Rails: how to create a list with conditional links - ruby-on-rails

Question

I am working on a RAILS application where I create a view which lists all available resources of a given model species.rb.
The view partial is:
<% i= #s
for species in #species %>
<%= species.name %>, <%= species.author.surname %> <%= species.author.initial_name %>
<% i -= 1
end %>
Some of the resources species have an related article, others have only the name. I would like to loop through the partial and add a link only to the entries which have an associated article.
Something like: add link if species.article is present else just put species.name without link + loop through it for all entries.
How can I do this?
UPDATE:
Thanks to #jvillian and #fool-dev I was able to progress. In my case I wanted to add a link if the resource has a description in a description row of its table.
<% #species.each do |species| %>
<div class="entry">
<p><i><%= link_to_if(species.txtlandscape.present?, "#{species.name}, #{species.author.surname}, #{species.author.initial_name}. 2014", :controller => 'projects', :action => 'show', :id => species) %></i></p>
</div>
<% end %>
Now that a link is added I was wondering if it can be used to load a partial to a target such as in, where ArticleRequest is a JS function I have:
<% # species.each do | species | %>
<div id="species-<%= species.id %>" class="species-entry">
<a onClick="ArticleRequest('/species/show/<%= species.id %>', 'species-<%= species.id %>');">
<p><%= species.name %></p>
</a>
</div>
<% end %>
Until I find a way to do this with link_to_if, I will use something like:
<% for species in #species %>
<% if species.txtlandscape.present? %>
<a onClick="ArticleRequest('/species/show/<%= species.id %>', 'species-<%= species.id %>');">
<p><%= species.name %>, <%= species.author.surname %> <%= species.author.initial_name %></p>
</a>
<% else %>
<p><%= species.name %>, <%= species.author.surname %> <%= species.author.initial_name %></p>
<% end %>
<% end %>

Answer 1

According to the docs, it seems you should be able to do:
<% #species.each do |specie| %>
<%= link_to_if(specie.article, specie.name, specie_article_path(specie.article)) %>
<% end %>
I made the path name up, you'll have to make that match your actual routes.
BTW, this:
for species in #species
Is super non-idiomatic.

Answer 2

You can do this, see the below
<% for species in #species %>
<% if species.article.present? %> #=> I thin it will be articles because table name is articles, anyway, you know better
<%= link_to species.name, link_path(species.article) %>, #=> on the link_path it will be your proper link just replace this
<% else %>
<%= species.name %>,
<% end %>
<%= species.author.surname %> <%= species.author.initial_name %>
<% end %>
You can do this with Rails each method like below
<% #species.each do |species| %>
<% if species.article.present? %> #=> I thin it will be articles because table name is articles, anyway, you know better
<%= link_to species.name, link_path(species.article) %>, #=> on the link_path it will be your proper link just replace this
<% else %>
<%= species.name %>,
<% end %>
<%= species.author.surname %> <%= species.author.initial_name %>
<% end %>
Or you can use link_to_if it is also most easier to understand
<% #species.each do |species| %>
<%= link_to_if(species.article.present?, "#{species.name},", link_path(species.article)) %>
<%= species.author.surname %> <%= species.author.initial_name %>
<% end %>
Hope it will help.