Module: MongoMapper::Plugins::Tree::ClassMethods

Defined in:
lib/mongo_mapper/plugins/tree.rb

Instance Method Summary collapse

Instance Method Details

#ancestor_tree_keys(nv, dv) ⇒ Object

returns ancestor nv, dv, snv, sdv values as hash



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# File 'lib/mongo_mapper/plugins/tree.rb', line 37

def ancestor_tree_keys(nv,dv)
  numerator = nv
  denominator = dv
  ancnv = 0
  ancdv = 1
  ancsnv = 1
  ancsdv = 0
  rethash = {:nv => ancnv, :dv => ancdv, :snv => ancsnv, :sdv => ancsdv}
  # make sure we break if we get root values! (numerator == 0 + denominator == 0)
  #max_levels = 10
  while ((ancnv < nv) && (ancdv < dv)) && ((numerator > 0) && (denominator > 0))# && (max_levels > 0)
    #max_levels -= 1
    div = numerator / denominator
    mod = numerator % denominator
    # set return values to previous values, as they are the parent values
    rethash = {:nv => ancnv, :dv => ancdv, :snv => ancsnv, :sdv => ancsdv}

    ancnv = ancnv + (div * ancsnv)
    ancdv = ancdv + (div * ancsdv)
    ancsnv = ancnv + ancsnv
    ancsdv = ancdv + ancsdv

    numerator = mod
    if (numerator != 0)
      denominator = denominator % mod
      if denominator == 0
        denominator = 1
      end
    end
  end
  return rethash
end

#compare_keys(key1, key2) ⇒ Object 



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# File 'lib/mongo_mapper/plugins/tree.rb', line 77

def compare_keys(key1, key2)
( (key1[:nv] === key2[:nv]) and
  (key1[:dv] === key2[:dv]) and
  (key1[:snv] === key2[:snv]) and
  (key1[:sdv] === key2[:sdv]))
end

#keys_from_parent_keys_and_position(parent_keys, position) ⇒ Object

get_ancestor_keys(nv,dv)



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# File 'lib/mongo_mapper/plugins/tree.rb', line 70

def keys_from_parent_keys_and_position(parent_keys, position)
  { :nv => parent_keys[:nv] + (position * parent_keys[:snv]),
    :dv => parent_keys[:dv] + (position * parent_keys[:sdv]),
    :snv => parent_keys[:nv] + ((position + 1) * parent_keys[:snv]),
    :sdv => parent_keys[:dv] + ((position + 1) * parent_keys[:sdv]) }
end

#position_from_nv_dv(nv, dv) ⇒ Object 



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# File 'lib/mongo_mapper/plugins/tree.rb', line 31

def position_from_nv_dv(nv, dv)
  anc_tree_keys = ancestor_tree_keys(nv, dv)
  (nv - anc_tree_keys[:nv]) / anc_tree_keys[:snv]
end

#rekey_all! ⇒ Object

force all keys to update



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# File 'lib/mongo_mapper/plugins/tree.rb', line 16

def rekey_all!
  # rekey keys for each root. will do children 
  _pos = 1
  self.roots.each do |root|
    new_keys = keys_from_parent_keys_and_position({:nv => 0, :dv => 1, :snv => 1, :sdv => 0}, _pos)
    if !compare_keys(root.tree_keys(), new_keys)
      root.move_nv_dv(new_keys[:nv], new_keys[:dv], {:ignore_conflict => true})
      root.save!
      root.reload
    end
    root.rekey_children
    _pos += 1
  end
end

#roots ⇒ Object 



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# File 'lib/mongo_mapper/plugins/tree.rb', line 11

def roots
  self.where(tree_parent_id_field => nil).sort(tree_sort_order()).all
end

#tree_sort_order ⇒ Object 



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# File 'lib/mongo_mapper/plugins/tree.rb', line 84

def tree_sort_order
  if !tree_use_rational_numbers
    "#{tree_order} #{tree_info_depth_field}" 
  else
    tree_info_nv_div_dv_field.asc
  end
end