Module: Mcfly::Model::ClassMethods

Defined in:
lib/marty/mcfly_model.rb

Instance Method Summary collapse

Instance Method Details

#base_mcfly_lookup(meth, name, options = {}, &block) ⇒ Object 



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# File 'lib/marty/mcfly_model.rb', line 13

def base_mcfly_lookup(meth, name, options = {}, &block)

  priv = options[:private]

  send(meth, name, options) do |ts, *args|
    raise "time cannot be nil" if ts.nil?

    ts = Mcfly.normalize_infinity(ts)
    q = self.where("#{table_name}.obsoleted_dt >= ? AND " +
               "#{table_name}.created_dt < ?", ts, ts).scoping do
      block.call(ts, *args)
    end

    fa = get_final_attrs
    q = q.select(*fa) if fa.present? && q.is_a?(ActiveRecord::Relation)

    q = q.first if q.respond_to?(:first) && options[:mode] == :first

    hash_if_necessary(q, priv)
  end
end

#cached_mcfly_lookup(name, options = {}, &block) ⇒ Object 



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# File 'lib/marty/mcfly_model.rb', line 35

def cached_mcfly_lookup(name, options = {}, &block)
  base_mcfly_lookup(:cached_delorean_fn, name, options, &block)
end

#gen_mcfly_lookup(name, attrs, options = {}) ⇒ Object 



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# File 'lib/marty/mcfly_model.rb', line 43

def gen_mcfly_lookup(name, attrs, options={})
  raise "bad options #{options.keys}" unless
    (options.keys - [:mode, :cache, :private]).empty?

  mode = options.fetch(:mode, :first)

  # if mode is nil, don't cache -- i.e. don't cache AR queries
  cache = mode && options[:cache]

  # the older mode=:all is not supported (it's bogus)
  raise "bad mode #{mode}" unless [nil, :first].member?(mode)

  assoc = Set.new(self.reflect_on_all_associations.map(&:name))

  qstr = attrs.map {|k, v|
    k = "#{k}_id" if assoc.member?(k)

    v ? "(#{k} = ? OR #{k} IS NULL)" : "(#{k} = ?)"
  }.join(" AND ")

  if Hash === attrs
    order = attrs.select {|k, v| v}.keys.reverse.map { |k|
      k = "#{k}_id" if assoc.member?(k)

      "#{k} NULLS LAST"
    }.join(", ")
    attrs = attrs.keys
  else
    raise "bad attrs" unless Array === attrs
  end

  fn = cache ? :cached_delorean_fn : :delorean_fn
  base_mcfly_lookup(fn, name, options + {sig:  attrs.length+1,
                                         mode: mode}) do
    |t, *attr_list|

    attr_list_ids = attr_list.each_with_index.map {|x, i|
      assoc.member?(attrs[i]) ?
        (attr_list[i] && attr_list[i].id) : attr_list[i]
    }

    q = self.where(qstr, *attr_list_ids)
    q = q.order(order) if order
    q
  end
end

#gen_mcfly_lookup_cat(name, catrel, attrs, options = {}) ⇒ Object

rel_attr = :security_instrument cat_assoc_klass = Gemini::SecurityInstrumentCategorization cat_attr = :g_fee_category name = :lookup_q pc_name = :pc_lookup_q pc_attrs = true, security_instrument: true, coupon: true



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# File 'lib/marty/mcfly_model.rb', line 112

def gen_mcfly_lookup_cat(name, catrel, attrs, options={})
  rel_attr, cat_assoc_name, cat_attr = catrel

  raise "#{rel_attr} should be mapped in attrs" if attrs[rel_attr].nil?

  cat_assoc_klass = cat_assoc_name.constantize
  cat_attr_id = "#{cat_attr}_id"

  # replace rel_attr with cat_attr in attrs
  pc_attrs = attrs.each_with_object({}) {|(k, v), h|
    h[k == rel_attr ? cat_attr_id : k] = v
  }

  pc_name = "pc_#{name}".to_sym

  gen_mcfly_lookup(pc_name, pc_attrs, options + {private: true})

  lpi = attrs.keys.index rel_attr

  raise "should not include #{cat_attr}" if attrs.member?(cat_attr)
  raise "need #{rel_attr} argument" unless lpi

  # cache if mode is not nil
  fn = options.fetch(:mode, :first) ? :cached_delorean_fn : :delorean_fn
  priv = options[:private]

  send(fn, name, sig: attrs.length+1) do
    |ts, *args|

    # Example: rel is a Gemini::SecurityInstrument instance.
    rel = args[lpi]
    raise "#{rel_attr} can't be nil" unless rel

    args[lpi] = cat_assoc_klass.
                  mcfly_pt(ts).
                  select(cat_attr_id).
                  find_by(rel_attr => rel).
                  send(cat_attr_id)

    q = self.send(pc_name, ts, *args)
    hash_if_necessary(q, priv)
  end
end

#hash_if_necessary(q, private) ⇒ Object 



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# File 'lib/marty/mcfly_model.rb', line 9

def hash_if_necessary(q, private)
  !private && q.is_a?(ActiveRecord::Base) ? make_openstruct(q) : q
end

#mcfly_lookup(name, options = {}, &block) ⇒ Object 



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# File 'lib/marty/mcfly_model.rb', line 39

def mcfly_lookup(name, options = {}, &block)
  base_mcfly_lookup(:delorean_fn, name, options, &block)
end