Fix "describeTable returns a wrong value for primaryKey" #5756 (#6966)

* issue #5756 correct PKs with describeTable

* #5756 FIXED

* #5756 FIXED describeTable

* #5736 fixed

* #5736 test & fixes (describeTable PK)

* #5756  hash and link

changelog.md

 # Future
+- [FIXED] describeTable returns a wrong value for primaryKey [#5756] (https://github.com/sequelize/sequelize/issues/5756)
 - [FIXED] MSSQL LIMIT IN UPDATE [#6636](https://github.com/sequelize/sequelize/issues/6636)
 - [FIXED] Custom error message not used for `notNull` validation [#6531](https://github.com/sequelize/sequelize/issues/6531)
 - [FIXED] N:M `through` option naming collisions [#4597](https://github.com/sequelize/sequelize/issues/4597)

lib/dialects/mssql/query-generator.js

@@ -118,15 +118,21 @@ var QueryGenerator = {
       "c.CHARACTER_MAXIMUM_LENGTH AS 'Length',",
       "c.IS_NULLABLE as 'IsNull',",
       "COLUMN_DEFAULT AS 'Default',",
-      "tc.CONSTRAINT_TYPE AS 'Constraint'",
+      "pk.CONSTRAINT_TYPE AS 'Constraint'",
       'FROM',
       'INFORMATION_SCHEMA.TABLES t',
       'INNER JOIN',
       'INFORMATION_SCHEMA.COLUMNS c ON t.TABLE_NAME = c.TABLE_NAME AND t.TABLE_SCHEMA = c.TABLE_SCHEMA',
-      'LEFT JOIN',
-      'INFORMATION_SCHEMA.KEY_COLUMN_USAGE cu ON t.TABLE_NAME = cu.TABLE_NAME AND cu.COLUMN_NAME = c.COLUMN_NAME AND t.TABLE_SCHEMA = cu.TABLE_SCHEMA',
-      'LEFT JOIN',
-      'INFORMATION_SCHEMA.TABLE_CONSTRAINTS tc ON t.TABLE_NAME = tc.TABLE_NAME AND cu.COLUMN_NAME = c.COLUMN_NAME AND tc.CONSTRAINT_TYPE = \'PRIMARY KEY\'',
+      'LEFT JOIN (SELECT tc.table_schema, tc.table_name, ', 
+            'cu.column_name, tc.constraint_type ',
+            'FROM information_schema.TABLE_CONSTRAINTS tc ', 
+            'JOIN information_schema.KEY_COLUMN_USAGE  cu ',
+            'ON tc.table_schema=cu.table_schema and tc.table_name=cu.table_name ', 
+              'and tc.constraint_name=cu.constraint_name ',
+              'and tc.constraint_type=\'PRIMARY KEY\') pk ',
+          'ON pk.table_schema=c.table_schema ',  
+          'AND pk.table_name=c.table_name ',
+          'AND pk.column_name=c.column_name ',
       'WHERE t.TABLE_NAME =', wrapSingleQuote(tableName)
     ].join(' ');
 

