undefined method `each’ for nil:NilClass… why?

In your posts controller, you need to define @posts, which, based on the error you haven’t.

# app/controllers/posts_controller.rb
class PostsController < ApplicationController
  def index
    @posts = Post.all
  end
end

As @posts is not defined calling each on it will generate undefined methodeach’ for nil:NilClass`.

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