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PORails 3: Instance variable not working as charge amount for Stripe?
 

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  1. PORails 3: Instance variable not working as charge amount for Stripe?
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    <p>I'm adding Stripe to my Rails 3 app to accept credit card payments, and I'm trying to use an instance variable, "@total", for the amount to be charged to the customers. </p> <p>Here's what I currently have in my model:</p> <pre><code>class Video &lt; ActiveRecord::Base attr_accessible :age, :category, :description, :ethnicity, :gender, :genre, :interest, :length, :panda_video_id, :size, :tagline, :title, :video_id, :stripe_card_token attr_writer :current_step attr_accessor :stripe_card_token serialize :size serialize :age serialize :gender serialize :ethnicity has_many :audiences, :dependent =&gt; :destroy accepts_nested_attributes_for :audiences, :allow_destroy =&gt; true #validates_presence_of :panda_video_id, :if =&gt; lambda { |o| o.current_step == "upload" } def panda_video @original_video ||= Panda::Video.find(panda_video_id) end def save_with_payment if valid? charge = Stripe::Charge.create( amount: @total, currency: "usd", card: stripe_card_token ) end rescue Stripe::InvalidRequestError =&gt; e logger.error "Stripe error while creating charge: #{e.message}" errors.add :base, "There was a problem with your credit card." false end def current_step @current_step || steps.first end def steps %w[upload info audience review] end def next_step self.current_step = steps[steps.index(current_step)+1] end def previous_step self.current_step = steps[steps.index(current_step)-1] end def first_step? current_step == steps.first end def last_step? current_step == steps.last end def all_valid? steps.all? do |step| self.current_step = step valid? end end end </code></pre> <p>I contacted Stripe support, and they said that the instance variable should be working here. So, I suspect the problem lies with my controller:</p> <pre><code>class VideosController &lt; ApplicationController def index @videos = Video.all end def show @video = Video.find(params[:id]) @original_video = @video.panda_video @h264_encoding = @original_video.encodings["h264"] end def new session[:video_params] ||= {} @video = Video.new(session[:video_params]) @video.current_step = session[:video_step] end def create session[:video_params].deep_merge!(params[:video]) if params[:video] #Save total value and audience form to session. @total = session[:video_params]["size"].collect(&amp;:to_i).sum - 10 if session[:video_params]["size"] @audiences = session[:video_params].slice("size", "gender", "age", "ethnicity").to_json @video = Video.new(session[:video_params]) @video.current_step = session[:video_step] if @video.valid? if params[:back_button] @video.previous_step elsif @video.last_step? @video.save if @video.all_valid? &amp;&amp; @video.save_with_payment else @video.next_step end session[:video_step] = @video.current_step end if @video.new_record? render "new" else session[:video_step] = session[:video_params] = nil flash[:notice] = "Video saved" redirect_to @video end end def edit @video = Video.find(params[:id]) end def update @video = Video.find(params[:id]) if @video.update_attributes(params[:video]) redirect_to @video, :notice =&gt; "Successfully updated video." else render :action =&gt; 'edit' end end def destroy @video = Video.find(params[:id]) @video.destroy redirect_to videos_url, :notice =&gt; "Successfully destroyed video." end end </code></pre> <p>My rails app is a multi-step form, where all the data is stored in a session. @total sums up the input values in the audience step of the form, and then that @total number shows up in the final step, where the customer enters their payment info. The @total number currently shows up on this page, but for some reason Stripe can't process it, since I keep getting the following error: </p> <pre><code>Stripe error while creating charge: Missing required param: amount </code></pre> <p>What am I doing wrong here?</p>
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