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[Mikhail <mlelyakin@xxxxxxxxxxxx>]

Public bug reported:

I work on Sahara Dashboard plugin. We use "DeleteAction" class from "table" module. We have a list of Node group Templates. During object deletion we can have some errors. (As a result of internal Sahara behavior). 
User sees the message about the error: "Error: Unable to delete template: ml-master".
I think it will be more useful if we add an exception string to the error message. For instance: "Unable to delete template ml-master" by follow reason: "Node group template with id=1 are used in Cluster template".
We can add to https://github.com/openstack/horizon/blob/master/horizon/tables/actions.py#L866 error message from ex instance of Exception.

** Affects: horizon
     Importance: Undecided
     Assignee: Mikhail (mlelyakin)
         Status: New

** Changed in: horizon
     Assignee: (unassigned) => Mikhail (mlelyakin)

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https://bugs.launchpad.net/bugs/1610229

Title:
  Horizon shows unhelpful error message by object deletion

Status in OpenStack Dashboard (Horizon):
  New

Bug description:
  I work on Sahara Dashboard plugin. We use "DeleteAction" class from "table" module. We have a list of Node group Templates. During object deletion we can have some errors. (As a result of internal Sahara behavior). 
  User sees the message about the error: "Error: Unable to delete template: ml-master".
  I think it will be more useful if we add an exception string to the error message. For instance: "Unable to delete template ml-master" by follow reason: "Node group template with id=1 are used in Cluster template".
  We can add to https://github.com/openstack/horizon/blob/master/horizon/tables/actions.py#L866 error message from ex instance of Exception.

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