src/helpers/dynamicQueryBuilder.ts

@@ -62,11 +62,17 @@ export default abstract class DynamicQueryBuilder {
     count?: number;
     noLimit?: boolean;
   }): SelectQueryBuilder<ObjectLiteral> {
-    let affix = Math.random().toString(36).substring(2);
+    let affix = queryObj.id;
-    let query = dataSource.getRepository(queryObj.table).createQueryBuilder(`${queryObj.table}_${affix}`);
+    let query = dataSource.getRepository(queryObj.table).createQueryBuilder(`${affix}_${queryObj.table}`);
 
     this.buildDynamicQuery(query, queryObj, affix);
 
+    if (queryObj.orderBy) {
+      queryObj.orderBy.forEach((order) => {
+        query.addOrderBy(`${order.id}_${order.table}.${order.column}`, order.order);
+      });
+    }
+
     if (!noLimit) {
       query.offset(offset);
       query.limit(count);
@@ -78,10 +84,10 @@ export default abstract class DynamicQueryBuilder {
   private static buildDynamicQuery(
     query: SelectQueryBuilder<ObjectLiteral>,
     queryObject: DynamicQueryStructure,
-    affix: string = "",
+    affix: string = "", // table id
     depth: number = 0
   ): void {
-    const alias = queryObject.table + "_" + affix;
+    const alias = `${affix}_${queryObject.table}`;
     let firstSelect = true;
     let selects: Array<string> = [];
 
@@ -108,18 +114,12 @@ export default abstract class DynamicQueryBuilder {
 
     if (queryObject.join) {
       for (const join of queryObject.join) {
-        let subaffix = Math.random().toString(36).substring(2);
+        let subaffix = join.id;
-        query.leftJoin(`${alias}.${join.foreignColumn}`, join.table + "_" + subaffix);
+        query.leftJoin(`${alias}.${join.foreignColumn}`, `${subaffix}_${join.table}`);
 
         this.buildDynamicQuery(query, join, subaffix, depth + 1);
       }
     }
-
-    if (queryObject.orderBy) {
-      queryObject.orderBy.forEach((order) => {
-        query.addOrderBy(`${alias}.${order.column}`, order.order);
-      });
-    }
   }
 
   public static applyWhere(
@@ -391,19 +391,22 @@ export default abstract class DynamicQueryBuilder {
 }
 
 const memberQuery: DynamicQueryStructure = {
+  id: "memberId",
   select: "*",
   table: "member",
   orderBy: [
-    { column: "lastname", order: "ASC" },
+    { id: "memberId", depth: 0, table: "member", column: "lastname", order: "ASC" },
-    { column: "firstname", order: "ASC" },
+    { id: "memberId", depth: 0, table: "member", column: "firstname", order: "ASC" },
   ],
 };
 
 const memberByRunningMembershipQuery: DynamicQueryStructure = {
+  id: "memberId",
   select: "*",
   table: "member",
   join: [
     {
+      id: "membershipId",
       select: "*",
       table: "membership",
       where: [{ structureType: "condition", concat: "_", operation: "null", column: "end", value: "" }],
@@ -411,7 +414,7 @@ const memberByRunningMembershipQuery: DynamicQueryStructure = {
     },
   ],
   orderBy: [
-    { column: "lastname", order: "ASC" },
+    { id: "memberId", depth: 0, table: "member", column: "lastname", order: "ASC" },
-    { column: "firstname", order: "ASC" },
+    { id: "memberId", depth: 0, table: "member", column: "firstname", order: "ASC" },
   ],
 };

src/type/dynamicQueries.ts

@@ -1,9 +1,10 @@
 export interface DynamicQueryStructure {
+  id: string;
   select: string[] | "*";
   table: string;
   where?: Array<ConditionStructure>;
   join?: Array<DynamicQueryStructure & { foreignColumn: string }>;
-  orderBy?: Array<OrderByStructure>;
+  orderBy?: Array<OrderByStructure>; // only at top level
 }
 
 export type ConditionStructure = (
@@ -48,6 +49,9 @@ export type WhereOperation =
 // TODO: age between | age equals | age greater | age smaller
 
 export type OrderByStructure = {
+  id: string;
+  depth: number;
+  table: string;
   column: string;
   order: OrderByType;
 };
@@ -59,6 +63,7 @@ export type QueryResult = {
 };
 
 export const exampleQuery: DynamicQueryStructure = {
+  id: "1234",
   select: ["firstname", "lastname"],
   table: "member",
   where: [
@@ -92,16 +97,19 @@ export const exampleQuery: DynamicQueryStructure = {
   ],
   join: [
     {
+      id: "5678",
       select: "*",
       table: "communication",
       foreignColumn: "sendNewsletter",
     },
     {
+      id: "91011",
       select: "*",
       table: "membership",
       foreignColumn: "memberships",
       join: [
         {
+          id: "121314",
           select: "*",
           table: "membership_status",
           foreignColumn: "status",
@@ -120,10 +128,16 @@ export const exampleQuery: DynamicQueryStructure = {
   ],
   orderBy: [
     {
+      id: "1234",
+      depth: 0,
+      table: "member",
       column: "firstname",
       order: "ASC",
     },
     {
+      id: "1234",
+      depth: 0,
+      table: "member",
       column: "lastname",
       order: "ASC",
     },