deduplicate code

Author: r1tsuu

packages/db-mongodb/src/utilities/buildVirtualFieldsAggregation.ts

@@ -37,10 +37,13 @@ export const buildVirtualFieldsAggregation = ({
     }
 
     if ('virtual' in field && field.virtual && typeof field.virtual === 'object') {
+      const relationshipPath = versions
+        ? `version.${field.virtual.relationship}`
+        : field.virtual.relationship
       const currentPath = `${prefix}${field.name}`
       const relationshipField = getFieldByPath({
         fields: rootFields,
-        path: versions ? `version.${field.virtual.relationship}` : field.virtual.relationship,
+        path: relationshipPath,
       })
 
       if (!relationshipField) {
@@ -81,9 +84,7 @@ export const buildVirtualFieldsAggregation = ({
             as: currentPath,
             foreignField: '_id',
             from: RelationshipModel.collection.name,
-            localField: versions
-              ? `version.${field.virtual.relationship}`
-              : field.virtual.relationship,
+            localField: relationshipPath,
             pipeline: [
               {
                 $project: {