if statement - Rails - Trouble with setting var and getting value on layout -

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i'm having newb moment, trying find right (rails) way set variable on show.html.erb , value on layout.

in show.html.erb setting var so:

<% @meta_title = @content.meta_title %>

in layout, want set <title> if defined , has length, otherwise want use default site setting (loaded config.yml).

in /views/layouts/public.html.erb

 <%= @meta_title ? @meta_title : app_config[:site][:title] %>

i've tried many variations can't seem nail conditions down, things this:

<%= !@meta_title.blank? ? @meta_title : app_config[:site][:title] %> <%= !@meta_title.nil? || meta_title.length? ? @meta_title : app_config[:site][:title] %>

this should easier me have difficulty w/ if, unless statements. can lend hand? thanks!

layouts cannot variables show templates , there no reason on show action since want in layout.

in application_helper.rb:

def meta_title(title)     if title         title     else          title_constant          #or add text here such "my home page"     end end

then in layout:

<%= meta_title(@meta_title) %>

this give default of instance variable if there one. don't forget set constant in config/initializers/constants.rb or use text in helper.


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