08-editing-posts.md.erb

---
title: Editer des Posts
slug: editing-posts
date: 0008/01/01
number: 8
points: 5
photoUrl: http://www.flickr.com/photos/ikewinski/9473337133/
photoAuthor: Mike Lewinski
contents: Add a form for editing your posts.|Set up edit permissions.|Restrict which properties can be edited.
paragraphs: 29
---

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~~~js
Router.configure({
  layoutTemplate: 'layout'
});

Router.map(function() {
  this.route('postsList', {path: '/'});

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

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

  this.route('postSubmit', {
    path: '/submit'
  });
});

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

Router.before(requireLogin, {only: 'postSubmit'});
~~~
<%= caption "lib/router.js" %>
<%= highlight "12~15" %>

### The Post Edit Template

////

~~~html
<template name="postEdit">
  <form class="main">
    <div class="control-group">
        <label class="control-label" for="url">URL</label>
        <div class="controls">
            <input name="url" type="text" value="{{url}}" placeholder="Your URL"/>
        </div>
    </div>

    <div class="control-group">
        <label class="control-label" for="title">Title</label>
        <div class="controls">
            <input name="title" type="text" value="{{title}}" placeholder="Name your post"/>
        </div>
    </div>

    <div class="control-group">
        <div class="controls">
            <input type="submit" value="Submit" class="btn btn-primary submit"/>
        </div>
    </div>
    <hr/>
    <div class="control-group">
        <div class="controls">
            <a class="btn btn-danger delete" href="#">Delete post</a>
        </div>
    </div>
  </form>
</template>
~~~
<%= caption "client/views/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/views/posts/post_edit.js" %>

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### 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">Discuss</a>
  </div>
</template>
~~~
<%= caption "client/views/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/views/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 Meteor.Collection('posts');

Posts.allow({
  update: ownsDocument,
  remove: ownsDocument
});

Meteor.methods({
  ...
~~~
<%= caption "collections/posts.js" %>
<%= highlight "3~6" %>

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

### Limiting Edits

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////

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

Posts.allow({
  update: ownsDocument,
  remove: ownsDocument
});

Posts.deny({
  update: function(userId, post, fieldNames) {
    // may only edit the following two fields:
    return (_.without(fieldNames, 'url', 'title').length > 0);
  }
});
~~~
<%= caption "collections/posts.js" %>
<%= highlight "8~13" %>

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

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<% note do %>

### Method Calls vs Client-side Data Manipulation

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

<% end %>