updated metric default value to double and added logic to handle relations when direction to

application/src/main/java/org/thingsboard/server/actors/calculatedField/CalculatedFieldManagerMessageProcessor.java

@@ -595,22 +595,12 @@ public class CalculatedFieldManagerMessageProcessor extends AbstractContextAware
             Predicate<EntityId> matchesCfEntity = relatedEntity -> cfEntityId.equals(relatedEntity) || cfEntityId.equals(getProfileId(tenantId, relatedEntity));
             if (byRelationPathQuery != null && !byRelationPathQuery.isEmpty()) {
                 switch (relation.direction()) {
-                    case FROM -> {
-                        if (byRelationPathQuery.size() > 1) {
-                            throw new IllegalStateException("More than one relation found with direction 'TO' " +
-                                    "for relation type '" + relation.relationType() + "'. Found: " + byRelationPathQuery.size());
-                        }
-                        EntityRelation entityRelation = byRelationPathQuery.get(0); // only one supported
-                        EntityId relatedId = entityRelation.getFrom();
-                        if (matchesCfEntity.test(relatedId)) {
-                            result.add(new CalculatedFieldEntityCtxId(tenantId, cf.getCfId(), relatedId));
-                        }
-                    }
-                    case TO -> {
-                        byRelationPathQuery.stream()
-                                .filter(entityRelation -> matchesCfEntity.test(entityRelation.getTo()))
-                                .forEach(entityRelation -> result.add(new CalculatedFieldEntityCtxId(tenantId, cf.getCfId(), entityRelation.getTo())));
-                    }
+                    case FROM -> byRelationPathQuery.stream()
+                            .filter(entityRelation -> matchesCfEntity.test(entityRelation.getFrom()))
+                            .forEach(entityRelation -> result.add(new CalculatedFieldEntityCtxId(tenantId, cf.getCfId(), entityRelation.getFrom())));
+                    case TO -> byRelationPathQuery.stream()
+                            .filter(entityRelation -> matchesCfEntity.test(entityRelation.getTo()))
+                            .forEach(entityRelation -> result.add(new CalculatedFieldEntityCtxId(tenantId, cf.getCfId(), entityRelation.getTo())));
                 }
             }
         }

application/src/main/java/org/thingsboard/server/service/cf/AbstractCalculatedFieldProcessingService.java

@@ -247,20 +247,8 @@ public abstract class AbstractCalculatedFieldProcessingService {
             }
 
             return switch (relation.direction()) {
-                case FROM -> relations.stream()
-                        .map(EntityRelation::getTo)
-                        .toList();
-                case TO -> {
-                    if (relations.size() > 1) {
-                        throw new IllegalStateException("More than one relation found with direction 'TO' " +
-                                        "for relation type '" + relation.relationType() + "'. Found: " + relations.size());
-                    }
-                    yield relations.stream()
-                        .map(EntityRelation::getFrom)
-                        .findFirst()
-                        .map(List::of)
-                        .orElseGet(Collections::emptyList);
-                }
+                case FROM -> relations.stream().map(EntityRelation::getTo).toList();
+                case TO -> relations.stream().map(EntityRelation::getFrom).toList();
             };
         }, calculatedFieldCallbackExecutor);
     }

application/src/main/java/org/thingsboard/server/service/cf/ctx/state/aggregation/RelatedEntitiesAggregationCalculatedFieldState.java

@@ -33,6 +33,7 @@ import org.thingsboard.server.common.data.cf.configuration.aggregation.AggKeyInp
 import org.thingsboard.server.common.data.cf.configuration.aggregation.AggMetric;
 import org.thingsboard.server.common.data.cf.configuration.aggregation.RelatedEntitiesAggregationCalculatedFieldConfiguration;
 import org.thingsboard.server.common.data.id.EntityId;
+import org.thingsboard.server.common.data.relation.EntitySearchDirection;
 import org.thingsboard.server.dao.entity.EntityService;
 import org.thingsboard.server.service.cf.CalculatedFieldResult;
 import org.thingsboard.server.service.cf.TelemetryCalculatedFieldResult;
@@ -300,8 +301,25 @@ public class RelatedEntitiesAggregationCalculatedFieldState extends BaseCalculat
             if (argumentEntry == null || argumentEntry.isEmpty()) {
                 return ReadinessStatus.notReady(MISSING_AGGREGATION_ENTITIES_ERROR);
             }
+            if (argumentEntry instanceof RelatedEntitiesArgumentEntry relatedEntitiesArgumentEntry) {
+                try {
+                    checkConstraintByDirection(relatedEntitiesArgumentEntry);
+                } catch (Exception e) {
+                    return ReadinessStatus.notReady(e.getMessage());
+                }
+            }
         }
         return ReadinessStatus.READY;
     }
 
