Add apiProxySettings helper

proxy_backends/client/form/form.html

@@ -3,6 +3,7 @@
     collection=proxyBackendsCollection
     id="insertProxyBackend"
     type=formType
+    doc=apiProxySettings
   }}
 
     <!-- hidden fields, auto-value -->

proxy_backends/client/form/form.js

@@ -56,6 +56,15 @@ Template.proxyBackendForm.helpers({
 
     return port;
   },
+  apiProxySettings () {
+    // Get API ID
+    const apiId = this.api._id;
+
+    // Look for existing proxy backend document for this API
+    const apiProxySettings = ProxyBackends.findOne({ apiId });
+
+    return apiProxySettings;
+  },
   formType () {
     // Placeholder for form type
     let formType;