Grails: Joda LocalDate as unique key in a MySQL database - mysql

Question

I have a domain class with a Joda LocalDate property. This property must be unique.
It works using an H2, but using a MySQL db I have this error on app boot:
[SchemaExport.create(l.386)]Unsuccessful: create table [...]
[SchemaExport.create(l.387)]BLOB/TEXT column 'mydate' used in key specification without a key length
If a remove unique constraint, it works also with MySQL.
Is it a bug or my misunderstanding?
I'm using Grails 2.2.5.
Here domain fragment:
class MyClass {
LocalDate mydate
static constraints = {
mydate(nullable:false, unique:true)
}
}
DataSource config fragment:
dataSource {
dbCreate = "create-drop"
driverClassName = "com.mysql.jdbc.Driver"
dialect = org.hibernate.dialect.MySQL5InnoDBDialect
username = "xxx"
password = "xxx"
dbNamer = "myapp"
url = "jdbc:mysql://localhost:3306/${dbNamer}?autoreconnect=true"
logSql = true
}

Answer 1

wild guess, I think that date is reserved word in mySQL. rename the field and try again
UPDATE:
ok, I see.
the problem is, that GORM/Hibernate is not aware of joda LocalDate class, so it's trying to create a BLOB column for it:
[SchemaExport.create(l.387)]BLOB/TEXT column 'mydate'`.
To fix it, you can either use a custom hibernate type (have no idea how), or convert the property into a plane java's Date class by saving, and back to LocalDate after loading