Add project editing.

app/controllers/projects_controller.rb

@@ -21,6 +21,21 @@ def show
     @project = Project.find(params[:id])
   end
 
+  def edit
+    @project = Project.find(params[:id])
+  end
+
+  def update
+    @project = Project.find(params[:id])
+    @project.update(project_params)
+
+    if @project.save
+      redirect_to projects_url
+    else
+      render :edit
+    end
+  end
+
   def destroy
     @project = Project.find(params[:id])
     @project.destroy

app/views/projects/edit.html.erb

@@ -0,0 +1,26 @@
+<h1>Edit Project</h1>
+
+<%= form_for :project, url: @project, method: :put do |f| %>
+
+  <% if @project.errors.any? %>
+    <div class="error_messages">
+      <h2>Form is invalid</h2>
+      <ul>
+        <% for message in @project.errors.full_messages %>
+          <li><%= message %></li>
+        <% end %>
+      </ul>
+    </div>
+  <% end %>
+
+  <p>
+    <%= f.label :name %><br>
+    <%= f.text_field :name %>
+  </p>
+
+  <p>
+    <%= f.submit %>
+  </p>
+
+<% end %>
+

app/views/projects/index.html.erb

@@ -2,7 +2,7 @@
 
 <ul>
 <% @projects.each do |project| %>
-<li><%= link_to project.name, project %> | <%= link_to "Destroy", project, method: :delete %></li>
+<li><%= link_to project.name, project %> | <%= link_to "Edit", edit_project_path(project) %> | <%= link_to "Destroy", project, method: :delete %></li>
 <% end %>
 </ul>
 

app/views/projects/show.html.erb

@@ -1,5 +1,5 @@
 <h1>Project "<%= @project.name %>"</h1>
 
-<p>A nice project.</p>
+<p>A nice project. <%= link_to "Edit it!", edit_project_path %></p>
 
 <p><%= link_to 'All projects', projects_path %></p>