fixes #120

lib/classes/JsonApi/Schemas/Courseware/Block.php

@@ -37,7 +37,7 @@ class Block extends SchemaProvider
     {
         return [
             'position' => (int) $resource['position'],
-            'block-type' => (string) $resource['block_type'],
+            'block-type' => (string) $resource->getBlockType(),
             'title' => (string) $resource->type->getTitle(),
             'visible' => (bool) $resource['visible'],
             'payload' => $resource->type->getPayload(),

lib/models/Courseware/Block.php

@@ -191,4 +191,16 @@ class Block extends \SimpleORMap
 
         return $block;
     }
+
+    public function getBlockType(): ?string
+    {
+        if ($this->type->findBlockType($this->block_type)) {
+            return $this->block_type;
+        } else {
+            $this->payload = json_encode(array(
+                'original_block_type' => $this->block_type
+            ));
+            return 'error';
+        }
+    }
 }

lib/models/Courseware/BlockTypes/BlockType.php

@@ -160,7 +160,8 @@ abstract class BlockType
     {
         if (!($class = self::findBlockType($block['block_type']))) {
             // TODO: Hier müsste es eine weniger allgemeine Exception geben.
-            throw new \RuntimeException('Invalid `block_type` attribute in database.');
+            // throw new \RuntimeException('Invalid `block_type` attribute in database.');
+            return new \Courseware\BlockTypes\Error($block);
         }
 
         return new $class($block);

lib/models/Courseware/BlockTypes/Error.json

+{
+    "title": "Payload schema of Courseware\\BlockType\\Error",
+    "type": "object",
+    "properties": {},
+    "required": [],
+    "additionalProperties": false
+}
+

lib/models/Courseware/BlockTypes/Error.php

+<?php
+
+namespace Courseware\BlockTypes;
+
+use Opis\JsonSchema\Schema;
+
+/**
+ * This class represents the content of a Courseware error block.
+ *
+ * @author  Ron Lucke <lucke@elan-ev.de>
+ * @license GPL2 or any later version
+ *
+ * @since   Stud.IP 5.0
+ */
+class Error extends BlockType
+{
+    public static function getType(): string
+    {
+        return 'error';
+    }
+
+    public static function getTitle(): string
+    {
+        return _('Fehler');
+    }
+
+    public static function getDescription(): string
+    {
+        return _('Zeigt eine Fehlemeldung an.');
+    }
+
+    public function initialPayload(): array
+    {
+        return [];
+    }
+
+    public static function getJsonSchema(): Schema
+    {
+        $schemaFile = __DIR__.'/Error.json';
+
+        return Schema::fromJsonString(file_get_contents($schemaFile));
+    }
+
+    public static function getCategories(): array
+    {
+        return [];
+    }
+
+    public static function getContentTypes(): array
+    {
+        return [];
+    }
+
+    public static function getFileTypes(): array
+    {
+        return [];
+    }
+}

resources/vue/components/courseware/CoursewareBlockActions.vue

@@ -23,6 +23,10 @@ export default {
     },
     props: {
         canEdit: Boolean,
+        deleteOnly: {
+            type: Boolean,
+            default: false
+        },
         block: Object,
     },
     data() {
@@ -44,7 +48,11 @@ export default {
         },
     },
     mounted() {
+        if (this.deleteOnly) {
+            this.menuItems = [];
+        }
         if (this.canEdit) {
+            if (!this.deleteOnly) {
                 this.menuItems.push({ id: 1, label: this.$gettext('Block bearbeiten'), icon: 'edit', emit: 'editBlock' });
                 this.menuItems.push({
                     id: 2,
@@ -66,6 +74,7 @@ export default {
                     icon: 'info',
                     emit: 'showInfo',
                 });
+            }
             this.menuItems.push({
                 id: 9,
                 label: this.$gettext('Block löschen'), 

