Workflow cloud_tenant fix

[kbrock]

fixes https://bugzilla.redhat.com/show_bug.cgi?id=1746931
Introduced #18353

This did not bring back the type column so all classes were VmOrType.
Since the cloud_tenant method is introduced in a subclass, it was missing.
Now that we are instantiating the correct class (with help from type) all is well.

[----] F, [2019-08-29T09:40:01.670066 #3373:2adf69a8c12c] FATAL -- : Error caught:
[NoMethodError] undefined method `cloud_tenant' for #<VmOrTemplate:0x000055bee25ff310>
Did you mean?  cloud_tenant_id
gems/activemodel-5.1.7/lib/active_model/attribute_methods.rb:432:in `method_missing'
app/models/miq_provision_virt_workflow.rb:1049:in `create_hash_struct_from_vm_or_template'

[NickLaMuro]

Crap... I guess you called this. Well, if there is a bug then no helping. 👍

[gmcculloug]

@kbrock I believe the fix is actually a little different and as you stated in the description it does not make sense that the cloud_tenant_id would be set if the model does not respond to cloud_tenant.

I was thinking that there must be some additional column that is needed for the cloud_tenant relationship to be defined. (And I had previously determined that removing the recently added select call allowed the code to work.

Through a little trail and error I found that adding the type column to the select list fixes the issue. And this all makes sense, as you can see below, that the initial where call returns an OpenStack Template model, but after the select it now contains a base model VmOrTemplate instance for the same VM. (The cloud_tenant association is defined down at the OpenStack sub-classed model.) Finally, adding type back we are able to load the proper sub-class.

irb(main):001:0> vms = VmOrTemplate.where(:id => 3773)
=> #<ActiveRecord::Relation [#<ManageIQ::Providers::Openstack::CloudManager::Template id: 3773, vendor: "openstack"...

irb(main):002:0> vms = vms.select(:id, :name, :guid, :uid_ems, :ems_id, :cloud_tenant_id)
=> #<ActiveRecord::Relation [#<VmOrTemplate id: 3773, name: "HUIS-EvmSnapshot", guid: "6e45d27a-3d57-11e6-ab22-6003089fa294"...

irb(main):003:0> vms.first.cloud_tenant
NoMethodError (undefined method `cloud_tenant' for #<VmOrTemplate:0x00007fe989c36778>)

irb(main):004:0> vms = vms.select(:id, :name, :guid, :uid_ems, :ems_id, :cloud_tenant_id, :type)
=> #<ActiveRecord::Relation [#<ManageIQ::Providers::Openstack::CloudManager::Template id: 3773, name: "HUIS-EvmSnapshot"...

irb(main):005:0> vms.first.cloud_tenant
=> #<ManageIQ::Providers::Openstack::CloudManager::CloudTenant id: 10, name: "admin", description: "admin tenant"...

In the end I think the proper code change is to add :type to the select statement so the sub-class is loaded.

     # Only select the colums we need
-    vms = vms.select(:id, :name, :guid, :uid_ems, :ems_id, :cloud_tenant_id)
+    vms = vms.select(:id, :name, :guid, :uid_ems, :ems_id, :cloud_tenant_id, :type)

[NickLaMuro]

@gmcculloug oh yeah, that makes so much sense now. Since I was the original author to this mess, I am happy to here that the cloud_tenant_id idea wasn't too far off, and the only real issue was me missing something in the select. Thanks for the great sleuthing!

@kbrock we probably should have a test case for this if possible, but unsure how you would do that.

[NickLaMuro]

See Greg M's comment

[miq-bot]

Checked commit kbrock@c988392 with ruby 2.4.6, rubocop 0.69.0, haml-lint 0.20.0, and yamllint 1.10.0
1 file checked, 0 offenses detected
Everything looks fine. 🍪

[gmcculloug]

Looks good. I would suggest updating the PR description as well.

[simaishi]

Ivanchuk backport details:

$ git log -1
commit b8dd448f4e4c08cc0798fc20c7ea78ce608686e7
Author: Joe Rafaniello <jrafanie@users.noreply.github.com>
Date:   Tue Sep 3 11:06:20 2019 -0400

    Merge pull request #19237 from kbrock/miq_provision_virt_workflow_cloud_tenant
    
    Workflow cloud_tenant fix
    
    (cherry picked from commit b598db0dec6fbbe8fdaa4554fac193f7d6e0d3be)
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1746931