Merge branch 'master' of https://github.com/browngraphicslab/Dash-Web into hannah_linking

1 files changed, 19 insertions, 0 deletions

diff --git a/src/fields/Document.ts b/src/fields/Document.ts
index 5b91de6ed..0c156b282 100644
--- a/src/fields/Document.ts
+++ b/src/fields/Document.ts
@@ -102,6 +102,25 @@ export class Document extends Field {
         return false;
     }
 
+    GetOrCreateAsync<T extends Field>(key: Key, ctor: { new(): T }, callback: (field: T) => void): void {
+        //This currently doesn't deal with prototypes
+        if (this._proxies.has(key.Id)) {
+            Server.GetDocumentField(this, key, (field) => {
+                if (field && field instanceof ctor) {
+                    callback(field);
+                } else {
+                    let newField = new ctor();
+                    this.Set(key, newField);
+                    callback(newField);
+                }
+            });
+        } else {
+            let newField = new ctor();
+            this.Set(key, newField);
+            callback(newField);
+        }
+    }
+
     GetT<T extends Field = Field>(key: Key, ctor: { new(...args: any[]): T }, ignoreProto: boolean = false): FieldValue<T> {
         var getfield = this.Get(key, ignoreProto);
         if (getfield != FieldWaiting) {