Connect Projects and Todos

Author: Christopher Power

app/controllers/todos_controller.rb

@@ -65,6 +65,6 @@ def set_todo
 
     # Only allow a list of trusted parameters through.
     def todo_params
-      params.expect(todo: [ :name, :description ])
+      params.expect(todo: [ :name, :description, :completed, :priority, :project_id ])
     end
 end

app/models/project.rb

@@ -1,3 +1,4 @@
 class Project < ApplicationRecord
+  has_many :todos, dependent: :destroy
   validates :name, presence: { message: "Was forgotten?" }
 end

app/models/todo.rb

@@ -1,2 +1,3 @@
 class Todo < ApplicationRecord
+  belongs_to :project
 end

app/views/projects/show.html.erb

@@ -1,4 +1,15 @@
 <h1><%= @project.name %></h1>
 <p>Project details coming soon...</p>
 
+<h2>Todos for this project</h2>
+
+<ul>
+  <% @project.todos.each do |todo| %>
+    <li>
+      <%= link_to todo.name, todo_path(todo) %>
+      <% if todo.completed %> ✅ <% end %>
+    </li>
+  <% end %>
+</ul>
+
 <%= button_to "Delete Project", project_path(@project), method: :delete %>

app/views/todos/_form.html.erb

@@ -21,6 +21,15 @@
     <%= form.textarea :description %>
   </div>
 
+  <%= form.label :completed %>
+  <%= form.check_box :completed %>
+
+  <%= form.label :priority %>
+  <%= form.number_field :priority %>
+
+  <%= form.label :project_id %>
+  <%= form.collection_select :project_id, Project.all, :id, :name, prompt: "Select a project" %>
+
   <div>
     <%= form.submit %>
   </div>

app/views/todos/_todo.html.erb

@@ -9,4 +9,5 @@
     <%= todo.description %>
   </p>
 
+  <%= link_to todo.project.name, project_path(todo.project) if todo.project %>
 </div>

db/migrate/20250712052009_add_project_id_to_todos.rb

@@ -0,0 +1,5 @@
+class AddProjectIdToTodos < ActiveRecord::Migration[8.0]
+  def change
+    add_reference :todos, :project, null: false, foreign_key: true
+  end
+end