fix class iamges

app/service/course/v2/institution.js

@@ -95,7 +95,7 @@ class InstitutionSubService extends Service {
     const classHandle = [];
     if (classes.length > 0) {
       for (const v of classes) {
-        classHandle.push(ctx.classModel.V2.CourseImages.findOne({ where: { type: 2, type_id: v.id, status: 'online', is_deleted: 0, is_cover: 1 } }));
+        classHandle.push(ctx.classModel.V2.CourseImages.findOne({ where: { type: 2, type_id: v.id, status: 'online', is_deleted: 0 }, order: [[ 'sort', 'asc' ]] }));
       }
       const classImages = await Promise.all(classHandle).then(result => {
         return result;
@@ -592,7 +592,7 @@ class InstitutionSubService extends Service {
           images.push(v);
         }
       }
-      images = _.orderBy(images, [ 'is_cover', 'sort' ], [ 'desc', 'asc' ]);
+      images = _.orderBy(images, [ 'sort' ], [ 'asc' ]);
       classes.rows[i].image = images.length > 0 ? images[0] : {};
     }