{"id":757,"date":"2015-08-26T19:52:40","date_gmt":"2015-08-26T19:52:40","guid":{"rendered":"https:\/\/www.codexworld.com\/?p=757"},"modified":"2015-08-26T20:22:13","modified_gmt":"2015-08-26T20:22:13","slug":"cakephp-tutorial-part-2-add-edit-delete-operations","status":"publish","type":"post","link":"https:\/\/www.codexworld.com\/cakephp-tutorial-part-2-add-edit-delete-operations\/","title":{"rendered":"CakePHP Tutorial Part 2: Add, Edit and Delete Operations"},"content":{"rendered":"

In our previous CakePHP 3.x Tutorial<\/a> we have learned CakePHP framework installation, configuration, database creation, data listing and basic functionalities. Now we’ll be know about the CakePHP’s advanced functionality through creating a blog post application as an example. <\/p>\n

Basic configuration and blog posts listing already have discussed in our previous tutorial. So before starting the advanced tutorial, you can see the CakePHP 3.x Tutorial for Beginners<\/a>. In this advanced cakephp tutorial we’ll implement the functionality to add, edit, and delete blog posts.<\/p>\n

\"cakephp-tutorial-blog-post-add-edit-delete-operations-by-codexworld\"<\/div>\n

Adding Posts<\/h2>\n

Controller:<\/b>
\nindex()<\/code> function fetch posts from the database and showing the posts. Now let\u2019s allow for the adding of new posts.
\nFor showing success and error message you should need to load the FlashComponent in the PostsController. At first create add()<\/code> action in the PostsController. add()<\/code> action render the view of post adding form and try to save the data using the Posts model if the HTTP method of the request was POST. This action also used for show the validation errors or other warnings.<\/p>\n

<?php
<\/span>\/\/ src\/Controller\/PostsController.php

<\/span>namespace <\/span>App<\/span>\\<\/span>Controller<\/span>;

class <\/span>PostsController <\/span>extends <\/span>AppController
<\/span>{
    public function <\/span>initialize<\/span>()
    {
        <\/span>parent<\/span>::<\/span>initialize<\/span>();

        <\/span>$this<\/span>-><\/span>loadComponent<\/span>(<\/span>'Flash'<\/span>); <\/span>\/\/ Include the FlashComponent
    <\/span>}
    
    public function <\/span>index<\/span>()
    {
        <\/span>$posts <\/span>= <\/span>$this<\/span>-><\/span>Posts<\/span>-><\/span>find<\/span>(<\/span>'all'<\/span>);
        <\/span>$this<\/span>-><\/span>set<\/span>(<\/span>compact<\/span>(<\/span>'posts'<\/span>));
    }
    
    public function <\/span>add<\/span>()
    {
        <\/span>$post <\/span>= <\/span>$this<\/span>-><\/span>Posts<\/span>-><\/span>newEntity<\/span>();
        if (<\/span>$this<\/span>-><\/span>request<\/span>-><\/span>is<\/span>(<\/span>'post'<\/span>)) {
            <\/span>$post <\/span>= <\/span>$this<\/span>-><\/span>Posts<\/span>-><\/span>patchEntity<\/span>(<\/span>$post<\/span>, <\/span>$this<\/span>-><\/span>request<\/span>-><\/span>data<\/span>);
            <\/span>$post<\/span>-><\/span>created <\/span>= <\/span>date<\/span>(<\/span>\"Y-m-d H:i:s\"<\/span>);
            <\/span>$post<\/span>-><\/span>modified <\/span>= <\/span>date<\/span>(<\/span>\"Y-m-d H:i:s\"<\/span>);
            if (<\/span>$this<\/span>-><\/span>Posts<\/span>-><\/span>save<\/span>(<\/span>$post<\/span>)) {
                <\/span>$this<\/span>-><\/span>Flash<\/span>-><\/span>success<\/span>(<\/span>__<\/span>(<\/span>'Your post has been saved.'<\/span>));
                return <\/span>$this<\/span>-><\/span>redirect<\/span>([<\/span>'action' <\/span>=> <\/span>'index'<\/span>]);
            }
            <\/span>$this<\/span>-><\/span>Flash<\/span>-><\/span>error<\/span>(<\/span>__<\/span>(<\/span>'Unable to add your post.'<\/span>));
        }
        <\/span>$this<\/span>-><\/span>set<\/span>(<\/span>'post'<\/span>, <\/span>$post<\/span>);
    }
}<\/span><\/span><\/pre>\n
newEntity()<\/code> is creating a new entity and passing it to the save()<\/code> method in the Table class.
\npatchEntity()<\/code> merge an array of raw data into an existing entity.<\/p>\n
Model:<\/b>
\nFor data validation you need to create src\/Model\/Table\/PostsTable.php<\/code> model and define the validation rules. validationDefault()<\/code> method tells CakePHP how to validate your data when the save method is called. We have specified here title and description should not be empty.<\/p>\n
<?php
<\/span>\/\/ src\/Model\/Table\/PostsTable.php

