Update db model

defines.js

 module.exports.OBJECT_STATUS = {
-    REMOVED: 0, // can be restored by teacher
-    ACTIVE: 1,
-    DELETED: 2, //can be watched and restore by admin
-    LOCKED: 3 //can not be edited
+    ACTIVE: 0,
+    LOCKED: 1, //can not be edited
+    REMOVED: 2, //can be restored by teacher
+    DELETED: 3 //can be watched and restore by admin
 };
 
 module.exports.COURSE_TYPES = {

task.js

@@ -183,7 +183,7 @@ module.exports.add = task => {
 
 module.exports.getActive = () => {
     return Task.find({
-        status: defines.OBJECT_STATUS.ACTIVE
+        status: {$lte: defines.OBJECT_STATUS.LOCKED }
     });
 };
 
@@ -194,21 +194,21 @@ module.exports.get = id => {
 module.exports.getMany = (ids) => {
     return Task.find({
         _id: {$in: ids},
-        status: defines.OBJECT_STATUS.ACTIVE
+        status: {$lte: defines.OBJECT_STATUS.LOCKED }
     });
 };
 
 module.exports.getManyShort = ids => {
     return Task.find({
         _id: {$in: ids},
-        status: defines.OBJECT_STATUS.ACTIVE
+        status: {$lte: defines.OBJECT_STATUS.LOCKED }
     }).select({name: 1, brief: 1, logo: 1});
 };
 
 module.exports.getForContest = contest => {
     return Task.find({
         contest,
-        status: defines.OBJECT_STATUS.ACTIVE
+        status: {$lte: defines.OBJECT_STATUS.LOCKED }
     }).sort({index: 1});
 };
 
@@ -219,7 +219,7 @@ module.exports.getShortForContest = contest => {
 module.exports.getCountForContest = contest => {
     return Task.countDocuments({
         contest,
-        status: defines.OBJECT_STATUS.ACTIVE
+        status: {$lte: defines.OBJECT_STATUS.LOCKED }
     });
 };
 
@@ -227,14 +227,14 @@ module.exports.getCountForContestAndVariant = (contest, variant) => {
     return Task.countDocuments({
         contest,
         variant,
-        status: defines.OBJECT_STATUS.ACTIVE
+        status: {$lte: defines.OBJECT_STATUS.LOCKED }
     });
 };
 
 module.exports.getForContests = contests => {
     return Task.find({
         contest: {$in: contests},
-        status: defines.OBJECT_STATUS.ACTIVE
+        status: {$lte: defines.OBJECT_STATUS.LOCKED }
     });
 };
 
@@ -242,7 +242,7 @@ module.exports.aggregateForContests = contests => {
     return Task.aggregate()
         .match({
             contest: {$in: contests},
-            status: defines.OBJECT_STATUS.ACTIVE
+            status: {$lte: defines.OBJECT_STATUS.LOCKED }
         })
         .group({
             _id: {contest: "$contest", variant: {$ifNull: ["$variant", 1]}},
@@ -260,7 +260,7 @@ module.exports.aggregateWeightForContests = contests => {
         .match({
             contest: {$in: contests},
             difficulty: defines.TASK_DIFFICULTY.USUAL,
-            status: defines.OBJECT_STATUS.ACTIVE
+            status: {$lte: defines.OBJECT_STATUS.LOCKED }
         })
         .group({
             _id: "$contest",
@@ -273,7 +273,7 @@ module.exports.aggregateWeightForContest = contest => {
         .match({
             contest,
             difficulty: defines.TASK_DIFFICULTY.USUAL,
-            status: defines.OBJECT_STATUS.ACTIVE
+            status: {$lte: defines.OBJECT_STATUS.LOCKED }
         })
         .group({
             _id: "$variant",
@@ -287,7 +287,7 @@ module.exports.aggregateWeightForContestAndVariant = (contest, variant) => {
             contest,
             variant,
             difficulty: defines.TASK_DIFFICULTY.USUAL,
-            status: defines.OBJECT_STATUS.ACTIVE
+            status: {$lte: defines.OBJECT_STATUS.LOCKED }
         })
         .group({
             _id: "$variant",
@@ -299,7 +299,7 @@ module.exports.getForVariantAndContest = (contest, variant, hard) => {
     return Task.find({
         contest,
         variant,
-        status: defines.OBJECT_STATUS.ACTIVE
+        status: {$lte: defines.OBJECT_STATUS.LOCKED }
     }).sort({index: 1});
 };
 
