Second Commit

app/controllers/admin/books_controller.rb

@@ -0,0 +1,58 @@
+class Admin::BooksController < ApplicationController
+  before_action :authenticate_user!
+  before_action :authorized_user!
+
+  def index
+    @books = Book.all.order(created_at: :desc).page params[:page]
+  end
+
+  def new
+    @book = Book.new
+  end
+
+  def create
+    @book = Book.new(book_params)
+    if @book.save
+      flash[:notice] = 'Book created successfully.'
+      redirect_to admin_books_path
+    else
+      flash[:alert] = @book.errors.full_messages.join(', ')
+      render :new
+    end
+  end
+
+  def edit
+    @book = Book.find(params[:id])
+  end
+
+  def update
+    @book = Book.find(params[:id])
+    if @book.update(book_params)
+      flash[:notice] = 'Book updated successfully.'
+      redirect_to admin_books_path
+    else
+      flash[:alert] = @book.errors.full_messages.join(', ')
+      render :edit
+    end
+  end
+
+  def destroy
+    @book = Book.find(params[:id])
+    if @book.destroy
+      flash[:notice] = 'Book removed successfully.'
+    else
+      flash[:alert] = @book.errors.full_messages.join(', ')
+    end
+    redirect_to admin_books_path
+  end
+
+  def show
+    @book = Book.find(params[:id])
+  end
+
+  private
+
+  def book_params
+    params.require(:book).permit(:title, :author, :genre, :sub_genre, :pages, :copies)
+  end
+end