Module: Mcfly::Model::ClassMethods

Defined in:
lib/marty/mcfly_model.rb

Instance Method Summary collapse

Instance Method Details

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



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

def base_mcfly_lookup(name, options = {}, &block)
  delorean_options = {
    # private: options.fetch(:private, false),
    cache: options.fetch(:cache, false),
    sig: options[:sig]
  }

  delorean_fn name, delorean_options do |ts, *args|
    raise 'time cannot be nil' if ts.nil?

    # FIXME: sig is removed from delorean. We need to find a better way
    # to control amount of arguments, instead of using *splat arguments.
    max_args = Array(options[:sig]).max if options[:sig]
    if max_args && (args.size + 1) > max_args
      err = "Too many args to #{name}." \
        "(given #{args.size + 1}, expected #{max_args})"

      raise ArgumentError, err
    end

    ts = Mcfly.normalize_infinity(ts)
    q = 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, options[:private])
  end
end

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



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# File 'lib/marty/mcfly_model.rb', line 48

def cached_mcfly_lookup(name, options = {}, &block)
  base_mcfly_lookup(name, options.merge(cache: true), &block)
end

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



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# File 'lib/marty/mcfly_model.rb', line 56

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(reflect_on_all_associations.map(&:name))

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

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

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

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

  base_mcfly_lookup(name, options + { sig:  attrs.length + 1,
                                         mode: mode }) do |_t, *attr_list|
    attr_list_ids = attr_list.each_with_index.map do |_x, i|
      assoc.member?(attrs[i]) ?
        (attr_list[i] && attr_list[i].id) : attr_list[i]
    end

    q = 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 122

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({}) do |(k, v), h|
    h[k == rel_attr ? cat_attr_id : k] = v
  end

  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
  priv = options[:private]

  # cache if mode is not explicitly set to nil or cache is true
  cache = options.fetch(:cache) { options.fetch(:mode, :first) }

  delorean_options = {
    # private: options.fetch(:private, false),
    cache: cache.present?, # convert to bool
    sig: attrs.length + 1
  }

  delorean_fn name, delorean_options 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 = 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 52

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