@@ -307,7 +307,7 @@ module.exports.getNearForVariantAndContestAndIndex = (contest, variant, index) =
     return Task.find({
         contest,
         variant,
-        status: defines.OBJECT_STATUS.ACTIVE,
+        status: {$lte: defines.OBJECT_STATUS.LOCKED },
         index: {$in: [index - 1, index + 1]}
     }).select({_id: 1, index: 1, contest: 1, variant: 1, difficulty: 1}).sort({index: 1});
 };
@@ -501,15 +501,19 @@ module.exports.removeForContest = contest => {
 };
 
 module.exports.removeManyForContest = (contest, ids) => {
-    return Task.updateMany({_id: {$in: ids}, contest}, { status:  defines.OBJECT_STATUS.REMOVED });
+    return Task.updateMany({_id: {$in: ids}, contest}, { status: defines.OBJECT_STATUS.REMOVED });
 };
 
 module.exports.activate = id => {
-    return Task.findOneAndUpdate({_id: id}, {status: defines.OBJECT_STATUS.ACTIVE});
+    return Task.findOneAndUpdate({_id: id}, {status: defines.OBJECT_STATUS.LOCKED });
+};
+
+module.exports.lock = id => {
+    return Task.findOneAndUpdate({_id: id}, {status: defines.OBJECT_STATUS.LOCKED });
 };
 
 module.exports.activateForContest = contest => {
-    return Task.updateMany({contest}, {status: defines.OBJECT_STATUS.ACTIVE});
+    return Task.updateMany({contest}, {status: defines.OBJECT_STATUS.ACTIVE });
 };
 
 module.exports.setStatusForContests = (contests, status) => {

test.js

@@ -65,9 +65,15 @@ const TestSchema = new mongoose.Schema({
     status: {
         type: Number,
         default: defines.OBJECT_STATUS.ACTIVE
+    },
+    isExample: {
+        type: Boolean,
+        default: false
     }
 });
 
+TestSchema.index({ index: 1 });
+
 const Test = mongoose.connection.model('Test', TestSchema);
 module.exports.schema = TestSchema;
 module.exports.model = Test;
@@ -85,28 +91,44 @@ module.exports.getManyShort = ids => {
 module.exports.getForContest = contest => {
     return Test.find({
         contest,
-        status: defines.OBJECT_STATUS.ACTIVE
+        status: {$lte: defines.OBJECT_STATUS.LOCKED }
     }).sort({index: 1});
 };
 
 module.exports.getForTask = task => {
     return Test.find({
         task,
-        status: defines.OBJECT_STATUS.ACTIVE
+        status: {$lte: defines.OBJECT_STATUS.LOCKED }
+    }).sort({index: 1});
+};
+
+module.exports.getExamplesForTask = task => {
+    return Test.find({
+        task,
+        status: {$lte: defines.OBJECT_STATUS.LOCKED },
+        isExample: true
+    }).sort({index: 1});
+};
+
+module.exports.getExamplesForContest = contest => {
+    return Test.find({
+        contest,
+        status: {$lte: defines.OBJECT_STATUS.LOCKED },
+        isExample: true
     }).sort({index: 1});
 };
 
 module.exports.getCountForContest = contest => {
     return Test.countDocuments({
         contest,
-        status: defines.OBJECT_STATUS.ACTIVE
+        status: {$lte: defines.OBJECT_STATUS.LOCKED }
     });
 };
 
 module.exports.getCountForTask = task => {
     return Test.countDocuments({
         task,
-        status: defines.OBJECT_STATUS.ACTIVE
+        status: {$lte: defines.OBJECT_STATUS.LOCKED }
     });
 };
 
@@ -126,6 +148,10 @@ 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.remove = id => {
     return Test.findOneAndUpdate({_id: id}, {status: defines.OBJECT_STATUS.REMOVED});
 };
@@ -135,7 +161,11 @@ module.exports.delete = id => {
 };
 
 module.exports.activate = id => {
-    return Test.findOneAndUpdate({_id: id}, {status: defines.OBJECT_STATUS.ACTIVE});
+    return Test.findOneAndUpdate({_id: id}, {status: defines.OBJECT_STATUS.ACTIVE });
+};
+
+module.exports.activateForTask = task => {
+    return Test.findOneAndUpdate({task}, {status: defines.OBJECT_STATUS.ACTIVE });
 };
 
 module.exports.erase = id => {