Merge pull request #1108 from rishabhs95/stripe

Online payment feature - direct stripe integration

app/models/ability.rb

@@ -81,6 +81,7 @@ class Ability
 
     can :index, Ticket
     can :manage, TicketPurchase, user_id: user.id
+    can [:new, :create], Payment, user_id: user.id
 
     can [:create, :destroy], Subscription, user_id: user.id
 

app/models/conference.rb

@@ -20,6 +20,7 @@ class Conference < ActiveRecord::Base
   has_one :program, dependent: :destroy
   has_one :venue, dependent: :destroy
   has_many :ticket_purchases, dependent: :destroy
+  has_many :payments, dependent: :destroy
   has_many :supporters, through: :ticket_purchases, source: :user
   has_many :tickets, dependent: :destroy
 

app/models/payment.rb

@@ -0,0 +1,41 @@
+class Payment < ActiveRecord::Base
+  has_many :ticket_purchases
+  belongs_to :user
+  belongs_to :conference
+
+  attr_accessor :stripe_customer_email
+  attr_accessor :stripe_customer_token
+
+  validates :status, presence: true
+  validates :user_id, presence: true
+  validates :conference_id, presence: true
+
+  enum status: {
+    unpaid: 0,
+    success: 1,
+    failure: 2
+  }
+
+  def amount_to_pay
+    Ticket.total_price(conference, user, paid: false).cents
+  end
+
+  def purchase
+    gateway_response = Stripe::Charge.create source: stripe_customer_token,
+                                             receipt_email: stripe_customer_email,
+                                             description: "ticket purchases(#{user.username})",
+                                             amount: amount_to_pay,
+                                             currency: conference.tickets.first.price_currency
+
+    self.amount = gateway_response[:amount]
+    self.last4 = gateway_response[:source][:last4]
+    self.authorization_code = gateway_response[:id]
+    self.status = 'success'
+    true
+
+  rescue Stripe::StripeError => error
+    errors.add(:base, error.message)
+    self.status = 'failure'
+    false
+  end
+end

app/models/ticket.rb

@@ -20,24 +20,27 @@ class Ticket < ActiveRecord::Base
   end
 
   def paid?(user)
-    ticket_purchases.find_by(user: user, paid: true).present?
+    ticket_purchases.paid.by_user(user).present?
   end
 
-  def quantity_bought_by(user)
-    result = ticket_purchases.where(user_id: user.id).first
-    result ? result.quantity : 0
+  def quantity_bought_by(user, paid: false)
+    ticket_purchases.by_user(user).where(paid: paid).sum(:quantity)
   end
 
-  def total_price(user)
-    quantity_bought_by(user) * price
+  def unpaid?(user)
+    ticket_purchases.unpaid.by_user(user).present?
   end
 
-  def self.total_price(conference, user)
+  def total_price(user, paid: false)
+    quantity_bought_by(user, paid: paid) * price
+  end
+
+  def self.total_price(conference, user, paid: false)
     tickets = Ticket.where(conference_id: conference.id)
     result = nil
     begin
       tickets.each do |ticket|
-        price = ticket.total_price(user)
+        price = ticket.total_price(user, paid: paid)
         if result
           result +=  price unless price.zero?
         else

app/models/ticket_purchase.rb

@@ -7,23 +7,24 @@ class TicketPurchase < ActiveRecord::Base
 
   validates_numericality_of :quantity, greater_than: 0
 
-  validates_uniqueness_of :user_id,
-                          scope: :ticket_id,
-                          message: 'already bought this ticket!'
-
   delegate :title, to: :ticket
   delegate :description, to: :ticket
   delegate :price, to: :ticket
   delegate :price_cents, to: :ticket
   delegate :price_currency, to: :ticket
 
+  scope :paid, -> { where(paid: true) }
+  scope :unpaid, -> { where(paid: false) }
+  scope :by_conference, -> (conference) { where(conference_id: conference.id) }
+  scope :by_user, -> (user) { where(user_id: user.id) }
+
   def self.purchase(conference, user, purchases)
     errors = []
     ActiveRecord::Base.transaction do
       conference.tickets.each do |ticket|
         quantity = purchases[ticket.id.to_s].to_i
         # if the user bought the ticket, just update the quantity
-        if ticket.bought?(user)
+        if ticket.bought?(user) && ticket.unpaid?(user)
           purchase = update_quantity(conference, quantity, ticket, user)
         else
           purchase = purchase_ticket(conference, quantity, ticket, user)
@@ -48,7 +49,8 @@ class TicketPurchase < ActiveRecord::Base
   def self.update_quantity(conference, quantity, ticket, user)
     purchase = TicketPurchase.where(ticket_id: ticket.id,
                                     conference_id: conference.id,
-                                    user_id: user.id).first
+                                    user_id: user.id,
+                                    paid: false).first
 
     purchase.quantity = quantity if quantity > 0
     purchase

app/models/user.rb

@@ -44,6 +44,7 @@ class User < ActiveRecord::Base
   has_many :registrations, dependent: :destroy
   has_many :events_registrations, through: :registrations
   has_many :ticket_purchases, dependent: :destroy
+  has_many :payments, dependent: :destroy
   has_many :tickets, through: :ticket_purchases, source: :ticket
   has_many :votes, dependent: :destroy
   has_many :voted_events, through: :votes, source: :events