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CMS Mastering Development

Saving custom element types

i have created my first plugin and have hit a bit of a wall… its a plugin with a custom element type, i have it creating its own database table (migrations/install.php) and i have the form displaying, and the bit i am struggling with is the saving bit. I build a new element type based on the form details, then do a Craft::$app->getElements()->saveElement($song); ($song is my element type) , i keep getting a getSection method missing error from my Song element type, but i dont have a sectionId, or need a section for this as it is stored entirely in its own table, what have i not understood about creating and saving a custom element type?

Is there a demo plugin or some example i can learn from?

This is my controller

new SongElementType();
$SongElementType->name = Craft::$app->request->getParam('name', $SongElementType->name);
$SongElementType->band = Craft::$app->request->getParam('band', $SongElementType->band);

then i call save that is in my service from my controller like so:

songscatalogue::getInstance()->SongsService->saveSong($SongElementType)
            $this->trigger(self::EVENT_SONG_SAVED_BEFORE, new SongEvent([
                'song' => $song,
                'isNew' => $isNew,
            ]));

            $success = Craft::$app->getElements()->saveElement($song);

            $this->trigger(self::EVENT_SONG_SAVED_AFTER, new SongEvent([
                'song' => $song,
                'isNew' => $isNew,
            ]));

but i get this error:

Calling unknown method: robsplugin\songscatalogue\elements\Song::getSection()

where am i going wrong?

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