Using with_items loop with vmware_guest module

[Matti Rantakömi]

I'm trying to create new VM with multiple disks using vmware_guest module. VM details are defined in host_vars file. Everything is working fine except that I can't get disk definition working when multiple disks are defined.

I have tried the following:

Disk definition in host_vars:

vmware_guest_disks:
  disk1:
    size_gb: 20
    datastore: datastore1
  disk2:
    size_gb: 1
    datastore: datastore1
  disk3:
    size_gb: 2
    datastore: datastore1

Task used create new VM:

  - name: Create new VM
    vmware_guest:
      hostname: 192.168.1.2
      username: administrator@vsphere.local
      password: password
      datacenter: datacenter
      cluster: cluster
      name: guestname
      guest_id: centos64guest
      template: templatename
      validate_certs: no
      hardware:
        memory_mb: 1024
        num_cpus: 1
      customization:
        dns_servers:
        - 8.8.8.8
        - 8.8.4.4
        hostname: guesthostname
        domain: guestdomain
        password: password
      networks:
      - vlan: 1
        ip: 192.168.1.100
        netmask: 255.255.255.0
        gateway: 192.186.1.1
      disk:
      - size_gb: "{{ item.value.size_gb }}"
      - datastore: "{{ item.value.datastore }}"
    with_items: "{{ vmware_guest_disks | default({}) }}"
    register: deploy

Tasks fails but if it had succeeded as I though it should have created new VM with disks which details have been taken from host_vars (disks with sizes 20, 1 and 2 GB placed on datastore1). What I'm doing wrong and is there some better way than using with_items to loop through multiple variables?