undefined method `stringify_keys' for "/posts/7/up-vote":String - ruby-on-rails

Question

I am getting this error:
NoMethodError - undefined method `stringify_keys' for "/posts/7/up-vote":String:
This is my code:
<% if policy(Vote.new).create? %>
<div class="vote-arrows pull-left">
<div if vote = current_user.vote(post) %>
<%= link_to [post, Vote.new], post_up_vote_path(post), class: 'btn btn-primary', method: :up_vote do %>
<i class = "glyphicon glyphicon-chevron-up #{(current_user.voted(post) && current_user.voted(post).up_vote?) ? 'voted' : '' }" ></i> Upvote
<strong><%= post.points %></strong>
<% end %>
<% else %>
<%= link_to [post, vote], post_down_vote_path(post), class: 'btn btn-danger', method: :down_vote do %> <i class = "glyphicon glyphicon-chevron-down #{(current_user.voted(post) && current_user.voted(post).down_vote?) ? 'voted' : '' }"></i>;nbsp; Downvote
<% end %>
</div>
<% end %>
I am getting the error on this line:
<%= link_to [post, Vote.new], post_up_vote_path(post), class: 'btn btn-primary', method: :up_vote do %>
<i class = "glyphicon glyphicon-chevron-up #{(current_user.voted(post) && current_user.voted(post).up_vote?) ? 'voted' : '' }" ></i> Upvote
Any help would be greatly appreciated...

Answer 1

Try going through the code you've posted line-by-line and look for errors. Here's some to check for:
<!-- Mixing HTML and Ruby on this line -->
<div if vote = current_user.vote(post) %>
The link_to links need some love. Read the docs carefully and note in particular:
Valid HTTP verb values for :method
The path only needs to be specified once
link_to docs here: http://api.rubyonrails.org/classes/ActionView/Helpers/UrlHelper.html#method-i-link_to
You may want to spend some time getting the indentation right for the if/else/ends as this will make it easier for you to spot syntax errors.

Answer 2

The format of a link_to call is:
link_to "The text in the link", the_path, hash_of_options
That the first argument must be text is what Sergio meant by "link_to must accept label as its first parameter". So, something like:
<%= link_to "Up-vote the post" , post_up_vote_path(post), class: 'btn btn-primary', method: :up_vote do %>
You're giving it a path (or an array that could be converted to a path) as both main arguments.
Check out the docs for the method: http://api.rubyonrails.org/classes/ActionView/Helpers/UrlHelper.html#method-i-link_to
Note that your link contains an icon, which should probably take the place of the "label", so your label could just be an empty string.