I am trying to implement my new.html.eex file to create new posts on my website.

new.html.eex:

<h1>Create Post</h1>
<%= form_for @changeset, post_path(@conn, :create, @current_user.id), fn f -> %>
  <%= if @changeset.action do %>
    <div class="alert alert-danger">
      <p>There are some errors</p>
    </div>
  <% end %>
  <div class="form-group">
    <%= text_input f, :title, placeholder: "Title",
                              class: "form-control" %>
    <%= error_tag f, :title %>
  </div>
  <div class="form-group">
    <%= textarea f, :body, placeholder: "Body", class: "form-control" %>
    <%= error_tag f, :body %>
  </div>
  <%= submit "Create post", class: "btn btn-primary" %>
<% end %>

new and create methods in post_controller.ex:

  def new(conn, _params, current_user) do
    changeset =
    current_user
    |> Ecto.build_assoc(:posts)
    |> Post.changeset
    render conn, "new.html", changeset: changeset
  end

  def create(conn, %{"post" => post_params}, current_user) do
    changeset =
    current_user
    |> Ecto.build_assoc(:posts)
    |> Post.changeset(post_params)
    case Repo.insert(changeset) do
      {:ok, _} ->
        conn
        |> put_flash(:info, "Post was created successfully")
        |> redirect(to: post_path(conn, :index, current_user.id))
        {:error, changeset} ->
          render(conn, "new.html", changeset: changeset)
    end
  end

But I can’t access the template. I get the following error:

protocol Enumerable not implemented for 1. This protocol is implemented for: DBConnection.PrepareStream, DBConnection.Stream, Date.Range, Ecto.Adapters.SQL.Stream, File.Stream, Function, GenEvent.Stream, HashDict, HashSet, IO.Stream, List, Map, MapSet, Postgrex.Stream, Range, Stream

Things seems to get wrong in the router, so here is my router.ex:

defmodule GazetteWeb.Router do
  use GazetteWeb, :router

  pipeline :browser do
    plug :accepts, ["html"]
    plug :fetch_session
    plug :fetch_flash
    plug :protect_from_forgery
    plug :put_secure_browser_headers
  end

  pipeline :api do
    plug :accepts, ["json"]
  end

  pipeline :with_session do #if a user is signed in
    plug Guardian.Plug.VerifySession
    plug Guardian.Plug.LoadResource
    plug Gazette.CurrentUser
  end

  pipeline :admin_required do
    plug Gazette.CheckAdmin
  end

  pipeline :login_required do

  end

  scope "/posts", GazetteWeb do
    pipe_through [:browser, :with_session, :admin_required]
    resources "/", PostController, except: [:index, :show]
  end

  scope "/", GazetteWeb do
    pipe_through [:browser, :with_session]

    get "/", PageController, :index

    resources "/users", UserController, only: [:show, :new, :create]
    resources "/sessions", SessionController, only: [:new, :create, :delete]
    resources "/posts", PostController, only: [:index, :show]
  end


  # Other scopes may use custom stacks.
  # scope "/api", GazetteWeb do
  #   pipe_through :api
  # end
end

any Idea ?