Vfrdtyky

This is error I'm getting when I click on "New Post:

First argument in form cannot contain nil or be empty

My PostController:

class PostsController < ApplicationController

before_action :set_user, only: [:show, :edit, :update, :destroy]



def index

    @posts = Post.all

end



def show



end



def edit



end



def update

    @post.update(post_params)

    redirect_to posts_path

end



def new

    if user_signed_in?

        @post = Post.new

    else

        flash[:alert] = ":("

    end

end



def create

    @post = Post.new(post_params)

    @post.user_id = current_user.id

    @post.save

    redirect_to posts_path

end



def destroy

    if user_signed_in?

        @post.destroy! 

    else

        flash[:alert] = ":("

    end

    redirect_to posts_path

end





private

def post_params

    params.require(:post).permit(:body)

end



def set_user

    @post = Post.find(params[:id])

end

end

and posts#index:

<% @posts.each do |post|  %>

<%= post.body %>

<%= link_to 'Show', post %>

<%= link_to 'Edit', edit_post_path(post) %>

<%= link_to 'Delete', post, method: :delete %>

<br>

_form.html.erb

<%= form_for(@post) do |f| %>



  <div class="field">

    <%= f.label :body %><br>

    <%= f.text_area :body %>

  </div>

  <div class="actions">

    <%= f.submit %>

  </div>

<% end %>

you should check your "new.html.erb" or "_form.html.erb" file. to see if the "form_for" method is correctly called.

If you are using devise, You can get this by adding a before action:

before_action :authenticate_user!, only: [:new]

and you new action as:

def new

  @post = Post.new

end