FIX: ignore and log bad json values for custom fields

spec/components/concern/has_custom_fields_spec.rb

@@ -187,6 +187,47 @@ describe HasCustomFields do
       expect(test_item2.custom_fields).to eq("sixto" => "rodriguez", "de" => "la playa")
     end
 
+    it "supports arrays in json fields" do
+      field_type = "json_array"
+      CustomFieldsTestItem.register_custom_field_type(field_type, :json)
+
+      item = CustomFieldsTestItem.new
+      item.custom_fields = {
+        "json_array" => [{ a: "test" }, { b: "another" }]
+      }
+      item.save
+
+      item.reload
+
+      expect(item.custom_fields[field_type]).to eq(
+        [{ "a" => "test" }, { "b" => "another" }]
+      )
+
+      item.custom_fields["json_array"] = ['a', 'b']
+      item.save
+
+      item.reload
+
+      expect(item.custom_fields[field_type]).to eq(["a", "b"])
+    end
+
+    it "will not fail to load custom fields if json is corrupt" do
+
+      field_type = "bad_json"
+      CustomFieldsTestItem.register_custom_field_type(field_type, :json)
+
+      item = CustomFieldsTestItem.create!
+
+      CustomFieldsTestItemCustomField.create!(
+        custom_fields_test_item_id: item.id,
+        name: field_type,
+        value: "{test"
+      )
+
+      item = item.reload
+      expect(item.custom_fields[field_type]).to eq({})
+    end
+
     it "supports bulk retrieval with a list of ids" do
       item1 = CustomFieldsTestItem.new
       item1.custom_fields = { "a" => ["b", "c", "d"], 'not_whitelisted' => 'secret' }