Update task and tests model fns

task.js

@@ -11,6 +11,14 @@ const TaskSchema = new mongoose.Schema({
         type: Number,
         default: defines.OBJECT_STATUS.ACTIVE
     },
+    lock: {
+        reason: {
+            type: String
+        },
+        date: {
+            type: Date,
+        }
+    },
     created: {
         type: Date,
         default: Date.now
@@ -505,11 +513,17 @@ module.exports.removeManyForContest = (contest, ids) => {
 };
 
 module.exports.activate = id => {
-    return Task.findOneAndUpdate({_id: id}, {status: defines.OBJECT_STATUS.ACTIVE });
+    return Task.findOneAndUpdate({_id: id}, [{$set: {status: defines.OBJECT_STATUS.ACTIVE}}, {$unset: ["lock"]}]);
 };
 
-module.exports.lock = id => {
-    return Task.findOneAndUpdate({_id: id}, {status: defines.OBJECT_STATUS.LOCKED });
+module.exports.lock = (id, reason) => {
+    return Task.findOneAndUpdate({_id: id}, {
+        status: defines.OBJECT_STATUS.LOCKED,
+        lock: {
+            reason,
+            date: Date.now()
+        }
+    });
 };
 
 module.exports.activateForContest = contest => {

test.js

@@ -148,8 +148,14 @@ module.exports.getRemoved = task => {
     return Test.find({task, status: defines.OBJECT_STATUS.REMOVED})
 };
 
-module.exports.lockForTask = task => {
-    return Test.findOneAndUpdate({task}, {status: defines.OBJECT_STATUS.LOCKED });
+module.exports.lockForTask = (task, reason) => {
+    return Test.findOneAndUpdate({task}, {
+        status: defines.OBJECT_STATUS.LOCKED,
+        lock: {
+            reason,
+            date: Date.now()
+        }
+    });
 };
 
 module.exports.remove = id => {
@@ -161,11 +167,11 @@ module.exports.delete = id => {
 };
 
 module.exports.activate = id => {
-    return Test.findOneAndUpdate({_id: id}, {status: defines.OBJECT_STATUS.ACTIVE });
+    return Test.findOneAndUpdate({_id: id}, [{$set: {status: defines.OBJECT_STATUS.ACTIVE}}, {$unset: ["lock"]}]);
 };
 
 module.exports.activateForTask = task => {
-    return Test.findOneAndUpdate({task}, {status: defines.OBJECT_STATUS.ACTIVE });
+    return Test.findOneAndUpdate({task}, [{$set: {status: defines.OBJECT_STATUS.ACTIVE}}, {$unset: ["lock"]}]);
 };
 
 module.exports.erase = id => {