Allow snippet move actions without an existing file name

app/models/snippet_input_action.rb

@@ -15,7 +15,7 @@ class SnippetInputAction
 
   validates :action, inclusion: { in: ACTIONS, message: "%{value} is not a valid action" }
   validates :previous_path, presence: true, if: :move_action?
-  validates :file_path, presence: true, unless: :create_action?
+  validates :file_path, presence: true, if: -> (action) { action.update_action? || action.delete_action? }
   validates :content, presence: true, if: -> (action) { action.create_action? || action.update_action? }
   validate :ensure_same_file_path_and_previous_path, if: :update_action?
   validate :ensure_different_file_path_and_previous_path, if: :move_action?

changelogs/unreleased/239341-fj-allow-snippet-move-action-without-file-path.yml

+---
+title: Allow snippet move action without an existing file name
+merge_request: 40343
+author:
+type: fixed

spec/models/snippet_input_action_spec.rb

@@ -22,9 +22,9 @@ RSpec.describe SnippetInputAction do
       :move    | 'foobar'  | 'foobar' | nil      | nil                | false | :previous_path
       :move    | 'foobar'  | 'foobar' | ''       | nil                | false | :previous_path
       :move    | 'foobar'  | 'foobar' | 'foobar' | nil                | false | :file_path
-      :move    | nil       | 'foobar' | 'foobar' | nil                | false | :file_path
-      :move    | ''        | 'foobar' | 'foobar' | nil                | false | :file_path
-      :move    | nil       | 'foobar' | 'foo1'   | nil                | false | :file_path
+      :move    | nil       | 'foobar' | 'foobar' | nil                | true  | nil
+      :move    | ''        | 'foobar' | 'foobar' | nil                | true  | nil
+      :move    | nil       | 'foobar' | 'foo1'   | nil                | true  | nil
       :move    | 'foobar'  | nil      | 'foo1'   | nil                | true  | nil
       :move    | 'foobar'  | ''       | 'foo1'   | nil                | true  | nil
       :create  | 'foobar'  | nil      | 'foobar' | nil                | false | :content

spec/services/snippets/update_service_spec.rb

@@ -479,6 +479,22 @@ RSpec.describe Snippets::UpdateService do
               expect(blob.data).to eq content
             end
           end
+
+          context 'when the file_path is not present' do
+            let(:snippet_actions) { [{ action: :move, previous_path: file_path }] }
+
+            it 'generates the name for the renamed file' do
+              old_blob = blob(file_path)
+
+              expect(blob('snippetfile1.txt')).to be_nil
+              expect(subject).to be_success
+
+              new_blob = blob('snippetfile1.txt')
+
+              expect(new_blob).to be_present
+              expect(new_blob.data).to eq old_blob.data
+            end
+          end
         end
 
         context 'delete action' do