<\/span>namespace <\/span>App<\/span>\\<\/span>Model<\/span>\\<\/span>Table<\/span>;

use <\/span>Cake<\/span>\\<\/span>ORM<\/span>\\<\/span>Table<\/span>;
use <\/span>Cake<\/span>\\<\/span>Validation<\/span>\\<\/span>Validator<\/span>;

class <\/span>PostsTable <\/span>extends <\/span>Table
<\/span>{
    public function <\/span>initialize<\/span>(array <\/span>$config<\/span>)
    {
        <\/span>$this<\/span>-><\/span>addBehavior<\/span>(<\/span>'Timestamp'<\/span>);
    }

    public function <\/span>validationDefault<\/span>(<\/span>Validator $validator<\/span>)
    {
        <\/span>$validator
            <\/span>-><\/span>notEmpty<\/span>(<\/span>'title'<\/span>)
            -><\/span>notEmpty<\/span>(<\/span>'description'<\/span>);

        return <\/span>$validator<\/span>;
    }
}<\/span><\/span><\/pre>\n
View:<\/b>
\nOur src\/Template\/Posts\/add.ctp<\/code> view would be look like below. You’ll need to use CakePHP’s FormHelper to take advantage of the validation features.<\/p>\n
<!-- File: src\/Template\/Posts\/add.ctp --><\/span>\r\n\r\n<h1<\/span>>Add Blog Post<\/h1<\/span>>\r\n<?php
    <\/span>echo <\/span>$this<\/span>-><\/span>Form<\/span>-><\/span>create<\/span>(<\/span>$post<\/span>);
    echo <\/span>$this<\/span>-><\/span>Form<\/span>-><\/span>input<\/span>(<\/span>'title'<\/span>);
    echo <\/span>$this<\/span>-><\/span>Form<\/span>-><\/span>input<\/span>(<\/span>'description'<\/span>, [<\/span>'rows' <\/span>=> <\/span>'3'<\/span>]);
    echo <\/span>$this<\/span>-><\/span>Form<\/span>-><\/span>button<\/span>(<\/span>__<\/span>(<\/span>'Save Post'<\/span>));
    echo <\/span>$this<\/span>-><\/span>Form<\/span>-><\/span>end<\/span>();
<\/span>?><\/span><\/span><\/pre>\n
\"cakephp-tutorial-add-blog-post-by-codexworld\"<\/div>\n
Now update the src\/Template\/Posts\/index.ctp<\/code> view with “Add New Post” link.<\/p>\n
<?= $this<\/span>-><\/span>Html<\/span>-><\/span>link<\/span>(<\/span>'Add New Post'<\/span>, [<\/span>'action' <\/span>=> <\/span>'add'<\/span>]) <\/span>?><\/span><\/span><\/pre>\n
Editing Posts<\/h2>\n
Controller:<\/b>
\nedit()<\/code> action first ensures that the user has passed an $id<\/code> parameter to access an existing record. If they haven’t passed or the post does not exists, throw a NotFoundException.<\/p>\n
public function <\/span>edit<\/span>(<\/span>$id <\/span>= <\/span>null<\/span>)
{
    <\/span>$post <\/span>= <\/span>$this<\/span>-><\/span>Posts<\/span>-><\/span>get<\/span>(<\/span>$id<\/span>);
    if (<\/span>$this<\/span>-><\/span>request<\/span>-><\/span>is<\/span>([<\/span>'post'<\/span>,<\/span>'put'<\/span>])) {
        <\/span>$post <\/span>= <\/span>$this<\/span>-><\/span>Posts<\/span>-><\/span>patchEntity<\/span>(<\/span>$post<\/span>, <\/span>$this<\/span>-><\/span>request<\/span>-><\/span>data<\/span>);
        <\/span>$post<\/span>-><\/span>modified <\/span>= <\/span>date<\/span>(<\/span>\"Y-m-d H:i:s\"<\/span>);
        if (<\/span>$this<\/span>-><\/span>Posts<\/span>-><\/span>save<\/span>(<\/span>$post<\/span>)) {
            <\/span>$this<\/span>-><\/span>Flash<\/span>-><\/span>success<\/span>(<\/span>__<\/span>(<\/span>'Your post has been updated.'<\/span>));
            return <\/span>$this<\/span>-><\/span>redirect<\/span>([<\/span>'action' <\/span>=> <\/span>'index'<\/span>]);
        }
        <\/span>$this<\/span>-><\/span>Flash<\/span>-><\/span>error<\/span>(<\/span>__<\/span>(<\/span>'Unable to update your post.'<\/span>));
    }
    <\/span>$this<\/span>-><\/span>set<\/span>(<\/span>'post'<\/span>, <\/span>$post<\/span>);
}<\/span><\/span><\/pre>\n
View:<\/b>
\nsrc\/Template\/Posts\/edit.ctp<\/code> view might be look like this.<\/p>\n
<!-- File: src\/Template\/Posts\/edit.ctp --><\/span>\r\n\r\n<h1<\/span>>Edit Post<\/h1<\/span>>\r\n<?php
    <\/span>echo <\/span>$this<\/span>-><\/span>Form<\/span>-><\/span>create<\/span>(<\/span>$post<\/span>);
    echo <\/span>$this<\/span>-><\/span>Form<\/span>-><\/span>input<\/span>(<\/span>'title'<\/span>);
    echo <\/span>$this<\/span>-><\/span>Form<\/span>-><\/span>input<\/span>(<\/span>'description'<\/span>, [<\/span>'rows' <\/span>=> <\/span>'3'<\/span>]);
    echo <\/span>$this<\/span>-><\/span>Form<\/span>-><\/span>button<\/span>(<\/span>__<\/span>(<\/span>'Save Post'<\/span>));
    echo <\/span>$this<\/span>-><\/span>Form<\/span>-><\/span>end<\/span>();
<\/span>?><\/span><\/span><\/pre>\n
\"cakephp-tutorial-edit-blog-post-by-codexworld\"<\/div>\n
Now update the src\/Template\/Posts\/index.ctp<\/code> view with “Edit Post” link.<\/p>\n
<?= $this<\/span>-><\/span>Html<\/span>-><\/span>link<\/span>(<\/span>'Edit'<\/span>, [<\/span>'action' <\/span>=> <\/span>'edit'<\/span>, <\/span>$post<\/span>-><\/span>id<\/span>]) <\/span>?><\/span><\/span><\/pre>\n
Deleting Posts<\/h2>\n
Controller:<\/b>
\nLet’s allow user to delete posts by creating a delete()<\/code> action in PostsController. delete()<\/code> action deletes post specified by $id<\/code>. After deleting the post user would be redirected to the index page.<\/p>\n
public function <\/span>delete<\/span>(<\/span>$id<\/span>)
{
    <\/span>$this<\/span>-><\/span>request<\/span>-><\/span>allowMethod<\/span>([<\/span>'post'<\/span>, <\/span>'delete'<\/span>]);

