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page_controller.ex
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page_controller.ex
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defmodule HelloWeb.CMS.PageController do
use HelloWeb, :controller
alias Hello.CMS
alias Hello.CMS.Page
plug :require_existing_author
plug :authorize_page when action in [:edit, :update, :delete]
def index(conn, _params) do
pages = CMS.list_pages()
render(conn, "index.html", pages: pages)
end
def new(conn, _params) do
changeset = CMS.change_page(%Page{})
render(conn, "new.html", changeset: changeset)
end
def create(conn, %{"page" => page_params}) do
case CMS.create_page(conn.assigns.current_author, page_params) do
{:ok, page} ->
conn
|> put_flash(:info, "Page created successfully.")
|> redirect(to: cms_page_path(conn, :show, page))
{:error, %Ecto.Changeset{} = changeset} ->
render(conn, "new.html", changeset: changeset)
end
end
def show(conn, %{"id" => id}) do
page =
id
|> CMS.get_page!()
|> CMS.inc_page_views()
render(conn, "show.html", page: page)
end
def edit(conn, _) do
changeset = CMS.change_page(conn.assigns.page)
render(conn, "edit.html", changeset: changeset)
end
def update(conn, %{"page" => page_params}) do
case CMS.update_page(conn.assigns.page, page_params) do
{:ok, page} ->
conn
|> put_flash(:info, "Page updated successfully.")
|> redirect(to: cms_page_path(conn, :show, page))
{:error, %Ecto.Changeset{} = changeset} ->
render(conn, "edit.html", changeset: changeset)
end
end
def delete(conn, _) do
{:ok, _page} = CMS.delete_page(conn.assigns.page)
conn
|> put_flash(:info, "Page deleted successfully.")
|> redirect(to: cms_page_path(conn, :index))
end
# Plugs
defp require_existing_author(conn, _) do
author = CMS.ensure_author_exists(conn.assigns.current_user)
assign(conn, :current_author, author)
end
defp authorize_page(conn, _) do
page = CMS.get_page!(conn.params["id"])
if conn.assigns.current_author.id == page.author_id do
assign(conn, :page, page)
else
conn
|> put_flash(:error, "You can't modify that page")
|> redirect(to: cms_page_path(conn, :index))
|> halt()
end
end
end