foo.rb

class Foo
  METHODE_NAMES = ['problems', 'maintenances', 'journeys']
  
  class << self
    def get_var(name, hsh)
      ApiRequest.new(params: {account_id: hsh[:email], vin: hsh[:vin]},
        url: "vehicles/#{hsh[:vin]}/#{name}", verb: "get").get
    end

    METHODE_NAMES.each do name
      class_eval <<-METHODS, __FILE__, __LINE__
        def self.get_#{name}(hsh = {})
          get_var(name, hsh)
        end
    METHODS
  
  end
end

  class << self
    def get_var(name, hsh)
      ApiRequest.new(params: {account_id: hsh[:email], vin: hsh[:vin]},
        url: "vehicles/#{hsh[:vin]}/#{name}", verb: "get").get
    end
  end
  METHODS_NAMES.each do |meth|
    self.class.class_eval do
      define_method "get_#{meth}" do |hsh|
        get_var(meth, hsh)
      end
    end
  end