Module: Offroad::ModelExtensions::CommonInstanceMethods

Defined in:
lib/model_extensions.rb

Instance Method Summary collapse

Instance Method Details

#validate_changed_id_columns ⇒ Object

:nodoc:#



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# File 'lib/model_extensions.rb', line 146

def validate_changed_id_columns
  changes.each do |colname, arr|
    orig_val = arr[0]
    new_val = arr[1]
    
    raise DataError.new("Cannot change id of offroad-tracked records (orig #{orig_val.inspect}, new #{new_val.inspect}") if colname == self.class.primary_key && orig_val != nil
    
    # FIXME : Use association reflection instead
    next unless colname.end_with? "_id"
    accessor_name = colname[0, colname.size-3]
    next unless respond_to? accessor_name
    obj = send(accessor_name)
    next unless obj
    
    raise DataError.new("Mirrored data cannot hold a foreign key to unmirrored data") unless obj.class.acts_as_offroadable?
    
    if !new_record? and offroad_mode == :group_owned and colname == offroad_parent_assoc.primary_key_name
      # obj is our parent
      # FIXME: What if we can't find orig_val?
      if obj.owning_group != obj.class.find(orig_val).owning_group
        raise DataError.new("Group-owned data cannot be transferred between groups")
      end
    end

    if self.class.offroad_group_data?
      if obj.class.offroad_group_data? && obj.owning_group && obj.owning_group.id != owning_group.id
        raise DataError.new("Invalid #{colname}: Group data cannot hold a foreign key to data owned by another group")
      end
    elsif self.class.offroad_global_data?
      unless obj.class.offroad_global_data?
        raise DataError.new("Invalid #{colname}: Global mirrored data cannot hold a foreign key to group data")
      end
    end
  end
end