how can i dynamic update Datasource.groovy file - grails

Question

in a grails project, there will a file named DataSource.groovy. Such as follows:
dataSource {
pooled = true
driverClassName = "org.h2.Driver"
username = "sa"
password = ""
}
mongodb {
host = 127.0.0.1// adjust this according to your settings
port = 27017
databaseName = 'test'
username = 'user' // database user and password, if server requires authentication
password = 's3cret'
}
My question is that how can I set for example mongodb.host dynamically at run time.

Answer 1

If you have different MongoDB Hosts, you can set up different environments for development, test, and production using the environments closure in your DataSource.groovy.
In your example above, let's say that you are using localhost 127.0.0.1 for development and mongo-prodserver for production
environments {
development {
grails {
mongo {
host = "127.0.0.1"
port = 27017
username = "user"
password= "s3cret"
databaseName = "test"
}
}
}
production {
grails {
mongo {
host = "mongo-prodserver"
port = 27017
username = "user"
password= "s3cret"
databaseName = "prod"
}
}
}
...
}
Here is the link to Grails Doc on DataSources and Environments.