Class: DataMapper::Adapters::Sql::Commands::DeleteCommand

Inherits:
Object
  • Object
show all
Defined in:
lib/data_mapper/adapters/sql/commands/delete_command.rb

Instance Method Summary collapse

Constructor Details

#initialize(adapter, klass_or_instance, options = nil) ⇒ DeleteCommand

Returns a new instance of DeleteCommand.



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# File 'lib/data_mapper/adapters/sql/commands/delete_command.rb', line 8

def initialize(adapter, klass_or_instance, options = nil)
  @adapter, @klass_or_instance, @options = adapter, klass_or_instance, options
end

Instance Method Details

#call ⇒ Object 



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# File 'lib/data_mapper/adapters/sql/commands/delete_command.rb', line 59

def call
  result = nil
  
  if truncate?
    result = execute_truncate(to_sql)
    session.identity_map.clear!(klass) unless session.nil?
  elsif drop?
    result = execute_drop(to_sql)
    session.identity_map.clear!(klass) unless session.nil?
  elsif delete_all?
    result = execute_delete_all(to_sql)
    session.identity_map.clear!(klass) unless session.nil?
  else
    @klass_or_instance.class.callbacks.execute(:before_destroy, @klass_or_instance)
    
    result = execute(to_sql)
    
    if result
      @klass_or_instance.instance_variable_set(:@new_record, true)
      @klass_or_instance.session = session
      @klass_or_instance.original_hashes.clear
      session.identity_map.delete(@klass_or_instance) unless session.nil?
      @klass_or_instance.class.callbacks.execute(:after_destroy, @klass_or_instance)
    end
  end
  
  return result
rescue => error
  @adapter.log.error(error)
  raise error
end

#delete_all? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/data_mapper/adapters/sql/commands/delete_command.rb', line 22

def delete_all?
  return !truncate? && !drop? && @klass_or_instance.kind_of?(Class)
end

#drop? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/data_mapper/adapters/sql/commands/delete_command.rb', line 17

def drop?
  return false if @options.nil?
  @options[:drop]
end

#klass ⇒ Object 



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# File 'lib/data_mapper/adapters/sql/commands/delete_command.rb', line 26

def klass
  @klass_or_instance.kind_of?(Class) ? @klass_or_instance : @klass_or_instance.class
end

#session ⇒ Object 



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# File 'lib/data_mapper/adapters/sql/commands/delete_command.rb', line 54

def session
  return nil if @options.nil?
  @options[:session]
end

#to_delete_sql ⇒ Object 



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# File 'lib/data_mapper/adapters/sql/commands/delete_command.rb', line 38

def to_delete_sql
  sql = "DELETE FROM " << @adapter[klass].to_sql
  sql << " WHERE id = " << @adapter.quote_value(@klass_or_instance.key) unless delete_all?
  return sql
end

#to_drop_sql ⇒ Object 



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# File 'lib/data_mapper/adapters/sql/commands/delete_command.rb', line 34

def to_drop_sql
  "DROP TABLE #{@adapter[@klass_or_instance].to_sql}"
end

#to_sql ⇒ Object 



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# File 'lib/data_mapper/adapters/sql/commands/delete_command.rb', line 44

def to_sql
  if truncate?
    to_truncate_sql
  elsif drop?
    to_drop_sql
  else
    to_delete_sql
  end
end

#to_truncate_sql ⇒ Object 



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# File 'lib/data_mapper/adapters/sql/commands/delete_command.rb', line 30

def to_truncate_sql
  "TRUNCATE TABLE " << @adapter[@klass_or_instance].to_sql
end

#truncate? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/data_mapper/adapters/sql/commands/delete_command.rb', line 12

def truncate?
  return false if @options.nil?
  @options[:truncate]
end