Added comment counts to posts (udacity#21)

* Added comment counts to posts

- adding or removing a comment increments the comment count for that
  post
- cleaned up ununsed packages in package.json
- added starting comment counts to the default post data
- updated the server-api README with notes about commentCounts

Author: jamesbibby

Diff for: api-server/README.md

@@ -20,6 +20,9 @@ fetch(
 )
 ```
 
+### Comment Counts
+Posts retrieved in a list or individually now contain comment counts in the format `post: { commentCount: 0 }`.  This should make it easier to display the number of comments a post has without having to call the comments endpoint for each post.   This count is updated whenever a comment is added or deleted via the `POST /comments` or `DELETE /comments/:id` endpoints.
+
 ### API Endpoint
 
 The following endpoints are available:

Diff for: api-server/comments.js

@@ -1,4 +1,5 @@
 const clone = require('clone')
+const posts = require('./posts')
 
 let db = {}
 
@@ -68,6 +69,7 @@ function add (token, comment) {
       parentDeleted: false
     }
 
+    posts.incrementCommentCounter(token, comment.parentId, 1)
     res(comments[comment.id])
   })
 }
@@ -104,6 +106,7 @@ function disable (token, id) {
     return new Promise((res) => {
       let comments = getData(token)
       comments[id].deleted = true
+      posts.incrementCommentCounter(token, comments[id].parentId, -1)
       res(comments[id])
     })
 }

Diff for: api-server/package.json

@@ -16,10 +16,6 @@
     "cors": "^2.8.3",
     "dotenv": "^4.0.0",
     "express": "^4.15.2",
-    "clone": "^2.1.1",
-    "redux":"^3.7.2",
-    "react-redux":"^5.0.5",
-    "react-router":"^4.1.1",
-    "react-router-dom":"4.1.1"
+    "clone": "^2.1.1"
   }
  }

Diff for: api-server/posts.js

@@ -11,7 +11,8 @@ const defaultData = {
     author: 'thingtwo',
     category: 'react',
     voteScore: 6,
-    deleted: false
+    deleted: false,
+    commentCount: 2
   },
   "6ni6ok3ym7mf1p33lnez": {
     id: '6ni6ok3ym7mf1p33lnez',
@@ -21,7 +22,8 @@ const defaultData = {
     author: 'thingone',
     category: 'redux',
     voteScore: -5,
-    deleted: false
+    deleted: false,
+    commentCount: 0
   }
 }
 
@@ -74,7 +76,8 @@ function add (token, post) {
       author: post.author,
       category: post.category,
       voteScore: 1,
-      deleted: false
+      deleted: false,
+      commentCount: 0
     }
 
     res(posts[post.id])
@@ -117,6 +120,13 @@ function edit (token, id, post) {
     })
 }
 
+function incrementCommentCounter(token, id, count) {
+  const data = getData(token)
+  if (data[id]) {
+    data[id].commentCount += count
+  }
+}
+
 module.exports = {
   get,
   getAll,
@@ -125,5 +135,6 @@ module.exports = {
   vote,
   disable,
   edit,
-  getAll
+  getAll,
+  incrementCommentCounter
 }