ruby on rails - How to loop through categories posted by user in all listings -


i trying display of categories user on site has posted in. how models set up: user able create many listings. 1 many relation. listing able have multiple categories, , categories have multiple listings (there multiple listings same category). how show categories user has listed? have tried 

<% @user.listings.each.unique.categories |category| %> <li><%= category %></li> <% end %>

as 

<% @user.listings.categories |category| %> <li><%= category %></li> <% end %>

any recommendations on how can fix this?

you can directly this, if have has_many through inside user model

class user < applicationrecord   has_many :listings   has_many :categories, through: :listings end

and can 

<% @user.categories |category| %>   <li><%= category %></li> <% end %>

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