lib/dialects/postgres/query-generator.js

@@ -101,14 +101,23 @@ const QueryGenerator = {
     if (!schema) {
       schema = 'public';
     }
-
-    return 'SELECT tc.constraint_type as "Constraint", c.column_name as "Field", c.column_default as "Default", c.is_nullable as "Null", ' +
-      "CASE WHEN c.udt_name = 'hstore' " +
-      'THEN c.udt_name ELSE c.data_type END as "Type", (SELECT array_agg(e.enumlabel) ' +
-      'FROM pg_catalog.pg_type t JOIN pg_catalog.pg_enum e ON t.oid=e.enumtypid WHERE t.typname=c.udt_name) AS "special" ' +
+    return 'SELECT pk.constraint_type as "Constraint", c.column_name as "Field", ' + 
+              'c.column_default as "Default", c.is_nullable as "Null", ' +
+              'CASE WHEN c.udt_name = \'hstore\' THEN c.udt_name ELSE c.data_type END as "Type", ' + 
+              '(SELECT array_agg(e.enumlabel) ' +
+              'FROM pg_catalog.pg_type t JOIN pg_catalog.pg_enum e ON t.oid=e.enumtypid ' + 
+              'WHERE t.typname=c.udt_name) AS "special" ' +
             'FROM information_schema.columns c ' +
-      'LEFT JOIN information_schema.key_column_usage cu ON c.table_name = cu.table_name AND cu.column_name = c.column_name ' +
-      'LEFT JOIN information_schema.table_constraints tc ON c.table_name = tc.table_name AND cu.column_name = c.column_name AND tc.constraint_type = \'PRIMARY KEY\' ' +
+            'LEFT JOIN (SELECT tc.table_schema, tc.table_name, ' + 
+              'cu.column_name, tc.constraint_type ' +
+              'FROM information_schema.TABLE_CONSTRAINTS tc ' +
+              'JOIN information_schema.KEY_COLUMN_USAGE  cu ' +
+              'ON tc.table_schema=cu.table_schema and tc.table_name=cu.table_name ' + 
+                'and tc.constraint_name=cu.constraint_name ' +
+                'and tc.constraint_type=\'PRIMARY KEY\') pk ' +
+            'ON pk.table_schema=c.table_schema ' +
+            'AND pk.table_name=c.table_name ' +
+            'AND pk.column_name=c.column_name ' +
       `WHERE c.table_name = ${this.escape(tableName)} AND c.table_schema = ${this.escape(schema)} `;
   },
 

lib/dialects/sqlite/query.js

@@ -213,7 +213,7 @@ class Query extends AbstractQuery {
                         type: _result.type,
                         allowNull: (_result.notnull === 0),
                         defaultValue,
-                        primaryKey : (_result.pk === 1)
+                        primaryKey: (_result.pk !== 0)
                       };
 
                       if (result[_result.name].type === 'TINYINT(1)') {

test/integration/query-interface.test.js

@@ -206,6 +206,43 @@ describe(Support.getTestDialectTeaser('QueryInterface'), function() {
         });
       });
     });
+
+    it('should correctly determine the primary key columns', function () {
+      var self = this;
+      var Country = self.sequelize.define('_Country', {
+        code:     {type: DataTypes.STRING, primaryKey: true },
+        name:     {type: DataTypes.STRING, allowNull: false}
+      }, { freezeTableName: true });
+      var Alumni = self.sequelize.define('_Alumni', {
+        year:     {type: DataTypes.INTEGER, primaryKey: true },
+        num:      {type: DataTypes.INTEGER, primaryKey: true },
+        username: {type: DataTypes.STRING, allowNull: false, unique: true },
+        dob:      {type: DataTypes.DATEONLY, allowNull: false },
+        dod:      {type: DataTypes.DATEONLY, allowNull: true },
+        city:     {type: DataTypes.STRING, allowNull: false},
+        ctrycod:  {type: DataTypes.STRING, allowNull: false,
+                    references: { model: Country, key: 'code'}}
+      }, { freezeTableName: true });
+
+      return Country.sync({ force: true }).then(function() {
+        return self.queryInterface.describeTable('_Country').then(function(metacountry) {
+          expect(metacountry.code.primaryKey).to.eql(true);
+          expect(metacountry.name.primaryKey).to.eql(false);
+        
+          return Alumni.sync({ force: true }).then(function() {
+            return self.queryInterface.describeTable('_Alumni').then(function(metalumni) {
+              expect(metalumni.year.primaryKey).to.eql(true);
+              expect(metalumni.num.primaryKey).to.eql(true);
+              expect(metalumni.username.primaryKey).to.eql(false);
+              expect(metalumni.dob.primaryKey).to.eql(false);
+              expect(metalumni.dod.primaryKey).to.eql(false);
+              expect(metalumni.ctrycod.primaryKey).to.eql(false);
+              expect(metalumni.city.primaryKey).to.eql(false);
+            });
+          });
+        });
+      });
+    });
   });
 
   // FIXME: These tests should make assertions against the created table using describeTable