ruby on rails - Confused about the ways to write code for instance variables -


i quite confused on how write instance variables in rails. 

 posted by: <%= link_to(@item.user.username, store_path(@item.user)) %>  price: <%= number_to_currency @item.price %>

vs

subject: <%= subject_name @item %>

i curious difference between (i) subject_name @item , (ii) @item.price?

is not supposed @item.subject_name?

i expect subject_name isn't variable, method. guess have method subject_name defined in 1 of helper files takes argument - @item in example.


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