app/views/workflows/_assign_plate_purpose.html.erb
<%= form_for @task,
url: {
action: "stage",
id: @stage,
workflow_id: @workflow.id,
batch_id: @batch.id,
next_stage: true },
html: { id: "stage_form"} do |form| %>
<fieldset>
<legend>Please Choose a Purpose for Your Output Plates:</legend>
<label for="assign_plate_purpose_task_plate_purpose_id">Plate Purpose</label>:
<%= form.select :plate_purpose_id, @plate_purpose_options %>
</fieldset>
<%= render partial: "next_stage_submit" %>
<% end -%>