Render 'complete' button only if the task's status is not 'done'.

app/controllers/tasks_controller.rb

@@ -18,19 +18,28 @@ class TasksController < ApplicationController
   end
 
   def destroy
-    @task = @project.tasks.find(params[:id])
+    @task = @project.tasks.find_by(id: params[:id])
+    return unless @task
+
+    task_dom_id = "task_#{@task.id}"
     @task.destroy
+
+    respond_to do |format|
+      format.turbo_stream { render turbo_stream: turbo_stream.remove(task_dom_id) }
+      format.html { redirect_to @project }
+    end
   end
 
+
   def complete
-  @task = @project.tasks.find(params[:id])
-  @task.update(status: "done")
+    @task = @project.tasks.find(params[:id])
+    @task.update(status: "done")
 
-  respond_to do |format|
-    format.turbo_stream
-    format.html { redirect_to @project }
+    respond_to do |format|
+      format.turbo_stream
+      format.html { redirect_to @project }
+    end
   end
-end
 
   private