Building a personal blog with Craft CMS, React and Element API / Part 2 - Creating a blog in Craft

This is part 2 of my tutorial on building a blog site with React front-end and Craft CMS. If you missed the first one, you can find it here.

All the code for this tutorial is available on github.

In this part, we are going to set up a blog in Craft CMS, then expose the content with Element API.

Step 5 - Enabling extensions

In the last part, we told composer that we need Redactor and Element API, but in Craft, they are not yet enabled.

To enable them, navigate to your Craft admin panel, and then to Settings -> Plugins. You should see Element API and Redactor here. Just click on the gear icon next to both and click Install.

Step 6 - Setting up a simple blog in Craft

Let's start by creating our blog section. A section is a collection of entries. In Craft, an entry is the fundamental unit of content. For our website, every blog post will be a different entry of section 'blog'. Entries can also be single pages, structures of pages, or anything you want, really.

To Start, navigate to your Craft admin panel, and then to Settings -> Sections. Click on New Section, and give your section the name 'Blog'. Set the handle to 'blog' and section type to 'Channel'. The uri format should be 'blog/{slug}' and template 'index'. Click Save to save this section.

We'll also want to have a home page on our site, so let's create that one as well. Click again on New Section, and give this section the name 'Home'. Set the handle to 'home' and section type to 'Single'. Enable the little home checkmark button and select the template 'index'. Click on Save again.

Now, if we want our site to have images, we need to create an asset volume. To create an asset volume, navigate to Settings -> Assets, and click on New volume. Set the name to 'Images' and handle to 'images'. Set 'Assets in this volume have public URLs' to true, and the base url to '/assets/images'. The volume type should be set to 'Local Folder', and the file system path to '@webroot/assets/images'. Click Save.

The next thing to do, is to add some fields to our sections. Fields are units of data associated with an entry. To add some fields, navigate to Settings -> Fields, and click on the Common group on the left. Click on New Field, and make the name of our field 'Post Content'. Set the handle to 'postContent', and the instructions to something like 'The content of this post or page.'

The type of this field will be 'Matrix'. A Matrix field is a field, that contains blocks of different types of data. These blocks can be in any order, and you can have as many blocks as you'd like. For example, our Matrix will contain two types of blocks: text and images. In a more complex website, there could be many more different block types to choose from.

Once our Field type is set to 'Matrix' a Configuration table will appear. Click on New block type, and set the name to 'Text' and handle to 'text'. In the field settings, set the name to 'Text' again, and handle to 'text'. Set 'this field is required' to true, and the field type to 'Redactor' or 'Rich Text', depending on your version. If you want to allow inline styles, go to Advanced and untick 'Remove inline styles'.

Click on New block type again, and set the name to 'Image' and handle to 'image'. Set the name of the field to 'Image' and handle to 'image' again. Tick 'This field is required', and set the field type to 'Assets'. Set 'Restrict uploads to a single folder?' to true, and set the upload location as our asset volume 'Images'. Set 'Restrict allowed file types?' to true, and select 'Image' as the allowed file type. Set the limit to '1'. You can now click Save to save our field.

Let's create a few more fields, but this time in a different group. Still in the 'Fields' settings, click on New Group, and set the name of the group to 'Blog'. In the blog group, create a new field called 'Feature Image', with the handle of 'featureImage' and a type of 'Assets'. Set again the restriction to our Image asset volume, and the allowed file type to 'Image'. Set the limit to 1. Click Save, and add another field called 'Excerpt' with the handle of 'excerpt'. Set the field type to 'Plain Text' and field limit to 100 characters. Click Save.

Now that we have some fields, we need to add them to our sections. Navigate to Settings -> Sections, and click on Edit entry types (1) in our blog section. Click on Blog. In the field layout section, drag the entire 'Blog' box into the layout, and add the 'Post Content' field from 'Common'. Click Save.

Also edit the 'Home' entry type, and drag the 'Common' box into the field layout. Click Save.

At this point, you should go create some content for testing. Navigate to Entries on the side bar, add some text to the Home page and create at least a few blog posts. Add some images to the pages as well.

After you're done, make two more fields in a new group called 'Site Settings'. One image field for the site Logo, with the handle 'logo', and one plain text field for the footer text, with the handle of 'footerText'.

Next, navigate to Settings -> Globals and create a new global set. Give it the name 'Site Settings' and handle 'siteSettings'. Add the fields we created to the field layout and click Save. You can now choose a logo for your site, and set the footer text in the 'Globals' section in the sidebar.

