Adding forum / community page

- Adding the page. Fixes #17.
- Adding number of comments for community.
- Add sorting to that table.

server/migrations/2019-04-03-155205_create_community_view/up.sql

@@ -3,7 +3,8 @@ select *,
 (select name from user_ u where c.creator_id = u.id) as creator_name,
 (select name from category ct where c.category_id = ct.id) as category_name,
 (select count(*) from community_follower cf where cf.community_id = c.id) as number_of_subscribers,
-(select count(*) from post p where p.community_id = c.id) as number_of_posts
+(select count(*) from post p where p.community_id = c.id) as number_of_posts,
+(select count(*) from comment co, post p where c.id = p.community_id and p.id = co.post_id) as number_of_comments
 from community c;
 
 create view community_moderator_view as 

server/src/actions/community_view.rs

@@ -17,6 +17,7 @@ table! {
     category_name -> Varchar,
     number_of_subscribers -> BigInt,
     number_of_posts -> BigInt,
+    number_of_comments -> BigInt,
   }
 }
 
@@ -34,7 +35,8 @@ pub struct CommunityView {
   pub creator_name: String,
   pub category_name: String,
   pub number_of_subscribers: i64,
-  pub number_of_posts: i64
+  pub number_of_posts: i64,
+  pub number_of_comments: i64
 }
 
 impl CommunityView {

ui/src/components/communities.tsx

@@ -0,0 +1,80 @@
+import { Component, linkEvent } from 'inferno';
+import { Link } from 'inferno-router';
+import { Subscription } from "rxjs";
+import { retryWhen, delay, take } from 'rxjs/operators';
+import { UserOperation, Community, Post as PostI, GetPostResponse, PostResponse, Comment, CommentForm as CommentFormI, CommentResponse, CommentLikeForm, CommentSortType, CreatePostLikeResponse, ListCommunitiesResponse } from '../interfaces';
+import { WebSocketService, UserService } from '../services';
+import { msgOp, hotRank,mdToHtml } from '../utils';
+
+interface CommunitiesState {
+  communities: Array<Community>;
+}
+
+export class Communities extends Component<any, CommunitiesState> {
+  private subscription: Subscription;
+  private emptyState: CommunitiesState = {
+    communities: []
+  }
+
+  constructor(props, context) {
+    super(props, context);
+    this.state = this.emptyState;
+    this.subscription = WebSocketService.Instance.subject
+      .pipe(retryWhen(errors => errors.pipe(delay(3000), take(10))))
+      .subscribe(
+        (msg) => this.parseMessage(msg),
+        (err) => console.error(err),
+        () => console.log('complete')
+      );
+    WebSocketService.Instance.listCommunities();
+  }
+
+  render() {
+    return (
+      <div class="container-fluid">
+        <div class="table-responsive">
+          <table class="table table-sm table-hover" data-sortable>
+            <thead>
+              <tr>
+                <th>Name</th>
+                <th>Title</th>
+                <th>Category</th>
+                <th class="text-right">Subscribers</th>
+                <th class="text-right">Posts</th>
+                <th class="text-right">Comments</th>
+              </tr>
+            </thead>
+            <tbody>
+              {this.state.communities.map(community =>
+                <tr>
+                  <td><Link to={`/community/${community.id}`}>{community.name}</Link></td>
+                  <td>{community.title}</td>
+                  <td>{community.category_name}</td>
+                  <td class="text-right">{community.number_of_subscribers}</td>
+                  <td class="text-right">{community.number_of_posts}</td>
+                  <td class="text-right">{community.number_of_comments}</td>
+                </tr>
+              )}
+            </tbody>
+          </table>
+        </div>
+      </div>
+    );
+  }
+
+
+
+  parseMessage(msg: any) {
+    console.log(msg);
+    let op: UserOperation = msgOp(msg);
+    if (msg.error) {
+      alert(msg.error);
+      return;
+    } else if (op == UserOperation.ListCommunities) {
+      let res: ListCommunitiesResponse = msg;
+      this.state.communities = res.communities;
+      this.state.communities.sort((a, b) => b.number_of_subscribers - a.number_of_subscribers);
+      this.setState(this.state);
+    }
+  }
+}

