Fix bug in snippet edit page

We need to update the snippet edit form
to include the blob data and not the
snippet info.

app/controllers/concerns/snippets_actions.rb

@@ -4,6 +4,11 @@ module SnippetsActions
   extend ActiveSupport::Concern
 
   def edit
+    # We need to load some info from the existing blob
+    snippet.content = blob.data
+    snippet.file_name = blob.path
+
+    render 'edit'
   end
 
   def raw
@@ -25,6 +30,18 @@ module SnippetsActions
 
   private
 
+  # rubocop:disable Gitlab/ModuleWithInstanceVariables
+  def blob
+    return unless snippet
+
+    @blob ||= if Feature.enabled?(:version_snippets, current_user) && !snippet.repository.empty?
+                snippet.blobs.first
+              else
+                snippet.blob
+              end
+  end
+  # rubocop:enable Gitlab/ModuleWithInstanceVariables
+
   def convert_line_endings(content)
     params[:line_ending] == 'raw' ? content : content.gsub(/\r\n/, "\n")
   end

app/controllers/projects/snippets_controller.rb

@@ -121,16 +121,6 @@ class Projects::SnippetsController < Projects::ApplicationController
   alias_method :awardable, :snippet
   alias_method :spammable, :snippet
 
-  def blob
-    return unless snippet
-
-    @blob ||= if Feature.enabled?(:version_snippets, current_user) && !snippet.repository.empty?
-                snippet.blobs.first
-              else
-                snippet.blob
-              end
-  end
-
   def spammable_path
     project_snippet_path(@project, @snippet)
   end

app/controllers/snippets_controller.rb

@@ -126,16 +126,6 @@ class SnippetsController < ApplicationController
   alias_method :awardable, :snippet
   alias_method :spammable, :snippet
 
-  def blob
-    return unless snippet
-
-    @blob ||= if Feature.enabled?(:version_snippets, current_user) && !snippet.repository.empty?
-                snippet.blobs.first
-              else
-                snippet.blob
-              end
-  end
-
   def spammable_path
     snippet_path(@snippet)
   end

changelogs/unreleased/fj-fix-snippet-edit-page.yml

+---
+title: Show the proper information in snippet edit form
+merge_request: 27479
+author:
+type: fixed

spec/features/projects/snippets/user_updates_snippet_spec.rb

@@ -2,13 +2,17 @@
 
 require 'spec_helper'
 
-describe 'Projects > Snippets > User updates a snippet' do
+describe 'Projects > Snippets > User updates a snippet', :js do
   let_it_be(:user) { create(:user) }
   let_it_be(:project) { create(:project, namespace: user.namespace) }
-  let!(:snippet) { create(:project_snippet, project: project, author: user) }
+  let_it_be(:snippet, reload: true) { create(:project_snippet, :repository, project: project, author: user) }
+
+  let(:version_snippet_enabled) { true }
 
   before do
     stub_feature_flags(snippets_vue: false)
+    stub_feature_flags(version_snippets: version_snippet_enabled)
+
     project.add_maintainer(user)
     sign_in(user)
 
@@ -17,6 +21,29 @@ describe 'Projects > Snippets > User updates a snippet' do
     page.within('.detail-page-header') do
       first(:link, 'Edit').click
     end
+    wait_for_all_requests
+  end
+
+  it 'displays the snippet blob path and content' do
+    blob = snippet.blobs.first
+
+    aggregate_failures do
+      expect(page.find_field('project_snippet_file_name').value).to eq blob.path
+      expect(page.find('.file-content')).to have_content(blob.data.strip)
+      expect(page.find('.snippet-file-content', visible: false).value).to eq blob.data
+    end
+  end
+
+  context 'when feature flag :version_snippets is disabled' do
+    let(:version_snippet_enabled) { false }
+
+    it 'displays the snippet file_name and content' do
+      aggregate_failures do
+        expect(page.find_field('project_snippet_file_name').value).to eq snippet.file_name
+        expect(page.find('.file-content')).to have_content(snippet.content)
+        expect(page.find('.snippet-file-content', visible: false).value).to eq snippet.content
+      end
+    end
   end
 
   it 'updates a snippet' do

spec/features/snippets/user_edits_snippet_spec.rb

@@ -5,18 +5,43 @@ require 'spec_helper'
 describe 'User edits snippet', :js do
   include DropzoneHelper
 
-  let(:file_name) { 'test.rb' }
-  let(:content) { 'puts "test"' }
-
+  let_it_be(:file_name) { 'test.rb' }
+  let_it_be(:content) { 'puts "test"' }
   let_it_be(:user) { create(:user) }
-  let(:snippet) { create(:personal_snippet, :public, file_name: file_name, content: content, author: user) }
+  let_it_be(:snippet, reload: true) { create(:personal_snippet, :repository, :public, file_name: file_name, content: content, author: user) }
+
+  let(:version_snippet_enabled) { true }
 
   before do
     stub_feature_flags(snippets_vue: false)
+    stub_feature_flags(version_snippets: version_snippet_enabled)
+
     sign_in(user)
 
     visit edit_snippet_path(snippet)
-    wait_for_requests
+    wait_for_all_requests
+  end
+
+  it 'displays the snippet blob path and content' do
+    blob = snippet.blobs.first
+
+    aggregate_failures do
+      expect(page.find_field('personal_snippet_file_name').value).to eq blob.path
+      expect(page.find('.file-content')).to have_content(blob.data.strip)
+      expect(page.find('.snippet-file-content', visible: false).value).to eq blob.data
+    end
+  end
+
+  context 'when feature flag :version_snippets is disabled' do
+    let(:version_snippet_enabled) { false }
+
+    it 'displays the snippet file_name and content' do
+      aggregate_failures do
+        expect(page.find_field('personal_snippet_file_name').value).to eq file_name
+        expect(page.find('.file-content')).to have_content(content)
+        expect(page.find('.snippet-file-content', visible: false).value).to eq content
+      end
+    end
   end
 
   it 'updates the snippet' do