Step 7 - Setting up Element API

Setting up Element API is a fairly simple process. All we have to do, is to create a file called element-api.php in our project's config/ folder, and paste the following contents:

<?php

use craft\elements\Entry;
use craft\elements\GlobalSet;
use craft\helpers\UrlHelper;


return [
    'endpoints' => [
        'site.json' => function() {
            return[
                'elementType' => 'craft\elements\GlobalSet',
                'criteria' => ['handle' => 'siteSettings'],
                'transformer' => function(GlobalSet $entry) {
                    $logo = $entry->logo->one();

                    return [
                        'logo' => $logo ? $logo->getUrl(['height' => 100]) : null,
                        'footerText' => $entry->footerText,
                    ];
                },
                'one' => true,
                'meta' => [
                    'type' => 'sitedata'
                ],
            ];
        },
    ]
];

This will create an api endpoint to /site.json that returns our Site Settings as a json file. What Element API does is whenever the specified endpoint is called, it creates an 'element query' that finds the requested data from Craft's database.

The elementType field is the type of element we are trying to find.
The criteria field is our search criteria.
The transformer method transforms the result of the query to an output Json object.
The one parameter tells Element API that we are expecting only a single result
The meta field can contain any arbitrary data that we want to send with the result. Here we are sending the type of this response, which is 'sitedata'

After you've created the file, you can point your browser to http://localhost:3001/site.json , and you should find that craft returns the Site Settings you've entered as a neat json file.

// http://localhost:3001/site.json
{
  "logo": "/assets/images/_AUTOx100_crop_center-center_none/test_gradient_1_512.jpg",
  "footerText": "Copyright me",
  "meta": {
    "type": "sitedata"
  }
}

Another thing we probably want to know from our website is the different pages that exist. To query for all Single entries, we need to modify our code to fetch them:

<?php

use craft\elements\Entry;
use craft\elements\GlobalSet;
use craft\helpers\UrlHelper;
use craft\helpers\ArrayHelper;
use craft\models\Section;

return [
    'endpoints' => [
        'site.json' => function() {
            return[
                'elementType' => 'craft\elements\GlobalSet',
                'criteria' => ['handle' => 'siteSettings'],
                'transformer' => function(GlobalSet $entry) {
                    $logo = $entry->logo->one();

                    $singleSections = ArrayHelper::where(\Craft::$app->sections->getAllSections(), 
                    'type', Section::TYPE_SINGLE);

                    $pages = Entry::find()
                        ->sectionId(ArrayHelper::getColumn($singleSections, 'id'))
                        ->all();

                    $pageInfos = [];

                    foreach ($pages as $page) {
                        $pageInfos[] = [
                            'title' => $page->title,
                            'url' => $page->url,
                            'jsonUrl' => UrlHelper::url("{$page->slug}.json")
                        ];
                    }

                    $pageInfos[] = [
                        'title' => 'Blog',
                        'url' => UrlHelper::url("blog/"),
                        'jsonUrl' => UrlHelper::url("blog.json")
                    ];

                    return [
                        'logo' => $logo ? $logo->getUrl(['height' => 100]) : null,
                        'footerText' => $entry->footerText,
                        'pages' => $pageInfos
                    ];
                },
                'one' => true,
                'meta' => [
                    'type' => 'sitedata'
                ],
            ];
        },
    ]
];

The above code makes a second query inside the transformer to find all the Single pages. Because our /blog endpoint is not a Single, we have to add it manually to the list. Now, our endpoint should return something like this:

// http://localhost:3001/site.json
{
  "logo": "/assets/images/_AUTOx100_crop_center-center_none/test_gradient_1_512.jpg",
  "footerText": "Copyright me",
  "pages": [
    {
      "title": "Home",
      "url": "http://localhost:3001/",
      "jsonUrl": "http://localhost:3001/home.json"
    },
    {
      "title": "Blog",
      "url": "http://localhost:3001/blog",
      "jsonUrl": "http://localhost:3001/blog.json"
    }
  ],
  "meta": {
    "type": "sitedata"
  }
}

The next endpoint we'll add is an endpoint to return the contents of our Home page. Add the tranformBodyContent method and the new endpoint definition to your element-api.php file:

<?php

use ...