+    public void checkConstraintByDirection(RelatedEntitiesArgumentEntry relatedEntitiesArgumentEntry) {
+        if (ctx.getCalculatedField().getConfiguration() instanceof RelatedEntitiesAggregationCalculatedFieldConfiguration config) {
+            if (EntitySearchDirection.TO == config.getRelation().direction()) {
+                if (relatedEntitiesArgumentEntry.getEntityInputs().size() > 1) {
+                    throw new IllegalArgumentException("More than one related entity is not supported for relation direction 'TO'. Found: " + relatedEntitiesArgumentEntry.getEntityInputs().size() + ".");
+                }
+            }
+        }
+    }
+
 }

application/src/main/java/org/thingsboard/server/service/cf/ctx/state/aggregation/RelatedEntitiesArgumentEntry.java

@@ -66,29 +66,28 @@ public class RelatedEntitiesArgumentEntry implements ArgumentEntry, HasLatestTs
     @Override
     public boolean updateEntry(ArgumentEntry entry, CalculatedFieldCtx ctx) {
         if (entry instanceof RelatedEntitiesArgumentEntry relatedEntitiesArgumentEntry) {
-            checkMaxRelatedEntitiesPerArgument(ctx);
+            checkRelatedEntitiesNumber(ctx);
             entityInputs.putAll(relatedEntitiesArgumentEntry.entityInputs);
-            return true;
         } else if (entry instanceof SingleValueArgumentEntry singleValueArgumentEntry) {
             if (entry.isForceResetPrevious()) {
-                checkMaxRelatedEntitiesPerArgument(ctx);
+                checkRelatedEntitiesNumber(ctx);
                 entityInputs.put(singleValueArgumentEntry.getEntityId(), singleValueArgumentEntry);
-                return true;
-            }
-            ArgumentEntry argumentEntry = entityInputs.get(singleValueArgumentEntry.getEntityId());
-            if (argumentEntry != null) {
-                argumentEntry.updateEntry(singleValueArgumentEntry, ctx);
             } else {
-                checkMaxRelatedEntitiesPerArgument(ctx);
-                entityInputs.put(singleValueArgumentEntry.getEntityId(), singleValueArgumentEntry);
+                ArgumentEntry argumentEntry = entityInputs.get(singleValueArgumentEntry.getEntityId());
+                if (argumentEntry != null) {
+                    argumentEntry.updateEntry(singleValueArgumentEntry, ctx);
+                } else {
+                    checkRelatedEntitiesNumber(ctx);
+                    entityInputs.put(singleValueArgumentEntry.getEntityId(), singleValueArgumentEntry);
+                }
             }
-            return true;
         } else {
             throw new IllegalArgumentException("Unsupported argument entry type for aggregation argument entry: " + entry.getType());
         }
+        return true;
     }
 
-    private void checkMaxRelatedEntitiesPerArgument(CalculatedFieldCtx ctx) {
+    private void checkRelatedEntitiesNumber(CalculatedFieldCtx ctx) {
         if (entityInputs.size() >= ctx.getMaxRelatedEntitiesPerCfArgument()) {
             throw new IllegalArgumentException(
                     "Exceeded the maximum allowed related entities per argument '"

application/src/main/java/org/thingsboard/server/utils/CalculatedFieldArgumentUtils.java