resources/vue/components/courseware/CoursewareCompanionBox.vue

 <template>
     <div class="cw-companion-box" :class="[mood]">
         <div>
-            <p>{{ msgCompanion }}</p>
+            <p v-html="msgCompanion"></p>
             <slot name="companionActions"></slot>
         </div>
     </div>

resources/vue/components/courseware/CoursewareDefaultBlock.vue

@@ -12,6 +12,7 @@
                 <courseware-block-actions
                     :block="block"
                     :canEdit="canEdit"
+                    :deleteOnly="deleteOnly"
                     @editBlock="displayFeature('Edit')"
                     @showFeedback="displayFeature('Feedback')"
                     @showComments="displayFeature('Comments')"
@@ -101,9 +102,14 @@ export default {
     props: {
         block: Object,
         canEdit: Boolean,
+        deleteOnly: {
+            type: Boolean,
+            default: false
+        },
         isTeacher: Boolean,
         preview: Boolean,
         defaultGrade: {
+            type: Boolean,
             default: true,
         },
     },
@@ -152,7 +158,7 @@ export default {
         blockTitle() {
             const type = this.block.attributes['block-type'];
 
-            return this.blockTypes.find((blockType) => blockType.type === type)?.title || '';
+            return this.blockTypes.find((blockType) => blockType.type === type)?.title || this.$gettext('Fehler');
         },
     },
     mounted() {

resources/vue/components/courseware/CoursewareErrorBlock.vue

+<template>
+    <div class="cw-block cw-block-error">
+        <courseware-default-block
+            :block="block"
+            :canEdit="canEdit"
+            :deleteOnly="true"
+            :isTeacher="isTeacher"
+            :preview="false"
+            :defaultGrade="false"
+        >
+            <template #content>
+                <div class="cw-block-error-content">
+                    <courseware-companion-box 
+                        mood="sad"
+                        :msgCompanion="errorMessage"
+                    >
+                    </courseware-companion-box>
+                </div>
+            </template>
+        </courseware-default-block>
+    </div>
+</template>
+
+<script>
+import CoursewareDefaultBlock from './CoursewareDefaultBlock.vue';
+import { blockMixin } from './block-mixin.js';
+import CoursewareCompanionBox from './CoursewareCompanionBox.vue';
+
+export default {
+    name: 'courseware-error-block',
+    mixins: [blockMixin],
+    components: {
+        CoursewareDefaultBlock,
+        CoursewareCompanionBox,
+    },
+    props: {
+        block: Object,
+        canEdit: Boolean,
+        isTeacher: Boolean,
+    },
+    computed: {
+        originalBlockType() {
+            return this.block?.attributes?.payload?.original_block_type;
+        },
+        errorMessage() {
+            let message = '<b>'
+            message += this.$gettext('Es ist ein Fehler aufgetretten! Der Block-Typ dieses Blocks ist nicht verfügbar.');
+            message += '</b><br>'
+            message += 'block_type: ' + this.originalBlockType + ' not found';
+
+            return message;
+        }
+    },
+
+};
+</script>

resources/vue/components/courseware/container-components.js

@@ -13,6 +13,7 @@ import CoursewareDialogCardsBlock from './CoursewareDialogCardsBlock.vue';
 import CoursewareDocumentBlock from './CoursewareDocumentBlock.vue';
 import CoursewareDownloadBlock from './CoursewareDownloadBlock.vue';
 import CoursewareEmbedBlock from './CoursewareEmbedBlock.vue';
+import CoursewareErrorBlock from './CoursewareErrorBlock.vue';
 import CoursewareFolderBlock from './CoursewareFolderBlock.vue';
 import CoursewareGalleryBlock from './CoursewareGalleryBlock.vue';
 import CoursewareHeadlineBlock from './CoursewareHeadlineBlock.vue';
@@ -41,6 +42,7 @@ const ContainerComponents = {
     CoursewareDocumentBlock,
     CoursewareDownloadBlock,
     CoursewareEmbedBlock,
+    CoursewareErrorBlock,
     CoursewareFolderBlock,
     CoursewareGalleryBlock,
     CoursewareHeadlineBlock,