Server responds with 500 when filter contains empty conditions array #87

(cherry picked from commit 374d307)

Author: NikitaShchienko

modules/rest-api/src/com/haulmont/addon/restapi/api/service/EntitiesControllerManager.java

@@ -191,10 +191,15 @@ public EntitiesSearchResult searchEntities(String entityName,
             throw new RestAPIException("Cannot parse entities filter", e.getMessage(), HttpStatus.BAD_REQUEST, e);
         }
 
-        String jpqlWhere = filterParseResult.getJpqlWhere().replace("{E}", "e");
+        String jpqlWhere = filterParseResult.getJpqlWhere();
         Map<String, Object> queryParameters = filterParseResult.getQueryParameters();
 
-        String queryString = "select e from " + entityName + " e where " + jpqlWhere;
+        String queryString = "select e from " + entityName + " e";
+
+        if (jpqlWhere != null) {
+            queryString += " where " + jpqlWhere.replace("{E}", "e");
+        }
+
         String json = _loadEntitiesList(queryString, viewName, limit, offset, sort, returnNulls,
                 dynamicAttributes, modelVersion, metaClass, queryParameters);
         Long count = null;
@@ -225,11 +230,18 @@ public Long countSearchEntities(String entityName,
             throw new RestAPIException("Cannot parse entities filter", e.getMessage(), HttpStatus.BAD_REQUEST, e);
         }
 
-        String jpqlWhere = filterParseResult.getJpqlWhere().replace("{E}", "e");
+        String jpqlWhere = filterParseResult.getJpqlWhere();
         Map<String, Object> queryParameters = filterParseResult.getQueryParameters();
 
-        String queryString = "select count(e) from " + entityName + " e where " + jpqlWhere;
-        return dataManager.loadValue(queryString, Long.class).setParameters(queryParameters).one();
+        String queryString = "select count(e) from " + entityName + " e";
+
+        if (jpqlWhere != null) {
+            queryString += " where " + jpqlWhere.replace("{E}", "e");
+        }
+
+        return dataManager.loadValue(queryString, Long.class)
+                .setParameters(queryParameters)
+                .one();
     }
 
     public EntitiesSearchResult searchEntities(String entityName, String searchRequestBody) {

modules/rest-api/src/com/haulmont/addon/restapi/api/service/filter/RestFilterParser.java

@@ -88,19 +88,23 @@ public RestFilterParseResult parse(String filterJson, MetaClass metaClass) throw
         rootCondition.setType(RestFilterGroupCondition.Type.AND);
 
         JsonObject filterObject = new JsonParser().parse(filterJson).getAsJsonObject();
-        JsonArray conditions = filterObject.get("conditions").getAsJsonArray();
-        if (conditions != null) {
-            for (JsonElement conditionElement : conditions) {
-                JsonObject conditionObject = conditionElement.getAsJsonObject();
-                RestFilterCondition restFilterCondition = parseConditionObject(conditionObject, metaClass);
-                rootCondition.getConditions().add(restFilterCondition);
+        JsonElement conditions = filterObject.get("conditions");
+        if (conditions != null && conditions.isJsonArray()) {
+            JsonArray conditionsJsonArray = conditions.getAsJsonArray();
+            if (conditionsJsonArray.size() != 0) {
+                for (JsonElement conditionElement : conditionsJsonArray) {
+                    JsonObject conditionObject = conditionElement.getAsJsonObject();
+                    RestFilterCondition restFilterCondition = parseConditionObject(conditionObject, metaClass);
+                    rootCondition.getConditions().add(restFilterCondition);
+                }
+                Map<String, Object> queryParameters = new HashMap<>();
+                collectQueryParameters(rootCondition, queryParameters);
+
+                return new RestFilterParseResult(rootCondition.toJpql(), queryParameters);
             }
         }
 
-        Map<String, Object> queryParameters = new HashMap<>();
-        collectQueryParameters(rootCondition, queryParameters);
-
-        return new RestFilterParseResult(rootCondition.toJpql(), queryParameters);
+        return new RestFilterParseResult(null, null);
     }
 
     protected void collectQueryParameters(RestFilterCondition condition, Map<String, Object> queryParameters) {