fix #1541: increasePostViewCount mutation + associated resolver; store posts viewed on the client session on postsViewed in the redux store; document PostsPage HOC & lifecycle hook

packages/nova-base-components/lib/posts/PostsPage.jsx

@@ -1,44 +1,104 @@
-import { Components, registerComponent, withDocument, withCurrentUser } from 'meteor/nova:core';
-import React from 'react';
+import { Components, registerComponent, withDocument, withCurrentUser, getActions, withMutation } from 'meteor/nova:core';
 import Posts from 'meteor/nova:posts';
+import React, { Component, PropTypes } from 'react';
+import { connect } from 'react-redux';
+import { bindActionCreators } from 'redux';
 
-const PostsPage = (props) => {
+class PostsPage extends Component {
+  
+  render() {
+    if (this.props.loading) {
+      
+      return <div className="posts-page"><Components.Loading/></div>
+      
+    } else {
+      
+      const post = this.props.document;
 
-  if (props.loading) {
+      const htmlBody = {__html: post.htmlBody};
 
-    return <div className="posts-page"><Components.Loading/></div>
+      return (
+        <div className="posts-page">
+          <Components.HeadTags url={Posts.getLink(post)} title={post.title} image={post.thumbnailUrl} description={post.excerpt} />
+          
+          <Components.PostsItem post={post} currentUser={this.props.currentUser} />
 
-  } else {
+          {post.htmlBody ? <div className="posts-page-body" dangerouslySetInnerHTML={htmlBody}></div> : null}
 
-    const post = props.document;
+          <Components.PostsCommentsThread terms={{postId: post._id}} />
 
-    const htmlBody = {__html: post.htmlBody};
-
-    return (
-      <div className="posts-page">
-        <Components.HeadTags url={Posts.getLink(post)} title={post.title} image={post.thumbnailUrl} description={post.excerpt} />
-        
-        <Components.PostsItem post={post} currentUser={props.currentUser} />
-
-        {post.htmlBody ? <div className="posts-page-body" dangerouslySetInnerHTML={htmlBody}></div> : null}
-
-        <Components.PostsCommentsThread terms={{postId: post._id}} />
-
-      </div> 
-    )
+        </div> 
+      );
+      
+    }
   }
-};
+  
+  // triggered after the component did mount on the client
+  async componentDidMount() {
+    try {
+      
+      // destructure the relevant props
+      const { 
+        // from the parent component, used in withDocument, GraphQL HOC
+        documentId,
+        // from connect, Redux HOC 
+        setViewed, 
+        postsViewed, 
+        // from withMutation, GraphQL HOC
+        increasePostViewCount,
+      } = this.props;
+      
+      // a post id has been found & it's has not been seen yet on this client session
+      if (documentId && !postsViewed.includes(documentId)) {
+        
+        // trigger the asynchronous mutation with postId as an argument
+        await increasePostViewCount({postId: documentId});
+        
+        // once the mutation is done, update the redux store
+        setViewed(documentId);
+      }
+      
+    } catch(error) {
+      console.log(error); // eslint-disable-line
+    }
+  }
+}
 
 PostsPage.displayName = "PostsPage";
 
 PostsPage.propTypes = {
-  document: React.PropTypes.object
+  documentId: PropTypes.string,
+  document: PropTypes.object,
+  postsViewed: PropTypes.array,
+  setViewed: PropTypes.func,
+  increasePostViewCount: PropTypes.func,
 }
 
-const options = {
+const queryOptions = {
   collection: Posts,
   queryName: 'postsSingleQuery',
   fragmentName: 'PostsPage',
 };
 
-registerComponent('PostsPage', PostsPage, withCurrentUser, [withDocument, options]);
+const mutationOptions = {
+  name: 'increasePostViewCount',
+  args: {postId: 'String'},
+};
+
+const mapStateToProps = state => ({ postsViewed: state.postsViewed });
+const mapDispatchToProps = dispatch => bindActionCreators(getActions().postsViewed, dispatch);
+
+registerComponent(
+  // component name used by Nova
+  'PostsPage', 
+  // React component 
+  PostsPage,
+  // HOC to give access to the current user
+  withCurrentUser, 
+  // HOC to load the data of the document, based on queryOptions & a documentId props
+  [withDocument, queryOptions], 
+  // HOC to provide a single mutation, based on mutationOptions
+  withMutation(mutationOptions), 
+  // HOC to give access to the redux store & related actions
+  connect(mapStateToProps, mapDispatchToProps)
+);

packages/nova-posts/lib/modules.js

@@ -13,5 +13,6 @@ import './emails.js';
 import './permissions.js';
 import './resolvers.js';
 import './mutations.js';
+import './redux.js';
 
-export default Posts;
+export default Posts;

packages/nova-posts/lib/mutations.js

@@ -1,4 +1,4 @@
-import { newMutation, editMutation, removeMutation } from 'meteor/nova:core';
+import { newMutation, editMutation, removeMutation, GraphQLSchema } from 'meteor/nova:core';
 import Users from 'meteor/nova:users';
 
 const performCheck = (mutation, user, document) => {
@@ -85,4 +85,6 @@ const mutations = {
 
 };
 
-export default mutations;
+GraphQLSchema.addMutation('increasePostViewCount(postId: String): Float');
+
+export default mutations;

packages/nova-posts/lib/redux.js

@@ -0,0 +1,23 @@
+import { addAction, addReducer } from 'meteor/nova:core';
+
+addAction({
+  postsViewed: {
+    setViewed: (postId) => ({
+      type: 'SET_VIEWED',
+      postId,
+    }),
+  },
+});
+
+addReducer({
+  postsViewed: (state = [], action) => {
+    if (action.type === 'SET_VIEWED') {
+      return [
+        ...state,
+        action.postId,
+      ];
+    }
+    
+    return state;
+  },
+});

packages/nova-posts/lib/resolvers.js

@@ -6,6 +6,11 @@ const specificResolvers = {
       return context.Users.findOne({ _id: post.userId }, { fields: context.getViewableFields(context.currentUser, context.Users) });
     },
   },
+  Mutation: {
+    increasePostViewCount(root, { postId }, context) {
+      return context.Posts.update({_id: postId}, { $inc: { viewCount: 1 }});
+    }
+  }
 };
 
 GraphQLSchema.addResolvers(specificResolvers);