m180317_193558_add_home_page.php

<?php

namespace craft\contentmigrations;

use Craft;
use craft\base\Field;
use craft\elements\Entry;
use craft\models\Section;
use craft\models\Section_SiteSettings;
use craft\db\Migration;

/**
 * m180317_193558_add_home_page migration.
 */
class m180317_193558_add_home_page extends Migration
{
    /**
     * @inheritdoc
     */
    public function safeUp()
    {
        // Create a text field
        $fields = Craft::$app->getFields();

        $bodyField = $fields->createField([
            'type' => 'craft\\fields\\PlainText',
            'groupId' => 1,
            'name' => 'Body',
            'handle' => 'body',
        ]);

        echo '    > creating "Body" field ...';
        $fields->saveField($bodyField);
        echo " done\n";

        // Create a homepage section
        $sections = Craft::$app->getSections();
        $siteId = Craft::$app->sites->getPrimarySite()->id;

        $homepageSection = new Section([
            'name' => 'Homepage',
            'handle' => 'homepage',
            'type' => Section::TYPE_SINGLE,
            'siteSettings' => [
                $siteId => new Section_SiteSettings([
                    'siteId' => $siteId,
                    'hasUrls' => true,
                    'uriFormat' => '__home__',
                    'template' => '_homepage',
                ])
            ]
        ]);

        echo '    > creating "Homepage" section ...';
        $sections->saveSection($homepageSection);
        echo " done\n";

        // Set the field layout for the associated entry type
        $homepageEntryType = $sections->getEntryTypesByHandle('homepage')[0];
        $fieldLayout = $fields->assembleLayout([
            'General' => [
                $fields->getFieldByHandle('body')->id,
            ],
        ]);
        $fieldLayout->type = Entry::class;
        $homepageEntryType->setFieldLayout($fieldLayout);

        echo '    > saving "Homepage" entry type ...';
        $sections->saveEntryType($homepageEntryType);
        echo " done\n";

        // Add content to the homepage section
        $elements = Craft::$app->getElements();

        $homepageEntry = Entry::find()->section('homepage')->one();
       $homepageEntry->body = 'This is the body text.';
        // $homepageEntry->setFieldValue('body', 'This is the body text.');

        echo '    > updating "Homepage" entry ...';
        $elements->saveElement($homepageEntry);
        echo " done\n";
    }

    /**
     * @inheritdoc
     */
    public function safeDown()
    {
        echo "m180317_193558_add_home_page cannot be reverted.\n";
        return false;
    }
}