rewrite admin users controller (use 1 variable and find by username)

app/controllers/admin/users_controller.rb

@@ -7,25 +7,21 @@ class Admin::UsersController < Admin::ApplicationController
   end
 
   def show
-    @admin_user = User.find(params[:id])
-
-    @projects = if @admin_user.authorized_projects.empty?
+    projects = if admin_user.authorized_projects.empty?
                Project
              else
-               Project.without_user(@admin_user)
+               Project.without_user(admin_user)
              end.all
   end
 
   def team_update
-    @admin_user = User.find(params[:id])
-
     UsersProject.add_users_into_projects(
       params[:project_ids],
-      [@admin_user.id],
+      [admin_user.id],
       params[:project_access]
     )
 
-    redirect_to [:admin, @admin_user], notice: 'Teams were successfully updated.'
+    redirect_to [:admin, admin_user], notice: 'Teams were successfully updated.'
   end
 
 
@@ -34,13 +30,11 @@ class Admin::UsersController < Admin::ApplicationController
   end
 
   def edit
-    @admin_user = User.find(params[:id])
+    admin_user
   end
 
   def block
-    @admin_user = User.find(params[:id])
-
-    if @admin_user.block
+    if admin_user.block
       redirect_to :back, alert: "Successfully blocked"
     else
       redirect_to :back, alert: "Error occured. User was not blocked"
@@ -48,9 +42,7 @@ class Admin::UsersController < Admin::ApplicationController
   end
 
   def unblock
-    @admin_user = User.find(params[:id])
-
-    if @admin_user.update_attribute(:blocked, false)
+    if admin_user.update_attribute(:blocked, false)
       redirect_to :back, alert: "Successfully unblocked"
     else
       redirect_to :back, alert: "Error occured. User was not unblocked"
@@ -82,30 +74,34 @@ class Admin::UsersController < Admin::ApplicationController
       params[:user].delete(:password_confirmation)
     end
 
-    @admin_user = User.find(params[:id])
-    @admin_user.admin = (admin && admin.to_i > 0)
+    admin_user.admin = (admin && admin.to_i > 0)
 
     respond_to do |format|
-      if @admin_user.update_attributes(params[:user], as: :admin)
-        format.html { redirect_to [:admin, @admin_user], notice: 'User was successfully updated.' }
+      if admin_user.update_attributes(params[:user], as: :admin)
+        format.html { redirect_to [:admin, admin_user], notice: 'User was successfully updated.' }
         format.json { head :ok }
       else
         format.html { render action: "edit" }
-        format.json { render json: @admin_user.errors, status: :unprocessable_entity }
+        format.json { render json: admin_user.errors, status: :unprocessable_entity }
       end
     end
   end
 
   def destroy
-    @admin_user = User.find(params[:id])
-    if @admin_user.personal_projects.count > 0
+    if admin_user.personal_projects.count > 0
       redirect_to admin_users_path, alert: "User is a project owner and can't be removed." and return
     end
-    @admin_user.destroy
+    admin_user.destroy
 
     respond_to do |format|
-      format.html { redirect_to admin_users_url }
+      format.html { redirect_to admin_users_path }
       format.json { head :ok }
     end
   end
+
+  protected
+
+  def admin_user
+    @admin_user ||= User.find_by_username(params[:id])
+  end
 end