Module: Netzke::DataMapper::RelationExtensions

Defined in:
lib/netzke/data_mapper/relation_extensions.rb

Instance Method Summary collapse

Instance Method Details

#extend_with(*params) ⇒ Object 



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# File 'lib/netzke/data_mapper/relation_extensions.rb', line 5

def extend_with(*params)
  scope = params.shift
  case scope.class.name
  when "Symbol" # model's scope
    # In DataMapper case this is just a method
    self.send(scope, *params)
  when "String" # SQL query or SQL query with params (e.g. ["created_at < ?", 1.day.ago])
    raise NotImplementedError.new("This method is unsupported, as DM doen't allow to extend relations with SQL")
  when "Array"
    self.extend_with(*scope)
  when "Hash"  # conditions hash
    self.all(scope)
  when "ActiveSupport::HashWithIndifferentAccess" # conditions hash
    self.all(scope)
  when "Proc"   # receives a relation, must return a relation
    scope.call(self)
  else
    raise ArgumentError, "Wrong parameter type for ActiveRecord::Relation#extend_with"
  end
end

#extend_with_netzke_conditions(cond) ⇒ Object

Non-destructively extends itself whith a hash of double-underscore’d conditions, where the last part “__” is MetaWhere operator (which is required), e.g.:

{:role__name__like => "%admin"}



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# File 'lib/netzke/data_mapper/relation_extensions.rb', line 29

def extend_with_netzke_conditions(cond)
  cond.each_pair.inject(self) do |r, (k,v)|
    assoc, method, *operator = k.to_s.split("__")
    operator.empty? ? r.where(assoc.to_sym.send(method) => v) : r.where(assoc.to_sym => {method.to_sym.send(operator.last) => v}).joins(assoc.to_sym)
  end
end