Merge pull request #70 from chingu-voyage3/feature/upvote-answer

Upvote answer (closes #54)

server/controller/answers.js

@@ -99,6 +99,51 @@ exports.flag = async (ctx) => {
         ? { $pull: { flagged_by: user_id } }
         : { $addToSet: { flagged_by: user_id } };
 
+      await Answer.findOneAndUpdate(
+        { _id: ctx.params.id },
+        updates,
+        { new: true }
+      ).then((answer) => {
+        ctx.body = answer;
+      });
+    })
+    .catch((error) => {
+      ctx.body = { error };
+    });
+
+  return ctx.body;
+};
+
+exports.vote = async (ctx) => {
+  const { user_id } = ctx.request.body;
+
+  if (!user_id) {
+    ctx.body = { error: 'user_id is required' };
+    return ctx.body;
+  }
+
+  await Answer.findOne(
+    { _id: ctx.params.id },
+    '-_id voted_by',
+  )
+    .then(async (res) => {
+      if (!res) {
+        ctx.body = { error: 'Answer ID not found' };
+        return ctx.body;
+      }
+
+      const userVoted = res.voted_by.includes(user_id);
+
+      const updates = userVoted
+        ? {
+          $pull: { voted_by: user_id },
+          $inc: { votes: -1 },
+        }
+        : {
+          $addToSet: { voted_by: user_id },
+          $inc: { votes: 1 },
+        };
+
       await Answer.findOneAndUpdate(
         { _id: ctx.params.id },
         updates,

server/controller/index.js

@@ -58,7 +58,6 @@ exports.getId = async (ctx) => {
     });
 };
 
-
 exports.markSpam = async (ctx) => {
   const user = ctx.state.user.id;
   if (!user) {

server/index.js

@@ -38,6 +38,7 @@ router
   .get('/api/answers/:id', AnswerController.findAnswersById)
   .post('/api/answer', AnswerController.validateAnswer, AnswerController.addAnswer)
   .post('/api/answer/:id/flag', AnswerController.flag)
+  .post('/api/answer/:id/vote', AnswerController.vote)
   .post('/api/questions/:id/spam', QuestionController.markSpam);
 
 app

server/models/answer.js

@@ -5,6 +5,7 @@ const answerSchema = mongoose.Schema(
     question_id: { type: mongoose.Schema.Types.ObjectId, required: true },
     body: { type: String, required: true },
     votes: { type: Number, default: 0 },
+    voted_by: Array,
     flagged_by: Array,
     author: {
       _id: String,
@@ -14,7 +15,7 @@ const answerSchema = mongoose.Schema(
   },
   {
     timestamps: { createdAt: 'submitted_at', updatedAt: 'updated_at' },
-  },
+  }
 );
 
 const answerModel = mongoose.model('Answer', answerSchema);