    <\/span>$post <\/span>= <\/span>$this<\/span>-><\/span>Posts<\/span>-><\/span>get<\/span>(<\/span>$id<\/span>);
    if (<\/span>$this<\/span>-><\/span>Posts<\/span>-><\/span>delete<\/span>(<\/span>$post<\/span>)) {
        <\/span>$this<\/span>-><\/span>Flash<\/span>-><\/span>success<\/span>(<\/span>__<\/span>(<\/span>'The post with id: {0} has been deleted.'<\/span>, <\/span>h<\/span>(<\/span>$id<\/span>)));
        return <\/span>$this<\/span>-><\/span>redirect<\/span>([<\/span>'action' <\/span>=> <\/span>'index'<\/span>]);
    }
}<\/span><\/span><\/pre>\n
Now update the src\/Template\/Posts\/index.ctp<\/code> view with Delte Post link. Also it will better if you show the confirmation message once the Delete link is clicked.  $this->Form->postLink()<\/code> creates a link with JavaScript confirm alert for preventing the accidental click.<\/p>\n
<?= $this<\/span>-><\/span>Form<\/span>-><\/span>postLink<\/span>(
    <\/span>'Delete'<\/span>,
    [<\/span>'action' <\/span>=> <\/span>'delete'<\/span>, <\/span>$post<\/span>-><\/span>id<\/span>],
    [<\/span>'confirm' <\/span>=> <\/span>'Are you sure?'<\/span>])
<\/span>?><\/span><\/span><\/pre>\n
Testing<\/h2>\n
Go to the homepage page (http:\/\/localhost\/cakephp\/<\/code>) => you can see posts list with working add, edit and delete links.<\/p>\n
\"cakephp-tutorial-blog-post-listing-by-codexworld\"<\/div>\n","protected":false},"excerpt":{"rendered":"
In our previous CakePHP 3.x Tutorial we have learned CakePHP framework installation, configuration, database creation, data listing and basic functionalities. 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