Two forms, two models, one view ROR

Question

I'm trying to make two forms for two different models in the same view.

I have a model named category and a model named post. Im trying to make a form for categories in the same view i have a form for posts. The form for posts works fine, but when i'm trying to add the form for categories i get this error: undefined method `model_name' for Category::ActiveRecord_Relation:Class

category.rb - model

has_many :posts

post.rb - model

has_many :categories

posts_controller

def index
@posts = new.Post
@categories = new.Category
end

def create
@posts = Post.create(post_params)
@posts.save
redirect_to :back
end

def create_cate
@categories = Categroy.create(categories_params)
@categroies.save
redirect_to :back
end

posts view - index.html.erb

<%= form_for(@posts) do |f| %>
<%= f.text_field :title %>
<%= f.text_area :content %>
<%= f.submit %>
<% end %>

<%= form_for(@categories) do |f| %>
<%= f.text_field :name %>
<%= f.submit %>
<% end %>

routes.rb

resources :posts
resources :categories
root 'posts#index'

I have tried to search after if, but i can only find solutions for two models, one form.

Thanks in advance. :-)

Answer 1

Since you say its in the index action:

def index
  @post = Post.new
  @category = Category.new
end

In your view:

<%= form_for(@post) do |f| %>
  <%= f.text_field :title %>
  <%= f.text_area :content %>
  <%= f.submit %>
<% end %>

<%= form_for(@category) do |f| %>
  <%= f.text_field :name %>
  <%= f.submit %>
<% end %>