allow task history to be omitted from task list calls

website/server/controllers/api-v3/tasks.js

@@ -395,14 +395,15 @@ api.getUserTasks = {
     const types = Tasks.tasksTypes.map(type => `${type}s`);
     types.push('completedTodos', '_allCompletedTodos'); // _allCompletedTodos is currently in BETA and is likely to be removed in future
     req.checkQuery('type', res.t('invalidTasksTypeExtra')).optional().isIn(types);
+    req.checkQuery('history', res.t('invalidHistoryBoolean')).optional().isBoolean();
 
     const validationErrors = req.validationErrors();
     if (validationErrors) throw validationErrors;
 
     const { user } = res.locals;
-    const { dueDate } = req.query;
+    const { dueDate, history } = req.query;
 
-    const tasks = await getTasks(req, res, { user, dueDate });
+    const tasks = await getTasks(req, res, { user, dueDate, history: history !== 'false' });
     return res.respond(200, tasks);
   },
 };

website/server/libs/tasks/index.js

@@ -151,6 +151,7 @@ async function getTasks (req, res, options = {}) {
     challenge,
     group,
     dueDate,
+    history = true,
   } = options;
 
   let query;
@@ -243,7 +244,11 @@ async function getTasks (req, res, options = {}) {
     }];
   }
 
-  const mQuery = Tasks.Task.find(query);
+  const projection = {};
+  if (!history) {
+    projection.history = 0;
+  }
+  const mQuery = Tasks.Task.find(query, projection);
   if (limit) mQuery.limit(limit);
   if (sort) mQuery.sort(sort);