Fix examples + fix filters schema + proper file validation error message (#107)

* Improve terrain example

* Improve error message upon file validation failure

* Linter

* Fix filters schema

Author: martinRenou

examples/3d_terrain.jGIS

@@ -11,7 +11,7 @@
         "source": "1f457f60-5d31-45f6-8066-4585aabd5629"
       },
       "type": "HillshadeLayer",
-      "visible": false
+      "visible": true
     },
     "a82ef521-e727-4209-a5a0-145d66f18a06": {
       "name": "OpenStreetMap.Mapnik Layer",
@@ -24,10 +24,10 @@
   },
   "options": {
     "bearing": 0.0,
-    "latitude": 47.574246213179435,
-    "longitude": 11.723541623071242,
-    "pitch": 0.0,
-    "zoom": 9.941497348883567
+    "latitude": 47.27340570466396,
+    "longitude": 11.540279388427734,
+    "pitch": 59.00000000000003,
+    "zoom": 11.829283007646955
   },
   "sources": {
     "1f457f60-5d31-45f6-8066-4585aabd5629": {
@@ -60,5 +60,9 @@
       },
       "type": "RasterDemSource"
     }
+  },
+  "terrain": {
+    "exaggeration": 1.0,
+    "source": "1f457f60-5d31-45f6-8066-4585aabd5629"
   }
 }

packages/schema/src/model.ts

@@ -167,7 +167,11 @@ export class JupyterGISModel implements IJupyterGISModel {
     const valid = validate(jsonData);
 
     if (!valid) {
-      throw Error('File format error');
+      let errorMsg = 'File format errors:\n';
+      for (const error of validate.errors || []) {
+        errorMsg = `${errorMsg}- ${error.instancePath} ${error.message}\n`;
+      }
+      throw Error(errorMsg);
     }
 
     this.sharedModel.transact(() => {

packages/schema/src/schema/jgis.json

@@ -188,7 +188,7 @@
       "title": "IJGISFilterItem",
       "type": "object",
       "default": {},
-      "required": ["layerId", "operator", "feature", "value"],
+      "required": ["operator", "feature", "value"],
       "additionalProperties": false,
       "properties": {
         "operator": {