batch the deleting of change records

lib/persisted-model.js

@@ -1474,28 +1474,71 @@ module.exports = function(registry) {
     buildLookupOfAffectedModelData(Model, updates, function(err, currentMap) {
       if (err) return callback(err);
 
-      updates.forEach(function(update) {
+
+      var deleteIds = [];
+      var deleteConflicts = [];
+
+      updates.forEach(function (update) {
         var id = update.change.modelId;
         var current = currentMap[id];
         switch (update.type) {
           case Change.UPDATE:
-            tasks.push(function(cb) {
-              applyUpdate(Model, id, current, update.data, update.change, conflicts, options, cb);
+            tasks.push(function (cb) {
+              applyUpdate(
+                Model,
+                id,
+                current,
+                update.data,
+                update.change,
+                conflicts,
+                options,
+                cb
+              );
             });
             break;
 
           case Change.CREATE:
-            tasks.push(function(cb) {
-              applyCreate(Model, id, current, update.data, update.change, conflicts, options, cb);
+            tasks.push(function (cb) {
+              applyCreate(
+                Model,
+                id,
+                current,
+                update.data,
+                update.change,
+                conflicts,
+                options,
+                cb
+              );
             });
             break;
           case Change.DELETE:
-            tasks.push(function(cb) {
-              applyDelete(Model, id, current, update.change, conflicts, options, cb);
-            });
+            const conflictId = findDeleteConflicts(
+              Model,
+              id,
+              current,
+              update.change,
+              conflicts
+            );
+            if (!conflictId) {
+              deleteConflicts.push(conflictId);
+            } else {
+              deleteIds.push(id);
+            }
+
             break;
         }
       });
+      if (deleteConflicts.length) {
+        tasks.push(function (cb) {
+          rectifyDeleteChanges(Model, deleteConflicts, cb);
+        });
+      }
+
+      if (deleteIds.length) {
+        tasks.push(function (cb) {
+          applyDeletes(Model, deleteIds, update.change, conflicts, options, cb);
+        });
+      }
 
       async.parallel(tasks, function(err) {
         if (err) return callback(err);
@@ -1619,56 +1662,44 @@ module.exports = function(registry) {
     }
   }
 
-  function applyDelete(Model, id, current, change, conflicts, options, cb) {
+  /**
+   * Returns an id if there is a conflict, otherwise null
+   * @param {*} Model
+   * @param {*} id
+   * @param {*} current
+   * @param {*} change
+   * @param {*} conflicts
+   * @param {*} options
+   */
+  function findDeleteConflicts(Model, id, current, change, conflicts) {
     if (!current) {
       // The instance was either already deleted or not created at all,
       // we are done.
-      return cb();
+      return null;
     }
 
     var Change = Model.getChangeModel();
     var rev = Change.revisionForInst(current);
     if (rev !== change.prev) {
-      debug('Detected non-rectified change of %s %j',
-        Model.modelName, id);
+      debug('Detected non-rectified change of %s %j', Model.modelName, id);
       debug('\tExpected revision: %s', change.rev);
       debug('\tActual revision:   %s', rev);
       conflicts.push(change);
-      return Change.rectifyModelChanges(Model.modelName, [id], cb);
+      return id;
     }
+  }
+  function rectifyDeleteChanges(Model, ids, cb) {
+    return Change.rectifyModelChanges(Model.modelName, ids, cb);
+  }
 
-    Model.deleteById(id, options, function(err, result) {
+  function applyDeletes(Model, ids, change, conflicts, options, cb) {
+    var idName = this.getIdName();
+    var where = {};
+    where[idName] = { inq: ids };
+    Model.deleteAll(where, options, function (err) {
       if (err) return cb(err);
-
-      var count = result && result.count;
-      switch (count) {
-        case 1:
-          // The happy path, exactly one record was updated
-          return cb();
-
-        case 0:
-          debug('DeleteAll detected non-rectified change of %s %j',
-            Model.modelName, id);
-          conflicts.push(change);
-          // NOTE(bajtos) deleteAll triggers change rectification
-          // for all model instances, even when no records were updated,
-          // thus we don't need to rectify explicitly ourselves
-          return cb();
-
-        case undefined:
-        case null:
-          return cb(new Error(
-            g.f('Cannot apply bulk updates, ' +
-            'the connector does not correctly report ' +
-            'the number of deleted records.')));
-
-        default:
-          debug('%s.deleteAll modified unexpected number of instances: %j',
-            Model.modelName, count);
-          return cb(new Error(
-            g.f('Bulk update failed, the connector has deleted unexpected ' +
-            'number of records: %s', JSON.stringify(count))));
-      }
+      // all is good. exit gracefully, we deleted as much as we could!
+      return cb();
     });
   }