showing realted blogs by creating blogListRelated routes and controller

Author: pramit-marattha

server/controllers/blog.js

@@ -269,4 +269,23 @@ exports.photo =(req,res)=>{
         res.set('Content-Type',blog.photo.contentType)
         return res.send(blog.photo.data);
     })
-};
+};
+
+exports.blogListRelated=(req,res)=>{
+    let limit = req.body.limit ? parseInt(req.body.limit) : 3
+
+    const {_id,categories} = req.body.blog
+
+    // not including _id but including categories
+    // while showing related blogs excluding the blog itself and showing other blogs instead
+    Blog.find({_id: {$ne: _id},categories: {$in: categories}}).limit(limit).populate('postedBy','_id name profile').select('slug excerpt postedBy createdAt updatedAt')
+    .exec((err,blogs)=>{
+        if (err){
+            return res.status(400).json({
+                error: "Blog not found"
+            })
+            res.json(blogs)
+        }
+    })
+
+}