bug(postgres) Fall back to latest version if parsing db version fails. Closes #4368

changelog.md

+# Next
+- [FIXED] Fall back to a default version when parsing the DB version fails [#4368](https://github.com/sequelize/sequelize/issues/4368)
+
 # 3.6.0
 - [ADDED] Model.findCreateFind: A more performant findOrCreate that will not work under a transaction (atleast not in postgres)
 - [FIXED] Show indexes query on Postgres fails to return functional indexes [#3911](https://github.com/sequelize/sequelize/issues/3911)

lib/dialects/abstract/connection-manager.js

@@ -3,6 +3,7 @@
 var Pooling = require('generic-pool')
   , Promise = require('../../promise')
   , _ = require('lodash')
+  , semver = require('semver')
   , defaultPoolingConfig = {
     max: 5,
     min: 0,
@@ -196,7 +197,8 @@ ConnectionManager.prototype.getConnection = function(options) {
         _options.logging.__testLoggingFn = true;
 
         return self.sequelize.databaseVersion(_options).then(function (version) {
-          self.sequelize.options.databaseVersion = version;
+          self.sequelize.options.databaseVersion = semver.valid(version) ? version : self.defaultVersion;
+
           self.versionPromise = undefined;
 
           self.$disconnect(connection);
@@ -216,6 +218,7 @@ ConnectionManager.prototype.getConnection = function(options) {
     });
   });
 };
+
 ConnectionManager.prototype.releaseConnection = function(connection) {
   var self = this;
 

lib/dialects/mysql/index.js

@@ -36,6 +36,7 @@ MysqlDialect.prototype.supports = _.merge(_.cloneDeep(Abstract.prototype.support
   GEOMETRY: true
 });
 
+ConnectionManager.prototype.defaultVersion = '5.6.0';
 MysqlDialect.prototype.Query = Query;
 MysqlDialect.prototype.QueryGenerator = QueryGenerator;
 MysqlDialect.prototype.DataTypes = DataTypes;

lib/dialects/postgres/index.js

@@ -49,6 +49,7 @@ PostgresDialect.prototype.supports = _.merge(_.cloneDeep(Abstract.prototype.supp
   deferrableConstraints: true
 });
 
+ConnectionManager.prototype.defaultVersion = '9.4.0';
 PostgresDialect.prototype.Query = Query;
 PostgresDialect.prototype.DataTypes = DataTypes;
 PostgresDialect.prototype.name = 'postgres';

lib/dialects/sqlite/index.js

@@ -29,6 +29,7 @@ SqliteDialect.prototype.supports = _.merge(_.cloneDeep(Abstract.prototype.suppor
   groupedLimit: false
 });
 
+ConnectionManager.prototype.defaultVersion = '3.8.0';
 SqliteDialect.prototype.Query = Query;
 SqliteDialect.prototype.DataTypes = DataTypes;
 SqliteDialect.prototype.name = 'sqlite';