fix(postgres): add custom order direction to subQuery ordering with minified alias (v6)

src/dialects/abstract/query-generator.js

@@ -91,7 +91,7 @@ class QueryGenerator {
   /**
    * Helper method for populating the returning into bind information
    * that is needed by some dialects (currently Oracle)
-   * 
+   *
    * @private
    */
   populateInsertQueryReturnIntoBinds() {
@@ -1352,8 +1352,8 @@ class QueryGenerator {
         } else {
           // Ordering is handled by the subqueries, so ordering the UNION'ed result is not needed
           groupedLimitOrder = options.order;
-          
-          // For the Oracle dialect, the result of a select is a set, not a sequence, and so is the result of UNION.  
+
+          // For the Oracle dialect, the result of a select is a set, not a sequence, and so is the result of UNION.
           // So the top level ORDER BY is required
           if (!this._dialect.supports.topLevelOrderByRequired) {
             delete options.order;
@@ -1612,7 +1612,7 @@ class QueryGenerator {
         } else if (/json_extract\(/.test(attr)) {
           prefix = attr.replace(/json_extract\(/i, `json_extract(${this.quoteIdentifier(includeAs.internalAs)}.`);
         } else if (/json_value\(/.test(attr)) {
-          prefix = attr.replace(/json_value\(/i, `json_value(${this.quoteIdentifier(includeAs.internalAs)}.`); 
+          prefix = attr.replace(/json_value\(/i, `json_value(${this.quoteIdentifier(includeAs.internalAs)}.`);
         } else {
           prefix = `${this.quoteIdentifier(includeAs.internalAs)}.${this.quoteIdentifier(attr)}`;
         }
@@ -2135,7 +2135,21 @@ class QueryGenerator {
           const field = model.rawAttributes[order[0]] ? model.rawAttributes[order[0]].field : order[0];
           const subQueryAlias = this._getAliasForField(this.quoteIdentifier(model.name), field, options);
 
-          subQueryOrder.push(this.quote(subQueryAlias === null ? order : subQueryAlias, model, '->'));
+          let parent = null;
+          let orderToQuote = [];
+
+          // we need to ensure that the parent is null if we use the subquery alias, else we'll get an exception since
+          // "model_name"."alias" doesn't exist - only "alias" does. we also need to ensure that we preserve order direction
+          // by pushing order[1] to the subQueryOrder as well - in case it doesn't exist, we want to push "ASC"
+          if (subQueryAlias === null) {
+            orderToQuote = order;
+            parent = model;
+          } else {
+            orderToQuote = [subQueryAlias, order.length > 1 ? order[1] : 'ASC'];
+            parent = null;
+          }
+
+          subQueryOrder.push(this.quote(orderToQuote, parent, '->'));
         }
 
         // Handle case where renamed attributes are used to order by,

test/integration/dialects/postgres/query.test.js

@@ -124,22 +124,35 @@ if (dialect.match(/^postgres/)) {
       await Foo.create({ name: 'record1' });
       await Foo.create({ name: 'record2' });
 
-      const thisWorks = (await Foo.findAll({
+      const baseTest = (await Foo.findAll({
         subQuery: false,
         order: sequelizeMinifyAliases.literal('"Foo".my_name')
       })).map(f => f.name);
-      expect(thisWorks[0]).to.equal('record1');
+      expect(baseTest[0]).to.equal('record1');
 
-      const thisShouldAlsoWork = (await Foo.findAll({
+      const orderByAscSubquery = (await Foo.findAll({
         attributes: {
           include: [
             [sequelizeMinifyAliases.literal('"Foo".my_name'), 'customAttribute']
           ]
         },
         subQuery: true,
-        order: ['customAttribute']
+        order: [['customAttribute']],
+        limit: 1
       })).map(f => f.name);
-      expect(thisShouldAlsoWork[0]).to.equal('record1');
+      expect(orderByAscSubquery[0]).to.equal('record1');
+
+      const orderByDescSubquery = (await Foo.findAll({
+        attributes: {
+          include: [
+            [sequelizeMinifyAliases.literal('"Foo".my_name'), 'customAttribute']
+          ]
+        },
+        subQuery: true,
+        order: [['customAttribute', 'DESC']],
+        limit: 1
+      })).map(f => f.name);
+      expect(orderByDescSubquery[0]).to.equal('record2');
     });
 
     it('returns the minified aliased attributes', async () => {