# Dynamic Workflow - Ruby SDK

> This section explains Dynamic Workflows with the Ruby SDK

## Set a Dynamic Workflow 

A Dynamic Workflow in Temporal is a Workflow that is invoked dynamically at runtime if no other Workflow with the same name is registered.
A Workflow can be made dynamic by invoking `workflow_dynamic` class method at the top of the definition.
You must register the Workflow with the Worker before it can be invoked.
Only one Dynamic Workflow can be present on a Worker.

Often, dynamic is used in conjunction with `workflow_raw_args` which does not convert arguments but instead passes them
through as a splatted array of `Temporalio::Converters::RawValue` instances.

```ruby
class MyDynamicWorkflow < Temporalio::Workflow::Definition
  # Make this the dynamic workflow and accept raw args
  workflow_dynamic
  workflow_raw_args

  def execute(*raw_args)
    # Require a single arg for our workflow
    raise Temporalio::Error::ApplicationError, 'One arg expected' unless raw_args.size == 1

    # Use payload converter to convert it
    name = Temporalio::Workflow.payload_converter.from_payload(raw_args.first.payload)
    Temporalio::Workflow.execute_activity(
      MyActivity,
      { greeting: 'Hello', name: },
      start_to_close_timeout: 100
    )
  end
end
```