Improve label handling in MasterListComponent

The MasterListComponent did only show labels for object lists.
Furthermore the options property in the uischema was mandatory.
Also the property to use as label for objects had to be provided.

The fix now handles primitives, a missing options property and
in the case of a missing `labelRef` the first primitive property
is used. If no primitive property is available the first property in
the schema is used.

Fix #1779

packages/angular-material/src/other/master-detail/master.ts

@@ -35,6 +35,7 @@ import {
   createDefaultValue,
   findUISchema,
   JsonFormsState,
+  JsonSchema,
   mapDispatchToArrayControlProps,
   mapStateToArrayControlProps,
   RankedTester,
@@ -170,7 +171,7 @@ export class MasterListComponent extends JsonFormsArrayControl {
     const controlElement = uischema as ControlElement;
     this.propsPath = props.path;
     const detailUISchema =
-      controlElement.options.detail ||
+      controlElement.options?.detail ||
       findUISchema(
         props.uischemas,
         schema,
@@ -180,11 +181,12 @@ export class MasterListComponent extends JsonFormsArrayControl {
       );
 
     const masterItems = (data || []).map((d: any, index: number) => {
-      const labelRefInstancePath = removeSchemaKeywords(
+      const labelRefInstancePath = controlElement.options?.labelRef && removeSchemaKeywords(
         controlElement.options.labelRef
       );
+      const isPrimitive = d && typeof d !== 'object';
       const masterItem = {
-        label: get(d, labelRefInstancePath),
+        label: isPrimitive ? d.toString() : get(d, labelRefInstancePath ?? getFirstUsableProperty(schema)),
         data: d,
         path: `${path}.${index}`,
         schema,
@@ -247,6 +249,15 @@ export class MasterListComponent extends JsonFormsArrayControl {
   }
 }
 
+const getFirstUsableProperty = (schema: JsonSchema): string => {
+  const prop = Object.entries(schema?.properties).find(e => {
+    if(e[1].type === 'object' || e[1].properties) return false;
+    if(e[1].type === 'array' || e[1].items) return false;
+    return true;
+  });
+  return prop ? prop[0] : Object.keys(schema?.properties)[0];
+}
+
 export const masterDetailTester: RankedTester = rankWith(
   4,
   uiTypeIs('ListWithDetail')

packages/examples/src/1779.ts

@@ -0,0 +1,83 @@
+/*
+  The MIT License
+  
+  Copyright (c) 2017-2021 EclipseSource Munich
+  https://github.com/eclipsesource/jsonforms
+  
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+  
+  The above copyright notice and this permission notice shall be included in
+  all copies or substantial portions of the Software.
+  
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+  THE SOFTWARE.
+*/
+import { registerExamples } from './register';
+
+const data = {
+    'an-array-of-strings': ['foo', 'bar', 'foobar']
+};
+const schema = {
+    type: 'object',
+    properties: {
+        'an-array-of-strings': {
+            type: 'array',
+            items: {
+                type: 'string'
+            }
+        }
+    }
+};
+const uischema = {
+    "type": "ListWithDetail",
+    "scope": "#/properties/an-array-of-strings"
+};
+
+registerExamples([
+    {
+        name: '1779',
+        label: 'List With Detail primitive (string)',
+        data,
+        schema,
+        uischema
+    }
+]);
+
+const data_number = {
+    'an-array-of-numbers': [1, 2, 3]
+};
+const schema_number = {
+    type: 'object',
+    properties: {
+        'an-array-of-numbers': {
+            type: 'array',
+            items: {
+                type: 'number'
+            }
+        }
+    }
+};
+const uischema_number = {
+    "type": "ListWithDetail",
+    "scope": "#/properties/an-array-of-numbers"
+};
+
+registerExamples([
+    {
+        name: '1779',
+        label: 'List With Detail primitive (string)',
+        data: data_number,
+        schema: schema_number,
+        uischema: uischema_number
+    }
+]);

packages/examples/src/index.ts

@@ -74,6 +74,7 @@ import * as booleanToggle from './booleanToggle';
 import * as multiEnum from './multi-enum';
 import * as enumInArray from './enumInArray';
 import * as readonly from './readonly';
+import * as bug_1779 from './1779';
 export * from './register';
 export * from './example';
 
@@ -132,5 +133,6 @@ export {
   booleanToggle,
   multiEnum,
   enumInArray,
-  readonly
+  readonly,
+  bug_1779
 };

packages/examples/src/list-with-detail.ts

@@ -195,6 +195,95 @@ const uischema = {
   }
 };
 
+const uischemaNoLabelRef = {
+  type: 'ListWithDetail',
+  scope: '#/properties/orders',
+  options: {
+    detail: {
+      type: 'VerticalLayout',
+      elements: [
+        {
+          type: 'HorizontalLayout',
+          elements: [
+            {
+              type: 'Control',
+              scope: '#/properties/title'
+            },
+            {
+              type: 'Control',
+              scope: '#/properties/processId'
+            }
+          ]
+        },
+        {
+          type: 'Group',
+          label: 'Customer',
+          elements: [
+            {
+              type: 'Control',
+              label: 'ID',
+              scope: '#/properties/customer/properties/id'
+            },
+            {
+              type: 'Control',
+              label: 'Name',
+              scope: '#/properties/customer/properties/name'
+            },
+            {
+              type: 'Control',
+              label: 'Department',
+              scope: '#/properties/customer/properties/department'
+            }
+          ]
+        },
+        {
+          type: 'VerticalLayout',
+          elements: [
+            {
+              type: 'VerticalLayout',
+              elements: [
+                {
+                  type: 'HorizontalLayout',
+                  elements: [
+                    {
+                      type: 'Control',
+                      scope: '#/properties/ordered',
+                      options: {
+                        toggle: true
+                      }
+                    },
+                    {
+                      type: 'Control',
+                      scope: '#/properties/assignee'
+                    }
+                  ]
+                },
+                {
+                  type: 'HorizontalLayout',
+                  elements: [
+                    {
+                      type: 'Control',
+                      scope: '#/properties/startDate'
+                    },
+                    {
+                      type: 'Control',
+                      scope: '#/properties/endDate'
+                    }
+                  ]
+                },
+                {
+                  type: 'Control',
+                  scope: '#/properties/status'
+                }
+              ]
+            }
+          ]
+        }
+      ]
+    }
+  }
+};
+
 registerExamples([
   {
     name: 'list-with-detail',
@@ -204,3 +293,13 @@ registerExamples([
     uischema
   }
 ]);
+
+registerExamples([
+  {
+    name: 'list-with-detail-no-labelref',
+    label: 'List With Detail (No Label Ref)',
+    data,
+    schema,
+    uischema:uischemaNoLabelRef
+  }
+]);