feat(sequelize): allow passing dialectOptions.options from url (#12412)

lib/sequelize.js

@@ -212,10 +212,20 @@ class Sequelize {
       }
 
       if (urlParts.query) {
-        if (options.dialectOptions)
+        if (options.dialectOptions) {
           Object.assign(options.dialectOptions, urlParts.query);
-        else
+        } else {
           options.dialectOptions = urlParts.query;
+          if (urlParts.query.options) {
+            try {
+              const o = JSON.parse(urlParts.query.options);
+              options.dialectOptions.options = o;
+            } catch (e) {
+              // Nothing to do, string is not a valid JSON
+              // an thus does not need any further processing
+            }
+          }
+        }
       }
     } else {
       // new Sequelize(database, username, password, { ... options })

test/unit/configuration.test.js

@@ -179,5 +179,11 @@ describe('Sequelize', () => {
       expect(dialectOptions.application_name).to.equal('client');
       expect(dialectOptions.ssl).to.equal('true');
     });
+
+    it('should handle JSON options', () => {
+      const sequelizeWithOptions = new Sequelize('mysql://example.com:9821/dbname?options={"encrypt":true}&anotherOption=1');
+      expect(sequelizeWithOptions.options.dialectOptions.options.encrypt).to.be.true;
+      expect(sequelizeWithOptions.options.dialectOptions.anotherOption).to.equal('1');
+    });
   });
 });