discourse/lib/avatar_lookup.rb

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class AvatarLookup
def initialize(user_ids=[])
@user_ids = user_ids.tap(&:compact!).tap(&:uniq!).tap(&:flatten!)
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end
# Lookup a user by id
def [](user_id)
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users[user_id]
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end
private
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def users
@users ||= User.where(:id => @user_ids).select([:id, :email, :username]).inject({}) do |hash, user|
hash.merge({user.id => user})
end
end
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end