refactor update pkr

lib/model/wallet.js

@@ -89,15 +89,20 @@ Wallet.prototype.isShared = function() {
   return this.n > 1;
 };
 
+
+Wallet.prototype._updatePublicKeyRing = function() {
+  this.publicKeyRing = _.map(this.copayers, function(copayer) {
+    return _.pick(copayer, ['xPubKey', 'requestPubKey', 'isTemporaryRequestKey']);
+  });
+};
+
 Wallet.prototype.addCopayer = function(copayer) {
-  this.copayers.push(copayer);
 
+  this.copayers.push(copayer);
   if (this.copayers.length < this.n) return;
 
   this.status = 'complete';
-  this.publicKeyRing = _.map(this.copayers, function(copayer) {
-    return _.pick(copayer, ['xPubKey', 'requestPubKey', 'isTemporaryRequestKey']);
-  });
+  this._updatePublicKeyRing();
 };
 
 Wallet.prototype.updateCopayerRequestKey = function(copayerId, requestPubKey) {
@@ -108,13 +113,11 @@ Wallet.prototype.updateCopayerRequestKey = function(copayerId, requestPubKey) {
   });
 
   $.checkState(c)
-  .checkState(c.isTemporaryRequestKey);
+    .checkState(c.isTemporaryRequestKey);
 
   c.requestPubKey = requestPubKey;
   c.isTemporaryRequestKey = false;
-  this.publicKeyRing = _.map(this.copayers, function(copayer) {
-    return _.pick(copayer, ['xPubKey', 'requestPubKey', 'isTemporaryRequestKey']);
-  });
+  this._updatePublicKeyRing();
 };
 
 Wallet.prototype.getCopayer = function(copayerId) {