Fixed issue #2170 by moving channel setting to the model

app/assets/javascripts/app/controllers/_channel/email.coffee

@@ -60,68 +60,23 @@ class App.ChannelEmailFilter extends App.Controller
 
   new: (e) =>
     e.preventDefault()
-    new App.ChannelEmailFilterEdit(
+    new App.ControllerGenericNew(
+      pageData:
+        object: 'Postmaster Filter'
+      genericObject: 'PostmasterFilter'
       container: @el.closest('.content')
+      callback: @load
     )
     
   edit: (id, e) =>
     e.preventDefault()
-    new App.ChannelEmailFilterEdit(
-      object:    App.PostmasterFilter.find(id)
+    new App.ControllerGenericEdit(
+      id: id,
+      pageData:
+        object: 'Postmaster Filter'
+      genericObject: 'PostmasterFilter'
       container: @el.closest('.content')
-    )
-
-class App.ChannelEmailFilterEdit extends App.ControllerModal
-  buttonClose: true
-  buttonCancel: true
-  buttonSubmit: true
-  head: 'Postmaster Filter'
-
-  content: =>
-    if @object
-      @form = new App.ControllerForm(
-        model:     App.PostmasterFilter,
-        params:    @object,
-        autofocus: true,
-      )
-    else
-      @form = new App.ControllerForm(
-        model:     App.PostmasterFilter,
-        autofocus: true,
-      )
-
-    @form.form
-
-  onSubmit: (e) =>
-    e.preventDefault()
-
-    # get params
-    params = @formParam(e.target)
-    params['channel'] = 'email'
-
-    object = @object || new App.PostmasterFilter
-    object.load(params)
-
-    # validate form
-    errors = @form.validate(params)
-
-    # show errors in form
-    if errors
-      @log 'error', errors
-      @formValidate(form: e.target, errors: errors)
-      return false
-
-    # disable form
-    @formDisable(e)
-
-    # save object
-    object.save(
-      done: =>
-        @close()
-      fail: (settings, details) =>
-        @log 'errors', details
-        @formEnable(e)
-        @form.showAlert(details.error_human || details.error || 'Unable to create object!')
+      callback: @load
     )
 
 class App.ChannelEmailSignature extends App.Controller

app/assets/javascripts/app/models/postmaster_filter.coffee

@@ -21,3 +21,6 @@ class App.PostmasterFilter extends App.Model
     'name',
   ]
   @configure_clone = true
+
+  @on 'create', (newRecord) ->
+    newRecord.channel = 'email'

test/browser/admin_channel_email_test.rb

@@ -128,4 +128,56 @@ class AdminChannelEmailTest < TestCase
 
   end
 
+  # test the creation and cloning of Postmaster filters
+  # confirm fix for issue #2170 - Cannot clone PostmasterFilter
+  def test_filter_clone
+    filter_name = "Test Filter #{rand(999_999)}"
+
+    @browser = browser_instance
+    login(
+      username: 'master@example.com',
+      password: 'test',
+      url: browser_url,
+    )
+    tasks_close_all()
+
+    click(css: 'a[href="#manage"]')
+    click(css: '.content.active a[href="#channels/email"]')
+
+    click(css: '.content.active a[href="#c-filter"]')
+
+    # create a new email filter
+    click(css: '.content.active a[data-type="new"]')
+
+    modal_ready()
+    set(
+      css: '.modal input[name="name"]',
+      value: filter_name,
+    )
+    set(
+      css: '.modal input[name="match::from::value"]',
+      value: 'target',
+    )
+    click(css: '.modal .js-submit')
+    modal_disappear()
+
+    watch_for(
+      css: '.content.active .table',
+      value: filter_name,
+    )
+
+    # now clone filter that we just created
+    click(css: '.content.active .table #tableActions')
+    click(css: '.content.active .table .dropdown .js-clone')
+
+    modal_ready()
+    click(css: '.modal .js-submit')
+    modal_disappear()
+
+    # confirm the clone exists in the table
+    watch_for(
+      css: '.content.active .table',
+      value: "Clone: #{filter_name}",
+    )
+  end
 end