How to show last granted badges

You will need to override Merit::BadgesSash model adding a last_granted method.

NOTE: if you use merit version >= 4, the superclass name has changed to work with zeitwerk. See https://github.com/merit-gem/merit/issues/343.

For doing so, you can create config/initializers/merit_badges_sash_override.rb with following contents:

module Merit
  class BadgesSash
    def self.last_granted(options = {})
      options[:since_date] ||= 1.month.ago
      options[:limit]      ||= 10
      where("created_at > '#{options[:since_date]}'")
        .limit(options[:limit])
        .map(&:user_badge)
    end

    def user_badge
      {
        user: User.find_by_sash_id(sash_id),
        badge: Badge.find(badge_id)
      }
    end
  end
end

You could use it like:

# List 10 badge grants in the last month
Merit::BadgesSash.last_granted
# [{:user=>
#    #<User id: 1, name: "the-commenter-guy", created_at: "2014-01-13 15:08:45", updated_at: "2014-01-13 15:45:19", sash_id: 1, level: 0>,
#   :badge=>
#    #<Merit::Badge id: 9, name: "gossip", level: nil, image: nil, description: nil, custom_fields: nil>},
#  {:user=>
#    #<User id: 1, name: "the-commenter-guy", created_at: "2014-01-13 15:08:45", updated_at: "2014-01-13 15:45:19", sash_id: 1, level: 0>,
#   :badge=>
#    #<Merit::Badge id: 8, name: "wildcard_badge", level: nil, image: nil, description: nil, custom_fields: nil>},
#  {:user=>
#    #<User id: 1, name: "the-commenter-guy", created_at: "2014-01-13 15:08:45", updated_at: "2014-01-13 15:45:19", sash_id: 1, level: 0>,
#   :badge=>
#    #<Merit::Badge id: 9, name: "gossip", level: nil, image: nil, description: nil, custom_fields: nil>},
#  {:user=>
#    #<User id: 1, name: "the-commenter-guy", created_at: "2014-01-13 15:08:45", updated_at: "2014-01-13 15:45:19", sash_id: 1, level: 0>,
#   :badge=>
#    #<Merit::Badge id: 8, name: "wildcard_badge", level: nil, image: nil, description: nil, custom_fields: nil>}]

# List 3 badge grants in the last week
Merit::BadgesSash.last_granted(since_date: 1.week.ago, limit: 3)
# [{:user=>
#    #<User id: 1, name: "the-commenter-guy", created_at: "2014-01-13 15:08:45", updated_at: "2014-01-13 15:45:19", sash_id: 1, level: 0>,
#   :badge=>
#    #<Merit::Badge id: 9, name: "gossip", level: nil, image: nil, description: nil, custom_fields: nil>},
#  {:user=>
#    #<User id: 1, name: "the-commenter-guy", created_at: "2014-01-13 15:08:45", updated_at: "2014-01-13 15:45:19", sash_id: 1, level: 0>,
#   :badge=>
#    #<Merit::Badge id: 8, name: "wildcard_badge", level: nil, image: nil, description: nil, custom_fields: nil>},
#  {:user=>
#    #<User id: 1, name: "the-commenter-guy", created_at: "2014-01-13 15:08:45", updated_at: "2014-01-13 15:45:19", sash_id: 1, level: 0>,
#   :badge=>
#    #<Merit::Badge id: 9, name: "gossip", level: nil, image: nil, description: nil, custom_fields: nil>}]