MongoDB issues with Grails Scaffolding (do not occur in MySQL) - mongodb

Question

I tried using MongoDB 2.0.6 to replace MySQL 5.5.25 for a test Grails 2.1 App and am encountering some strange problems.
Issues when using MongoDB but not MySQL:
When using Scaffolding, I cannot get the fields to order by using static constraints
When I specify inList as a constraint, I get a drop-down when using a MySQL backend, but a field when using a MongoDB backend.
No * (asterisk) on fields where blank=false constraint specified.
Domain Class:
package study
class Student {
String login
String firstName
String lastName
String gender
Boolean active
Date dateCreated
Date lastUpdated
static constraints = {
login()
firstName(blank: false)
lastName(blank: false)
gender(inList: ['M', 'F'])
active()
}
}
Controller
package study
class StudentController {
def scaffold = true
}
DataSource.groovy (MySQL stuff commented out):
grails {
mongo {
host = "dev-linux"
port = 27017
username = "study"
password= "********"
databaseName = "study"
}
}
//dataSource {
// pooled = true
// driverClassName = "com.mysql.jdbc.Driver"
// dialect = "org.hibernate.dialect.MySQL5InnoDBDialect"
// username = "study"
// password = "********"
// dbCreate = "create-drop" // one of 'create', 'create-drop','update'
// url = "jdbc:mysql://dev-linux:3306/study"
//
//}
//hibernate {
// cache.use_second_level_cache = true
// cache.use_query_cache = true
// cache.provider_class = "net.sf.ehcache.hibernate.EhCacheProvider"
//}
BuildConfig.groovy (plugins section shown was all I changed to put MongoDB in place of MySQL, the remainder of this file is the default created by Grails)
plugins {
// build ":hibernate:$grailsVersion"
// compile ":mysql-connectorj:5.1.12"
compile ":mongodb:1.0.0.GA"
build ":tomcat:$grailsVersion"
}
The only changes I made to put in MongoDB and take out MySQL is the changes to the DataSource.groovy and BuildConfig.groovy shown above.
Is there any configuration item that I am missing?
I did see someone mention on this Nabble forum post that the field ordering may be an issue with MongoDB.
However, this post did not have any details.
Also, I did not understand why or how the back end Database engine could impact how the view is rendered when using scaffolding. Specifically, the ordering on a page and drop-down vs textfield.
I would have thought that would come from the Domain Class's field types and constraints.
Has anyone come across this odd behavior when using Grails+Scaffolding with MongoDB before? Does anyone know of a fix or have any insight?
Thank you very much in advance, I appreciate it.

Answer 1

Scaffolding with MongoDB works, the problem is if you just install mongodb plugin, grails will see ambiguous domain mappings and errors like these pop up. You need to either:
Remove hibernate plugin like this:
grails uninstall-plugin hibernate
Also remove these lines from BuildConfig.groovy:
runtime ":database-migration:1.1"
runtime ":hibernate:$grailsVersion"
Explicitly tell a given domain is persisted by Mongo by adding this line to it:
static mapWith="mongo"