Refactor: use keyword arguments for optional parameters

app/models/wiki_page.rb

@@ -192,7 +192,7 @@ class WikiPage
   #
   # Returns the String SHA1 of the newly created page
   # or False if the save was unsuccessful.
-  def update(new_content = "", format = :markdown, message = nil, last_commit_sha = nil)
+  def update(new_content, format: :markdown, message: nil, last_commit_sha: nil)
     @attributes[:content] = new_content
     @attributes[:format] = format
 

app/services/wiki_pages/update_service.rb

 module WikiPages
   class UpdateService < WikiPages::BaseService
     def execute(page)
-      if page.update(@params[:content], @params[:format], @params[:message], @params[:last_commit_sha])
+      if page.update(@params[:content], format: @params[:format], message: @params[:message], last_commit_sha: @params[:last_commit_sha])
         execute_hooks(page, 'update')
       end
 

spec/models/wiki_page_spec.rb

@@ -212,14 +212,14 @@ describe WikiPage, models: true do
     context 'with same last commit sha' do
       it 'returns true' do
         last_commit_sha = @page.commit.sha
-        expect(@page.update('more content', :markdown, nil, last_commit_sha)).to be_truthy
+        expect(@page.update('more content', last_commit_sha: last_commit_sha)).to be_truthy
       end
     end
 
     context 'with different last commit sha' do
       it 'raises exception' do
         last_commit_sha = 'xxx'
-        expect { @page.update('more content', :markdown, nil, last_commit_sha) }.to raise_error(WikiPage::PageChangedError)
+        expect { @page.update('more content', last_commit_sha: last_commit_sha) }.to raise_error(WikiPage::PageChangedError)
       end
     end
   end