Module: Houcho::Attribute

Included in:
Host, OuterRole, Role
Defined in:
lib/houcho/attribute.rb

Instance Method Summary collapse

Instance Method Details

#attr_id(attr_name) ⇒ Object

Raises:



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# File 'lib/houcho/attribute.rb', line 7

def attr_id(attr_name)
  id = @db.execute("SELECT id FROM attribute WHERE name = ?", attr_name)
  raise AttributeExceptiotn, "attribute does not exist - #{attr_name}" unless id
  id.flatten.first
end

#del_attr(target, attr_name = nil) ⇒ Object 



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# File 'lib/houcho/attribute.rb', line 81

def del_attr(target, attr_name = nil)
  before_delete = get_attr(target, attr_name)
  sql = "DELETE FROM attribute_value WHERE element_type = ? AND element_id = ?"

  @db.transaction do

  if attr_name
    sql += " AND attr_id = ?"
    @db.execute(sql, @type_id, id(target), attr_id(attr_name))
  else
    @db.execute(sql, @type_id, id(target))
  end

  end #end of transaction

  before_delete
end

#get_attr(target, attr_name = nil, json = false) ⇒ Object 



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# File 'lib/houcho/attribute.rb', line 60

def get_attr(target, attr_name = nil, json = false)
  target_id = id(target)
  return json ? "{}" : {} if target_id.nil?
  attr = {}

  id_value = @db.execute("
    SELECT attr_id, value FROM attribute_value
    WHERE element_type = ? AND element_id = ?
  ", @type_id, target_id)

  id_value.each do |iv|
    name = @db.execute("SELECT name FROM attribute WHERE id = ?", iv[0]).first.first
    attr[name.to_sym] = iv[1]
  end

  attr = attr.select { |k,v| k == attr_name.to_sym } if attr_name
  attr = JSON.generate(attr) if json
  attr
end

#get_attr_json(target, name = nil) ⇒ Object 



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# File 'lib/houcho/attribute.rb', line 55

def get_attr_json(target, name = nil)
  get_attr(target, name, true)
end

#set_attr(target, attr, force = false) ⇒ Object 



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# File 'lib/houcho/attribute.rb', line 18

def set_attr(target, attr, force = false)
  target_id = id(target)
  raise_target_does_not_exist(target) if target_id.nil?
  @db.transaction do

  attr.each do |name, attr_value|
    attr_name = name.to_s

    begin
      @db.execute("INSERT INTO attribute(name) VALUES(?)", attr_name)
    rescue SQLite3::ConstraintException, "column name is not unique"
    end

    begin
      @db.execute(
        "INSERT INTO attribute_value(attr_id, element_type, element_id, value) VALUES(?,?,?,?)",
        attr_id(attr_name),
        @type_id,
        target_id,
        attr_value
      )
    rescue SQLite3::ConstraintException, "columns attr_id, element_type, element_id are not unique"
      if force
        @db.execute("
          UPDATE attribute_value SET value = ?
          WHERE attr_id = ? AND element_type = ? AND element_id = ?
        ", attr_value, attr_id(attr_name), @type_id, target_id)
      else
        raise AttributeExceptiotn, "attribute has already defined value in #{@type} - #{attr_name}"
      end
    end
  end

  end #end of transaction
end

#set_attr!(target, attr) ⇒ Object 



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# File 'lib/houcho/attribute.rb', line 14

def set_attr!(target, attr)
  set_attr(target, attr, true)
end