function transformBodyContent(Entry $entry){
    $bodyBlocks = [];
    $blocks = $entry->postContent->all();
    foreach ($blocks as $block) {
        switch ($block->type->handle) {
            case 'text':
                $bodyBlocks[] = [
                    'type' => 'text',
                    'text' => $block->text->getParsedContent(),
                ];
                break;
            case 'image':
                $image = $block->image->one();
                $bodyBlocks[] = [
                    'type' => 'image',
                    'image' => $image ? $image->getUrl() : null,
                ];
                break;
        }
    }
    return $bodyBlocks;
}

return [
    'endpoints' => [
        'site.json' => function() {
            ...
        },
        '<_:home\.json|\.json>'  => function() {
            return[
                'elementType' => 'craft\elements\Entry',
                'criteria' => ['slug' => 'home'],
                'transformer' => function(Entry $entry) {
                    return [
                        'title' => $entry->title,
                        'date_published' => $entry->postDate->format(\DateTime::ATOM),
                        'date_modified' => $entry->dateUpdated->format(\DateTime::ATOM),
                        'content' => transformBodyContent($entry),
                    ];
                },
                'one' => true,
                'meta' => [
                    'type' => 'page'
                ],
            ];
        },
    ]
]

The funny looking endpoint url is just a regex for matching either /home.json or /.json, this will help our front-end in fetching the correct data without having to make an edge-case condition when the web root is requested.

You might also wonder what the transformBodyContent function does. It's a simple helper function to help us parse the body content that is the same field in multiple sections, without having to duplicate a lot of code.

Verify that both http://localhost:3001/.json and http://localhost:3001/home.json work, and send back valid data.

Next, let's create endpoints for both listing blog posts, and fetching the content of a single blog post:

<?php

use ...

function transformBodyContent(Entry $entry){
    ...
}


return [
    'endpoints' => [
        'site.json' => function() {
            ...
        },
        '<_:home\.json|\.json>'  => function() {
            ...
        },
        'blog.json'  => function() {
            return[
                'elementType' => 'craft\elements\Entry',
                'criteria' => [
                    'section' => 'blog',
                    'orderBy' => 'postDate desc',
                ],
                'transformer' => function(Entry $entry) {
                    $featureImage = $entry->featureImage->one();

                    return [
                        'title' => $entry->title,
                        'date_published' => $entry->postDate->format(\DateTime::ATOM),
                        'date_modified' => $entry->dateUpdated->format(\DateTime::ATOM),
                        'url' => $entry->url,
                        'jsonUrl' => UrlHelper::url("blog/{$entry->slug}.json"),
                        'excerpt' => $entry->excerpt,
                        'featureImage' => $featureImage? $featureImage->getUrl() : null,
                    ];
                },
                'elementsPerPage' => 8,
                'meta' => [
                    'type' => 'bloglist'
                ],
            ];
        },
        'blog/<slug:{slug}>.json'  => function($slug) {
            return[
                'elementType' => 'craft\elements\Entry',
                'criteria' => [
                    'section' => 'blog',
                    'slug' => $slug
                ],
                'transformer' => function(Entry $entry) {
                    $featureImage = $entry->featureImage->one();

                    return [
                        'title' => $entry->title,
                        'date_published' => $entry->postDate->format(\DateTime::ATOM),
                        'date_modified' => $entry->dateUpdated->format(\DateTime::ATOM),
                        'content' => transformBodyContent($entry),
                        'excerpt' => $entry->excerpt,
                        'featureImage' => $featureImage? $featureImage->getUrl() : null,
                    ];
                },
                'one' => true,
                'meta' => [
                    'type' => 'blogpost'
                ],
            ];
        },
    ]
];

The /blog.json endpoint should return a list of blog posts, ordered by their post date. The elementsPerPage parameter controls how many results will be sent back. You can fetch older posts with the page query parameter, for example: /blog.json?page=2.

The /blog/<slug>.json endpoint returns a single blog post with the specified slug. The slug is usually the title of the blog post but in lower case and spaces replaced with hyphens. Here we are using the transformBodyContent function again to convert the post content to json.

