08-editing-posts.md.erb

---
title: Editing Posts
slug: editing-posts
date: 0008/01/01
number: 8
contents: Add a form for editing your posts.|Set up edit permissions.|Restrict which properties can be edited.
paragraphs: 30
---

////

////

~~~js
Router.configure({
  layoutTemplate: 'layout',
  loadingTemplate: 'loading',
  notFoundTemplate: 'notFound',
  waitOn: function() { return Meteor.subscribe('posts'); }
});

Router.route('/', {name: 'postsList'});

Router.route('/posts/:_id', {
  name: 'postPage',
  data: function() { return Posts.findOne(this.params._id); }
});

Router.route('/posts/:_id/edit', {
  name: 'postEdit',
  data: function() { return Posts.findOne(this.params._id); }
});

Router.route('/submit', {name: 'postSubmit'});

var requireLogin = function() {
  if (! Meteor.user()) {
    if (Meteor.loggingIn()) {
      this.render(this.loadingTemplate);
    } else {
      this.render('accessDenied');
    }
  } else {
    this.next();
  }
}

Router.onBeforeAction('dataNotFound', {only: 'postPage'});
Router.onBeforeAction(requireLogin, {only: 'postSubmit'});
~~~
<%= caption "lib/router.js" %>
<%= highlight "15~18" %>

### The Post Edit Template

////

~~~html
<template name="postEdit">
  <form class="main form">
    <div class="form-group">
      <label class="control-label" for="url">URL</label>
      <div class="controls">
          <input name="url" id="url" type="text" value="{{url}}" placeholder="Your URL" class="form-control"/>
      </div>
    </div>
    <div class="form-group">
      <label class="control-label" for="title">Title</label>
      <div class="controls">
          <input name="title" id="title" type="text" value="{{title}}" placeholder="Name your post" class="form-control"/>
      </div>
    </div>
    <input type="submit" value="Submit" class="btn btn-primary submit"/>
    <hr/>
    <a class="btn btn-danger delete" href="#">Delete post</a>
  </form>
</template>
~~~
<%= caption "client/templates/posts/post_edit.html" %>

////

~~~js
Template.postEdit.events({
  'submit form': function(e) {
    e.preventDefault();
    
    var currentPostId = this._id;
    
    var postProperties = {
      url: $(e.target).find('[name=url]').val(),
      title: $(e.target).find('[name=title]').val()
    }
    
    Posts.update(currentPostId, {$set: postProperties}, function(error) {
      if (error) {
        // display the error to the user
        alert(error.reason);
      } else {
        Router.go('postPage', {_id: currentPostId});
      }
    });
  },
  
  'click .delete': function(e) {
    e.preventDefault();
    
    if (confirm("Delete this post?")) {
      var currentPostId = this._id;
      Posts.remove(currentPostId);
      Router.go('postsList');
    }
  }
});
~~~
<%= caption "client/templates/posts/post_edit.js" %>

////

////

////

////

////

### Adding Links

////

~~~html
<template name="postItem">
  <div class="post">
    <div class="post-content">
      <h3><a href="{{url}}">{{title}}</a><span>{{domain}}</span></h3>
      <p>
        submitted by {{author}}
        {{#if ownPost}}<a href="{{pathFor 'postEdit'}}">Edit</a>{{/if}}
      </p>
    </div>
    <a href="{{pathFor 'postPage'}}" class="discuss btn btn-default">Discuss</a>
  </div>
</template>
~~~
<%= caption "client/templates/posts/post_item.html" %>
<%= highlight "5~8" %>

////

~~~js
Template.postItem.helpers({
  ownPost: function() {
    return this.userId === Meteor.userId();
  },
  domain: function() {
    var a = document.createElement('a');
    a.href = this.url;
    return a.hostname;
  }
});
~~~
<%= caption "client/templates/posts/post_item.js" %>
<%= highlight "2~4" %>

<%= screenshot "8-1", "Post edit form." %>

<%= commit "8-1", "Added edit posts form." %>

////

### Setting Up Permissions

////

////

~~~js
// check that the userId specified owns the documents
ownsDocument = function(userId, doc) {
  return doc && doc.userId === userId;
}
~~~
<%= caption "lib/permissions.js" %>

////

////

~~~js
Posts = new Mongo.Collection('posts');

Posts.allow({
  update: function(userId, post) { return ownsDocument(userId, post); },
  remove: function(userId, post) { return ownsDocument(userId, post); },
});

//...
~~~
<%= caption "lib/collections/posts.js" %>
<%= highlight "3~6" %>

<%= commit "8-2", "Added basic permission to check the post's owner." %>

### Limiting Edits

////

////

~~~js
Posts = new Mongo.Collection('posts');

Posts.allow({
  update: function(userId, post) { return ownsDocument(userId, post); },
  remove: function(userId, post) { return ownsDocument(userId, post); },
});

Posts.deny({
  update: function(userId, post, fieldNames) {
    // may only edit the following two fields:
    return (_.without(fieldNames, 'url', 'title').length > 0);
  }
});

//...
~~~
<%= caption "lib/collections/posts.js" %>
<%= highlight "8~13" %>

<%= commit "8-3", "Only allow changing certain fields of posts." %>

////

////

////

<% note do %>

### Method Calls vs Client-side Data Manipulation

////

////

////

////

////

- ////
- ////
- ////

////

<% end %>