ruby on rails - How to query two tables from database in one controller -

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i have 2 tables 1 many (1 challenge many entry) want last entry challenges want title of challenge last entry.

so far have:

 def index     @discovers = challenge.all.map{|c| c.entries.last}  end

how add fact want challenge.title?

 def index     @challenges = challenge.all  end

then inside view

<% @challenges.each |challenge| %>   <%= challenge.title %> #  give challenge title   <%= challenge.entries.last %> # give last entry challnge <% end %>

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