fix

app/service/course/institution.js

@@ -22,8 +22,8 @@ class InstitutionService extends Service {
 
         //处理条件过滤条件
         let where = { status: 1, is_deleted: 0 };
-        if (cat) {
-            const cat_ret = await ctx.classModel.CourseCat.one({ where: { id: cat } });
+        if (cats) {
+            const cat_ret = await ctx.classModel.CourseCat.one({ where: { id: cats } });
             const cat_id = cat_ret.id;
             const cat_level = cat_ret.level;
             const next_level = cat_level + 1;