Class: SerializationHelper::Load

Inherits:
Object
  • Object
show all
Defined in:
lib/serialization_helper.rb

Direct Known Subclasses

CsvDb::Load, YamlDb::Load

Class Method Summary collapse

Class Method Details

.load(io, truncate = true) ⇒ Object 



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# File 'lib/serialization_helper.rb', line 58

def self.load(io, truncate = true)
  ActiveRecord::Base.connection.transaction do
    load_documents(io, truncate)
  end
end

.load_records(table, column_names, records) ⇒ Object 



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# File 'lib/serialization_helper.rb', line 83

def self.load_records(table, column_names, records)
  if column_names.nil?
    return
  end
  columns = column_names.map{|cn| ActiveRecord::Base.connection.columns(table).detect{|c| c.name == cn}}
  quoted_column_names = column_names.map { |column| ActiveRecord::Base.connection.quote_column_name(column) }.join(',')
  quoted_table_name = SerializationHelper::Utils.quote_table(table)
  records.each do |record|
    quoted_values = record.zip(columns).map{|c| ActiveRecord::Base.connection.quote(c.first, c.last)}.join(',')
    ActiveRecord::Base.connection.execute("INSERT INTO #{quoted_table_name} (#{quoted_column_names}) VALUES (#{quoted_values})")
  end
end

.load_table(table, data, truncate = true) ⇒ Object 



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# File 'lib/serialization_helper.rb', line 74

def self.load_table(table, data, truncate = true)
  column_names = data['columns']
  if truncate
    truncate_table(table)
  end
  load_records(table, column_names, data['records'])
  reset_pk_sequence!(table)
end

.reset_pk_sequence!(table_name) ⇒ Object 



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# File 'lib/serialization_helper.rb', line 96

def self.reset_pk_sequence!(table_name)
  if ActiveRecord::Base.connection.respond_to?(:reset_pk_sequence!)
    ActiveRecord::Base.connection.reset_pk_sequence!(table_name)
  end
end

.truncate_table(table) ⇒ Object 



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# File 'lib/serialization_helper.rb', line 64

def self.truncate_table(table)
  begin
    ActiveRecord::Base.connection.execute("SAVEPOINT before_truncation")
    ActiveRecord::Base.connection.execute("TRUNCATE #{SerializationHelper::Utils.quote_table(table)} CASCADE")
  rescue Exception
    ActiveRecord::Base.connection.execute("ROLLBACK TO SAVEPOINT before_truncation")
    ActiveRecord::Base.connection.execute("DELETE FROM #{SerializationHelper::Utils.quote_table(table)}")
  end
end