Using squeryl with Scala. [RuntimeException: no session is bound to current thread, a session must be created via Session.create and bound to the thread via ‘work’ or ‘bindToCurrentThread’]

I was playing with Play and Scala. I decided to use Squeryl for Data access.

Here’s my model class models/Product.scala

package models

import org.squeryl.KeyedEntity
import org.squeryl.PrimitiveTypeMode.inTransaction
import org.squeryl.PrimitiveTypeMode._
import org.squeryl.Schema

object AppDB extends Schema {
  val productsTable = table[Product]("products")
}

case class Product (name:String,price:Long) extends KeyedEntity[Long] {
	val id:Long = 0;
}

object Product {
  def create (product:Product)= transaction {
    AppDB.productsTable insert(product)
  }

  def all:Iterable[Product] = inTransaction {
    val products = from (AppDB.productsTable)(productsTable => 
    		select(productsTable))
    products.toIterable
  }
}

Here’s my controller controllers/Products.scala

package controllers

import play.mvc.Controller
import play.api.mvc._
import play.api.mvc.Results._
object Products extends Controller {

	def index = Action {
		  val products = models.Product.all
		  Ok(views.html.products.index(products))

	}

}

Now, when I run my app localhost:8080/products I get the following error.
[RuntimeException: no session is bound to current thread, a session must be created via Session.create and bound to the thread via ‘work’ or ‘bindToCurrentThread’]

It appears that I should have wrapped the index action in Products controller around a transaction block. Here’s the updated code.

package controllers

import play.mvc.Controller
import play.api.mvc._
import play.api.mvc.Results._
object Products extends Controller {

	def index = Action { 
                  transaction {
		  val products = models.Product.all
		  Ok(views.html.products.index(products))
                  }

	}

}

After this I was able to load products pages. I have to dig deeper to get the details. Will update when I find more information.