Module: Mover::ClassMethods

Defined in:
lib/mover.rb

Instance Method Summary collapse

Instance Method Details

#after_move(*to_class, &block) ⇒ Object 



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# File 'lib/mover.rb', line 17

def after_move(*to_class, &block)
  @after_move ||= []
  @after_move << [ to_class, block ]
end

#before_move(*to_class, &block) ⇒ Object 



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# File 'lib/mover.rb', line 22

def before_move(*to_class, &block)
  @before_move ||= []
  @before_move << [ to_class, block ]
end

#move_to(to_class, options = {}) ⇒ Object 



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# File 'lib/mover.rb', line 27

def move_to(to_class, options={})
  from_class = self
  
  # Conditions
  conditions = options[:conditions] || '1'
  conditions = self.sanitize_sql(conditions)
  where = "WHERE #{conditions}"
  
  # Columns
  magic = options[:magic] || 'moved_at'
  from = {
    :columns => from_class.column_names,
    :table => from_class.table_name
  }
  to = {
    :columns => to_class.column_names,
    :table => to_class.table_name
  }
  
  # insert[column] = value
  insert = (from[:columns] & to[:columns]).inject({}) do |hash, column|
    if column == magic && !options[:migrate]
      hash[column] = Time.now.utc
    else
      hash[column] = column
    end
    hash
  end
  
  # Magic column not in "from" table
  if to[:columns].include?(magic) && !from[:columns].include?(magic)
    insert[magic] = Time.now.utc
  end
  
  # Quote everything
  insert = insert.inject({}) do |hash, (column, value)|
    if value.is_a?(::Time)
      hash[connection.quote_column_name(column)] = connection.quote(value)
    else
      hash[connection.quote_column_name(column)] = connection.quote_column_name(value)
    end
    hash
  end
  
  # Callbacks
  collector = lambda do |(classes, block)|
    classes.collect! { |c| eval(c.to_s) }
    block if classes.include?(to_class) || classes.empty?
  end
  before = (@before_move || []).collect(&collector).compact
  after = (@after_move || []).collect(&collector).compact
  
  # Instances
  instances =
    if options[:instance]
      [ options[:instance] ]
    elsif before.empty? && after.empty?
      []
    else
      self.find(:all, :conditions => conditions)
    end
  options.delete(:instance)
  
  # Callback executor
  exec_callbacks = lambda do |callbacks|
    callbacks.each do |block|
      instances.each do |instance|
        instance.move_options = options
        instance.instance_eval(&block)
        instance.move_options = nil
      end
    end
  end
  
  # Execute
  transaction do
    exec_callbacks.call before
    
    if options[:quick]
      connection.execute(<<-SQL)
        INSERT INTO #{to[:table]} (#{insert.keys.join(', ')})
        SELECT #{insert.values.join(', ')}
        FROM #{from[:table]}
        #{where}
      SQL
    elsif !options[:generic] && connection.class.to_s.include?('Mysql')
      update = insert.collect do |column, value|
        if value.include?("'")
          "#{to[:table]}.#{column} = #{value}"
        else
          "#{to[:table]}.#{column} = #{from[:table]}.#{value}"
        end
      end
      
      connection.execute(<<-SQL)
        INSERT INTO #{to[:table]} (#{insert.keys.join(', ')})
        SELECT #{insert.values.join(', ')}
        FROM #{from[:table]}
        #{where}
        ON DUPLICATE KEY
        UPDATE #{update.join(', ')};
      SQL
    else
      conditions.gsub!(to[:table], 't')
      conditions.gsub!(from[:table], 'f')
      select = insert.values.collect { |i| i.include?("'") ? i : "f.#{i}" }
      set = insert.collect do |column, value|
        if value.include?("'")
          "t.#{column} = #{value}"
        else
          "t.#{column} = f.#{value}"
        end
      end
      
      connection.execute(<<-SQL)
        UPDATE #{to[:table]}
          AS t
        INNER JOIN #{from[:table]}
          AS f
        ON f.id = t.id
          AND #{conditions}
        SET #{set.join(', ')}
      SQL
  
      connection.execute(<<-SQL)
        INSERT INTO #{to[:table]} (#{insert.keys.join(', ')})
        SELECT #{select.join(', ')}
        FROM #{from[:table]}
          AS f
        LEFT OUTER JOIN #{to[:table]}
          AS t
        ON f.id = t.id
        WHERE (
          t.id IS NULL
          AND #{conditions}
        )
      SQL
    end
    
    unless options[:copy]
      connection.execute("DELETE FROM #{from[:table]} #{where}")
    end
    
    exec_callbacks.call after
  end
end

#reserve_id ⇒ Object 



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# File 'lib/mover.rb', line 174

def reserve_id
  id = nil
  transaction do
    id = connection.insert("INSERT INTO #{self.table_name} () VALUES ()")
    connection.execute("DELETE FROM #{self.table_name} WHERE id = #{id}") if id
  end
  id
end