ui/src/components/create-community.tsx

@@ -64,7 +64,7 @@ export class CreateCommunity extends Component<any, State> {
           <div class="form-group row">
             <label class="col-sm-2 col-form-label">Name</label>
             <div class="col-sm-10">
-              <input type="text" class="form-control" value={this.state.communityForm.name} onInput={linkEvent(this, this.handleCommunityNameChange)} required minLength={3} />
+              <input type="text" class="form-control" value={this.state.communityForm.name} onInput={linkEvent(this, this.handleCommunityNameChange)} required minLength={3} pattern="[a-z0-9_]+" title="lowercase, underscores, and no spaces."/>
             </div>
           </div>
           <div class="form-group row">

ui/src/components/navbar.tsx

@@ -37,7 +37,7 @@ export class Navbar extends Component<any, any> {
               <a class="nav-link" href={repoUrl}>About</a>
             </li>
             <li class="nav-item">
-              <a class="nav-link" href={repoUrl}>Forums</a>
+              <Link class="nav-link" to="/communities">Forums</Link>
             </li>
             <li class="nav-item">
               <Link class="nav-link" to="/create_post">Create Post</Link>

ui/src/components/sidebar.tsx

@@ -21,10 +21,13 @@ export class Sidebar extends Component<SidebarProps, SidebarState> {
     return (
       <div>
         <h4>{community.title}</h4>
+        <ul class="list-inline">
+          <li className="list-inline-item badge badge-light">{community.category_name}</li>
+          <li className="list-inline-item badge badge-light">{community.number_of_subscribers} Subscribers</li>
+          <li className="list-inline-item badge badge-light">{community.number_of_posts} Posts</li>
+          <li className="list-inline-item badge badge-light">{community.number_of_comments} Comments</li>
+        </ul>
         <div><button type="button" class="btn btn-secondary mb-2">Subscribe</button></div>
-        <div className="badge badge-light">{community.category_name}</div>
-        <div>{community.number_of_subscribers} Subscribers</div>
-        <div>{community.number_of_posts} Posts</div>
         <hr />
         {community.description && <div className="md-div" dangerouslySetInnerHTML={mdToHtml(community.description)} />}
       </div>

ui/src/index.html

@@ -10,6 +10,8 @@
   <link rel="stylesheet" href="https://bootswatch.com/4/darkly/bootstrap.min.css">
 	<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/balloon-css/0.5.0/balloon.min.css">
   <link href="https://fonts.googleapis.com/css?family=Open+Sans:300,400,400i,700,800" rel="stylesheet"> 
+  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/sortable/0.8.0/css/sortable-theme-minimal.min.css" />
+  <script src="https://cdnjs.cloudflare.com/ajax/libs/sortable/0.8.0/js/sortable.min.js"></script>
 </head>
 
 <body>

ui/src/index.tsx

@@ -8,6 +8,7 @@ import { CreatePost } from './components/create-post';
 import { CreateCommunity } from './components/create-community';
 import { Post } from './components/post';
 import { Community } from './components/community';
+import { Communities } from './components/communities';
 
 import './main.css';
 
@@ -33,6 +34,7 @@ class Index extends Component<any, any> {
             <Route path={`/login`} component={Login} />
             <Route path={`/create_post`} component={CreatePost} />
             <Route path={`/create_community`} component={CreateCommunity} />
+            <Route path={`/communities`} component={Communities} />
             <Route path={`/post/:id`} component={Post} />
             <Route path={`/community/:id`} component={Community} />
           </Switch>

ui/src/interfaces.ts

@@ -19,6 +19,7 @@ export interface Community {
   category_name: string;
   number_of_subscribers: number;
   number_of_posts: number;
+  number_of_comments: number;
   published: string;
   updated?: string;
 }