Task create and update

app/controllers/tasks_controller.rb

@@ -4,21 +4,56 @@ class TasksController < ApplicationController
   before_action :fetch_task, only: %w[show edit update delete]
 
   def index
-    if params[:project]
-      @project = Project.find_by!(code: params[:project])
-      @tasks = @project.tasks
-    else
-      @tasks = Task.all
-    end
+    @project = fetch_project
+    @tasks = if @project
+               @project.tasks
+             else
+               Task.all
+             end
 
     @tasks = @tasks.includes(:project)
   end
 
   def show; end
 
+  def new
+    @form = Tasks::Create.new(project_id: fetch_project&.id)
+  end
+
+  def create
+    @form = Tasks::Create.new(params.expect(task: %i[project_id title description]))
+    if @form.perform
+      redirect_to tasks_path(project: @form.project)
+    else
+      render :new, status: :unprocessable_entity
+    end
+  end
+
+  def edit
+    @form = Tasks::Update.new(id: @task.id, title: @task.title, description: @task.description)
+  end
+
+  def update
+    @form = Tasks::Update.new(params.expect(task: %i[title description]))
+
+    if @form.perform(@task)
+      redirect_to task_path(@task)
+    else
+      render :edit, status: :unprocessable_entity
+    end
+  end
+
+  def delete; end
+
   private
 
+  def fetch_project
+    return nil if params[:project].blank?
+
+    Project.find_by!(code: params[:project])
+  end
+
   def fetch_task
-    @task = Task.find_by_full_number_or_id!(params[:id])
+    @task = Task.includes(:project).find_by_full_number_or_id!(params[:id])
   end
 end