@@ -68,9 +68,9 @@ public class CalculatedFieldArgumentUtils {
     }
 
     public static ArgumentEntry createDefaultMetricArgumentEntry(String argKey, AggMetric metric) {
-        Long defaultValue = metric.getDefaultValue();
+        Double defaultValue = metric.getDefaultValue();
         if (defaultValue != null) {
-            return ArgumentEntry.createSingleValueArgument(new DoubleDataEntry(argKey, defaultValue.doubleValue()));
+            return ArgumentEntry.createSingleValueArgument(new DoubleDataEntry(argKey, defaultValue));
         }
         return new SingleValueArgumentEntry();
     }

application/src/test/java/org/thingsboard/server/cf/EntityAggregationCalculatedFieldTest.java

@@ -254,7 +254,7 @@ public class EntityAggregationCalculatedFieldTest extends AbstractControllerTest
         AggMetric consumption = new AggMetric();
         consumption.setFunction(AggFunction.SUM);
         consumption.setInput(new AggKeyInput("en"));
-        consumption.setDefaultValue(9999L);
+        consumption.setDefaultValue(9999.0);
         aggMetrics.put("consumption", consumption);
 
         AggMetric avgEnergyConsumption = new AggMetric();
@@ -319,7 +319,7 @@ public class EntityAggregationCalculatedFieldTest extends AbstractControllerTest
         AggMetric consumption = new AggMetric();
         consumption.setFunction(AggFunction.SUM);
         consumption.setInput(new AggKeyInput("en"));
-        consumption.setDefaultValue(9999L);
+        consumption.setDefaultValue(9999.0);
         aggMetrics.put("consumption", consumption);
 
         AggMetric avgTemperature = new AggMetric();

application/src/test/java/org/thingsboard/server/controller/CalculatedFieldControllerTest.java

@@ -382,7 +382,7 @@ public class CalculatedFieldControllerTest extends AbstractControllerTest {
 
         AggMetric metric = new AggMetric();
         metric.setInput(new AggKeyInput("en"));
-        metric.setDefaultValue(9999L);
+        metric.setDefaultValue(9999.0);
         config.setMetrics(Map.of("consumption", metric));
 
         config.setWatermark(new Watermark(TimeUnit.DAYS.toSeconds(1)));

common/data/src/main/java/org/thingsboard/server/common/data/cf/configuration/aggregation/AggMetric.java

@@ -27,6 +27,6 @@ public class AggMetric {
     private AggFunction function;
     private String filter;
     private AggInput input;
-    private Long defaultValue;
+    private Double defaultValue;
 
 }

dao/src/main/java/org/thingsboard/server/dao/relation/BaseRelationService.java

@@ -52,11 +52,11 @@ import org.thingsboard.server.common.data.rule.RuleChainType;
 import org.thingsboard.server.common.data.tenant.profile.DefaultTenantProfileConfiguration;
 import org.thingsboard.server.dao.entity.EntityService;
 import org.thingsboard.server.dao.eventsourcing.RelationActionEvent;
-import org.thingsboard.server.exception.DataValidationException;
 import org.thingsboard.server.dao.service.ConstraintValidator;
 import org.thingsboard.server.dao.sql.JpaExecutorService;
 import org.thingsboard.server.dao.sql.relation.JpaRelationQueryExecutorService;
 import org.thingsboard.server.dao.usagerecord.ApiLimitService;
+import org.thingsboard.server.exception.DataValidationException;
 
 import java.util.ArrayList;
 import java.util.Collections;
@@ -547,7 +547,9 @@ class BaseRelationService implements RelationService {
                 case FROM -> findByFromAndType(tenantId, relationPathQuery.rootEntityId(), relationPathLevel.relationType(), RelationTypeGroup.COMMON);
                 case TO -> findByToAndType(tenantId, relationPathQuery.rootEntityId(), relationPathLevel.relationType(), RelationTypeGroup.COMMON);
             };
-            return relations.size() > limit ? relations.subList(0, limit) : relations;
+            ArrayList<EntityRelation> entityRelations = new ArrayList<>(relations);
+            entityRelations.sort(Comparator.comparing(r -> r.getFrom().getId()));
+            return entityRelations.size() > limit ? entityRelations.subList(0, limit) : entityRelations;
         }
         return relationDao.findByRelationPathQuery(tenantId, relationPathQuery, limit);
     }