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copied!<p>This might be helpful. You can define a <a href="http://api.rubyonrails.org/classes/ActionController/Base.html#M000661" rel="nofollow noreferrer"><code>default_url_options</code></a> method in your <code>ApplicationController</code> that receives a Hash of options that were passed to the url helper and returns a Hash of additional options that you want to use for those urls.</p> <p>If a post is given as a parameter to <code>post_path</code>, it will be assigned to the first (unnassigned) parameter of the route. Haven't tested it, but it might work:</p> <pre><code>def default_url_options(options = {}) if options[:controller] == "posts" && options[:year].is_a?Post post = options[:year] { :year => post.created_at.year, :month => post.created_at.month, :slug => post.slug } else {} end end </code></pre> <p>I'm in the similar situation, where a post has a language parameter and slug parameter. Writing <code>post_path(@post)</code> sends this hash to the <code>default_url_options</code> method:</p> <pre><code>{:language=>#<Post id: 1, ...>, :controller=>"posts", :action=>"show"} </code></pre> <p>UPDATE: There's a problem that you can't override url parameters from that method. The parameters passed to the url helper take precedence. So you could do something like:</p> <pre><code>post_path(:slug => @post) </code></pre> <p>and:</p> <pre><code>def default_url_options(options = {}) if options[:controller] == "posts" && options[:slug].is_a?Post { :year => options[:slug].created_at.year, :month => options[:slug].created_at.month } else {} end end </code></pre> <p>This would work if <code>Post.to_param</code> returned the slug. You would only need to add the year and month to the hash.</p>

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