Let nested include query returns results when quoteIdentifiers is false on Postgres (#6375)

* Keep the key sequence when translate the lower case key name to camelcase name of each row
* Use arrow functions to minimize or eliminate self
* Use arrow functions to minimize or eliminate self in test
* Refine the format of 'else'

changelog.md

@@ -35,6 +35,7 @@
 - [FIXED] Generate correct SQL of nested include when quoteIdentifiers is false. (Postgres) [#6351](https://github.com/sequelize/sequelize/issues/6351)
 - [FIXED] Generate correct SQL for JSON attributes with quote.
 [#6406](https://github.com/sequelize/sequelize/issues/6406)
+- [FIXED] Nested query return correct result when quoteIdentifiers is false. (Postgres) [#6363](https://github.com/sequelize/sequelize/issues/6363)
 
 ## BC breaks:
 - Range type bounds now default to [postgres default](https://www.postgresql.org/docs/9.5/static/rangetypes.html#RANGETYPES-CONSTRUCT) `[)` (inclusive, exclusive), previously was `()` (exclusive, exclusive)

lib/dialects/postgres/query.js

@@ -194,17 +194,17 @@ class Query extends AbstractQuery {
             m[k.toLowerCase()] = k;
             return m;
           }, {});
-          for (const row of rows) {
-            for (const key of Object.keys(row)) {
+          rows = _.map(rows,(row)=> {
+            return _.mapKeys(row, (value, key)=> {
               const targetAttr = attrsMap[key];
               if (typeof targetAttr === 'string' && targetAttr !== key) {
-                row[targetAttr] = row[key];
-                delete row[key];
-              }
-            }
+                return targetAttr;
+              } else {
+                return key;
               }
+            });
+          });
         }
-
         return this.handleSelectQuery(rows);
       } else if (QueryTypes.DESCRIBE === this.options.type) {
         result = {};

test/integration/dialects/postgres/dao.test.js

@@ -5,6 +5,8 @@
 var chai = require('chai')
   , expect = chai.expect
   , Support = require(__dirname + '/../../support')
+  , Sequelize = Support.Sequelize
+  , Promise   = Sequelize.Promise
   , dialect = Support.getTestDialect()
   , DataTypes = require(__dirname + '/../../../../lib/data-types')
   , sequelize = require(__dirname + '/../../../../lib/sequelize');
@@ -957,6 +959,143 @@ if (dialect.match(/^postgres/)) {
             });
         });
       });
+      it('can select nested include', function() {
+        this.sequelize.options.quoteIdentifiers = false;
+        this.sequelize.getQueryInterface().QueryGenerator.options.quoteIdentifiers = false;
+        this.Professor  = this.sequelize.define('Professor', {
+          fullName: DataTypes.STRING
+        }, {
+          quoteIdentifiers: false
+        });
+        this.Class = this.sequelize.define('Class', {
+          name: DataTypes.STRING
+        }, {
+          quoteIdentifiers: false
+        });
+        this.Student = this.sequelize.define('Student', {
+          fullName: DataTypes.STRING
+        }, {
+          quoteIdentifiers: false
+        });
+        this.ClassStudent = this.sequelize.define('ClassStudent', {
+        }, {
+          quoteIdentifiers: false,
+	        tableName: 'class_student'
+        });
+        this.Professor.hasMany(this.Class);
+        this.Class.belongsTo(this.Professor);
+        this.Class.belongsToMany(this.Student,{through: this.ClassStudent});
+        this.Student.belongsToMany(this.Class,{through: this.ClassStudent});
+        return this.Professor.sync({ force: true })
+          .then(()=> {
+            return this.Student.sync({ force: true });
+          })
+          .then(()=> {
+            return this.Class.sync({ force: true });
+          })
+          .then(()=> {
+            return this.ClassStudent.sync({ force: true });
+          })
+          .then(()=> {
+              return this.Professor.bulkCreate([
+                {
+                  id: 1,
+                  fullName: 'Albus Dumbledore'
+                },
+                {
+                  id: 2,
+                  fullName: 'Severus Snape'
+                }
+              ]);
+            })
+          .then(()=> {
+            return this.Class.bulkCreate([
+              {
+                id: 1,
+                name: 'Transfiguration',
+                ProfessorId: 1
+              },
+              {
+                id: 2,
+                name: 'Potions',
+                ProfessorId: 2
+              },
+              {
+                id: 3,
+                name: 'Defence Against the Dark Arts',
+                ProfessorId: 2
+              }
+            ]);
+          })
+          .then(()=> {
+            return this.Student.bulkCreate([
+              {
+                id: 1,
+                fullName: 'Harry Potter',
+              },
+              {
+                id: 2,
+                fullName: 'Ron Weasley',
+              },
+              {
+                id: 3,
+                fullName: 'Ginny Weasley',
+              },
+              {
+                id: 4,
+                fullName: 'Hermione Granger',
+              }
+            ]);
+          })
+          .then(()=> {
+            return Promise.all([
+              this.Student.findById(1)
+                .then((Harry)=> {
+                  return Harry.setClasses([1,2,3]);
+                }),
+              this.Student.findById(2)
+                .then((Ron)=> {
+                  return Ron.setClasses([1,2]);
+                }),
+              this.Student.findById(3)
+                .then((Ginny)=> {
+                  return Ginny.setClasses([2,3]);
+                }),
+              this.Student.findById(4)
+                .then((Hermione)=> {
+                  return Hermione.setClasses([1,2,3]);
+                })
+            ]);
+          })
+          .then(()=> {
+            return this.Professor.findAll({
+              include:[
+                {
+                  model: this.Class,
+                  include: [
+                    {
+                      model: this.Student
+                    }
+                  ]
+                }
+              ],
+              order: [
+                ['id'],
+                [this.Class, 'id'],
+                [this.Class, this.Student, 'id']
+              ]
+            });
+          })
+          .then((professors)=> {
+            expect(professors.length).to.eql(2);
+            expect(professors[0].fullName).to.eql('Albus Dumbledore');
+            expect(professors[0].Classes.length).to.eql(1);
+            expect(professors[0].Classes[0].Students.length).to.eql(3);
+          })
+          .finally(()=> {
+            this.sequelize.getQueryInterface().QueryGenerator.options.quoteIdentifiers = true;
+          });
+      });
     });
   });
 }