Module: Sinja::Sequel::Helpers

Defined in:
lib/sinja/sequel/helpers.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/sinja/sequel/helpers.rb', line 7

def self.included(base)
  base.prepend(Core)
end

Instance Method Details

#add_missing(*args, &block) ⇒ Object 



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# File 'lib/sinja/sequel/helpers.rb', line 51

def add_missing(*args, &block)
  add_or_remove(:add, :-, *args, &block)
end

#add_remove(association, rios, try_convert = :to_i, **filters, &block) ⇒ Object 



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# File 'lib/sinja/sequel/helpers.rb', line 15

def add_remove(association, rios, try_convert=:to_i, **filters, &block)
  meth_suffix = association.to_s.singularize
  add_meth = "add_#{meth_suffix}".to_sym
  remove_meth = "remove_#{meth_suffix}".to_sym

  if block
    filters[:add] ||= block
    filters[:remove] ||= block
  end

  dataset = resource.send("#{association}_dataset")
  klass = dataset.association_reflection.associated_class

  # does not / will not work with composite primary keys
  new_ids = rios.map { |rio| proc(&try_convert).(rio[:id]) }
  transaction do
    resource.lock!
    old_ids = dataset.select_map(klass.primary_key)
    ids_in_common = old_ids & new_ids

    (new_ids - ids_in_common).each do |id|
      subresource = klass.with_pk!(id)
      next if filters[:add] && !filters[:add].(subresource)
      resource.send(add_meth, subresource)
    end

    (old_ids - ids_in_common).each do |id|
      subresource = klass.with_pk!(id)
      next if filters[:remove] && !filters[:remove].(subresource)
      resource.send(remove_meth, subresource)
    end

    resource.reload
  end
end

#next_pk(resource, opts = {}) ⇒ Object 



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# File 'lib/sinja/sequel/helpers.rb', line 11

def next_pk(resource, opts={})
  [resource.pk, resource, opts]
end

#remove_present(*args, &block) ⇒ Object 



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# File 'lib/sinja/sequel/helpers.rb', line 55

def remove_present(*args, &block)
  add_or_remove(:remove, :&, *args, &block)
end