REFACTOR: Use the Prices API in place of Plans (#17)

Stripe has a newer API called Prices where you can create a price for any product and it can either be recurring or one-time. The easy part is existing Plans work with the Prices API by passing a Plan ID, but objects are returned in the slightly-different Prices API object format.

This commit is a refactor to the new API to handle the data in its new form, and lays the foundation for a one time payment plan to be added to any subscriptions product.

assets/javascripts/discourse/models/admin-plan.js.es6

@@ -6,28 +6,24 @@ const AdminPlan = Plan.extend({
   isNew: false,
   name: "",
   interval: "month",
-  amount: 0,
+  unit_amount: 0,
   intervals: ["day", "week", "month", "year"],
   metadata: {},
 
   @discourseComputed("trial_period_days")
-  parseTrialPeriodDays(trial_period_days) {
-    if (trial_period_days) {
-      return parseInt(0 + trial_period_days, 10);
+  parseTrialPeriodDays(trialDays) {
+    if (trialDays) {
+      return parseInt(0 + trialDays, 10);
     } else {
       return 0;
     }
   },
 
-  destroy() {
-    return ajax(`/s/admin/plans/${this.id}`, { method: "delete" });
-  },
-
   save() {
     const data = {
       nickname: this.nickname,
       interval: this.interval,
-      amount: this.amount,
+      amount: this.unit_amount,
       currency: this.currency,
       trial_period_days: this.parseTrialPeriodDays,
       product: this.product,

assets/javascripts/discourse/models/admin-subscription.js.es6

@@ -16,9 +16,7 @@ const AdminSubscription = EmberObject.extend({
 
   @discourseComputed("metadata")
   subscriptionUserPath(metadata) {
-    return getURL(
-      `/admin/users/${metadata.user_id}/${metadata.username}`
-    );
+    return getURL(`/admin/users/${metadata.user_id}/${metadata.username}`);
   },
 
   destroy() {

assets/javascripts/discourse/models/plan.js.es6

@@ -3,18 +3,22 @@ import discourseComputed from "discourse-common/utils/decorators";
 import { ajax } from "discourse/lib/ajax";
 
 const Plan = EmberObject.extend({
-  amountDollars: Ember.computed("amount", {
+  amountDollars: Ember.computed("unit_amount", {
     get() {
-      return parseFloat(this.get("amount") / 100).toFixed(2);
+      return parseFloat(this.get("unit_amount") / 100).toFixed(2);
     },
     set(key, value) {
       const decimal = parseFloat(value) * 100;
-      this.set("amount", decimal);
+      this.set("unit_amount", decimal);
       return value;
     }
   }),
+  @discourseComputed("recurring.interval")
+  billingInterval(interval) {
+    return interval || "one-time";
+  },
 
-  @discourseComputed("amountDollars", "currency", "interval")
+  @discourseComputed("amountDollars", "currency", "billingInterval")
   subscriptionRate(amountDollars, currency, interval) {
     return `${amountDollars} ${currency.toUpperCase()} / ${interval}`;
   }