ruby - Check validation before save rails -

using stripe , want to: 1. check model validation 2. if no errors process card token. 3. if card works save new record.

below have processes card first, if successful, saves record. unfortunately record might fail validation card charged.

as hack have js validation (that mirrors model validations) in view doesn't allow form submitted until terms met.

tourregistration.rb controller

    def create token = params[:tourregistration][:stripetoken] begin   charge = stripe::charge.create(   :amount => (params[:tourregistration][:invoice].to_d*100).round,   :currency => "usd",   :source => token,   :description => "example charge"   ) rescue stripe::carderror => e   # card has been declined   redirect_to :back, :notice => "#{e}" else  @tourregistrations = tourregistration_data.map |tourregistration_params|   tourregistration.new(tourregistration_params) end  @tourregistrations.each(&:save)    if @tourregistrations.all?(&:valid?)     flash[:notice] = 'sign-up complete'     redirect_to root_url   else     redirect_to :back, :notice => "something went wrong. please fill in fields."     end     end 

end

tourregistration.rb model

class tourregistration < activerecord::base belongs_to :patron belongs_to :tour has_one :referrer  validates :fname, length: { minimum: 2} validates :lname, length: { minimum: 2} validates :email, presence: true validates :price, presence: true validates :invoice, presence: true validates :patron_id, presence: true validates :tour_id, presence: true end 

other callbacks, can use database transaction, example :

activerecord::base.transaction   results = @tourregistrations.map(&:save) # validate , save records   raise activerecord::rollback if results.any?{|result| result == false } # rollback transaction if registration failed saved   payment = charge_card # process payment   raise activerecord::rollback unless payment # rollback if payment failed end 

as side note, kind of logic textbook example service object.