The final element-api.php should look something like this:

<?php

use craft\elements\Entry;
use craft\elements\GlobalSet;
use craft\helpers\UrlHelper;
use craft\helpers\ArrayHelper;
use craft\models\Section;

function transformBodyContent(Entry $entry){
    $bodyBlocks = [];
    $blocks = $entry->postContent->all();
    foreach ($blocks as $block) {
        switch ($block->type->handle) {
            case 'text':
                $bodyBlocks[] = [
                    'type' => 'text',
                    'text' => $block->text->getParsedContent(),
                ];
                break;
            case 'image':
                $image = $block->image->one();
                $bodyBlocks[] = [
                    'type' => 'image',
                    'image' => $image ? $image->getUrl() : null,
                ];
                break;
        }
    }
    return $bodyBlocks;
}


return [
    'endpoints' => [
        'site.json' => function() {
            return[
                'elementType' => 'craft\elements\GlobalSet',
                'criteria' => ['handle' => 'siteSettings'],
                'transformer' => function(GlobalSet $entry) {
                    $logo = $entry->logo->one();

                    $singleSections = ArrayHelper::where(\Craft::$app->sections->getAllSections(), 
                    'type', Section::TYPE_SINGLE);

                    $pages = Entry::find()
                        ->sectionId(ArrayHelper::getColumn($singleSections, 'id'))
                        ->all();

                    $pageInfos = [];

                    foreach ($pages as $page) {
                        $pageInfos[] = [
                            'title' => $page->title,
                            'url' => $page->url,
                            'jsonUrl' => UrlHelper::url("{$page->slug}.json")
                        ];
                    }

                    $pageInfos[] = [
                        'title' => 'Blog',
                        'url' => UrlHelper::url("blog/"),
                        'jsonUrl' => UrlHelper::url("blog.json")
                    ];

                    return [
                        'logo' => $logo ? $logo->getUrl(['height' => 100]) : null,
                        'footerText' => $entry->footerText,
                        'pages' => $pageInfos
                    ];
                },
                'one' => true,
                'meta' => [
                    'type' => 'sitedata'
                ],
            ];
        },
        '<_:home\.json|\.json>'  => function() {
            return[
                'elementType' => 'craft\elements\Entry',
                'criteria' => ['slug' => 'home'],
                'transformer' => function(Entry $entry) {
                    return [
                        'title' => $entry->title,
                        'date_published' => $entry->postDate->format(\DateTime::ATOM),
                        'date_modified' => $entry->dateUpdated->format(\DateTime::ATOM),
                        'content' => transformBodyContent($entry),
                    ];
                },
                'one' => true,
                'meta' => [
                    'type' => 'page'
                ],
            ];
        },
        'blog.json'  => function() {
            return[
                'elementType' => 'craft\elements\Entry',
                'criteria' => [
                    'section' => 'blog',
                    'orderBy' => 'postDate desc',
                ],
                'transformer' => function(Entry $entry) {
                    $featureImage = $entry->featureImage->one();

                    return [
                        'title' => $entry->title,
                        'date_published' => $entry->postDate->format(\DateTime::ATOM),
                        'date_modified' => $entry->dateUpdated->format(\DateTime::ATOM),
                        'url' => $entry->url,
                        'jsonUrl' => UrlHelper::url("blog/{$entry->slug}.json"),
                        'excerpt' => $entry->excerpt,
                        'featureImage' => $featureImage? $featureImage->getUrl() : null,
                    ];
                },
                'elementsPerPage' => 8,
                'meta' => [
                    'type' => 'bloglist'
                ],
            ];
        },
        'blog/<slug:{slug}>.json'  => function($slug) {
            return[
                'elementType' => 'craft\elements\Entry',
                'criteria' => [
                    'section' => 'blog',
                    'slug' => $slug
                ],
                'transformer' => function(Entry $entry) {
                    $featureImage = $entry->featureImage->one();

                    return [
                        'title' => $entry->title,
                        'date_published' => $entry->postDate->format(\DateTime::ATOM),
                        'date_modified' => $entry->dateUpdated->format(\DateTime::ATOM),
                        'content' => transformBodyContent($entry),
                        'excerpt' => $entry->excerpt,
                        'featureImage' => $featureImage? $featureImage->getUrl() : null,
                    ];
                },
                'one' => true,
                'meta' => [
                    'type' => 'blogpost'
                ],
            ];
        },
    ]
];

Verify that both endpoints work and return valid data.

This part is over, but join me in the next one where we finally build a React front-end for our blog.

Blog

Building a personal blog with Craft CMS, React and Element API / Part 2 - Creating a blog in Craft

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Step 5 - Enabling extensions

Step 6 - Setting up a simple blog in Craft

Step 7 - Setting up Element API

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