: @requests['confirmed']
 = render 'index', actions: false, title: 'Declined Requests', requests: @requests['declined']
+= render 'index', actions: false, title: 'Cancelled Requests', requests: @requests['cancelled']

config/routes.rb

@@ -18,6 +18,7 @@
     resources :requests, only: [:index], shallow: true do
       post :confirm
       post :decline
+      post :cancel
     end
     resources :notifications, only: [:index], shallow: true do
       post :read