Link to all posts with same tag, using acts_as_taggable

Question

So I have acts_as_taggable working properly. I am able to add the tags when creating a new post and I can see all the tags when looking at the posts. What Im trying to do is create a nav link for certain tags. For instance I want a nav link that says "Movies" and when I click that link I want all the posts that I have created that have the tag "Movies" to show. This is my post_controller.rb

def index
  @posts = current_author.posts.most_recent
end

def show
end

def new
  @post = current_author.posts.new
end

private
  def set_post
    @post = current_author.posts.friendly.find(params[:id])
  end

  def post_params
    params.require(:post).permit(:title, :body, :description, :banner_image_url, :tag_list)
  end
end

end

My post.rb that deals with the tags

acts_as_taggable # Alias for acts_as_taggable_on :tags

extend FriendlyId
friendly_id :title, use: :slugged

belongs_to :author


scope :most_recent, -> { order(published_at: :desc) }
scope :published, -> { where(published: true) }
scope :with_tag, -> (tag) { tagged_with(tag) if tag.present? }

scope :list_for, -> (page, tag) do
 recent_paginated(page).with_tag(tag)
end

Answer 1

You can create a custom route which the nav button can link to.

<%= link_to "Movies, tagged_posts_path("Movies") %>

In posts_controller, create a method for the custom route. The custom route can use the 'with_tag' scope to return only posts tagged with 'Movies' to your view.

def tagged
  @posts = Post.with_tag(params[:tag])
end

Make sure you add the new custom route to the routes file.

resources :posts do
  collection do
    get "/tagged/:tag", to: "posts#tagged", as: "tagged"
  end
end