Module: ActiveRecord::DatabaseSchema::Dumper

Extended by:
ActiveSupport::Concern
Defined in:
lib/active_record/database_schema/dumper.rb

Instance Method Summary collapse

Instance Method Details

#table_with_extended_support(table, stream) ⇒ Object

Override de #table



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# File 'lib/active_record/database_schema/dumper.rb', line 14

def table_with_extended_support(table, stream)
  columns = @connection.columns(table)
  
  begin
    tbl = StringIO.new
  
    # first dump primary key column
    if @connection.respond_to?(:pk_and_sequence_for)
      pk, _ = @connection.pk_and_sequence_for(table)
    elsif @connection.respond_to?(:primary_key)
      pk = @connection.primary_key(table)
    end
    
    tbl.print "  create_table #{remove_prefix_and_suffix(table).inspect}"
    if columns.detect { |c| c.name == pk }
      if pk != 'id'
        tbl.print %Q(, :primary_key => "#{pk}")
      end
    else
      tbl.print ", :id => false"
    end
    tbl.print ", :force => true"
    #TODO: Cambiar que en vez de ponerlo en :options, ponerlo en :mysql_options:
    #tbl.print ", :options =>\"#{@connection.table_options(table)}\""
    tbl.puts " do |t|"
  
    # then dump all non-primary key columns
    column_specs = columns.map do |column|
      raise StandardError, "Unknown type '#{column.sql_type}' for column '#{column.name}'" if @types[column.type].nil?
      next if column.name == pk
      spec = {}
      spec[:name]      = column.name.inspect
  
      # AR has an optimization which handles zero-scale decimals as integers. This
      # code ensures that the dumper still dumps the column as a decimal.
      spec[:type]      = if column.type == :integer && [/^numeric/, /^decimal/].any? { |e| e.match(column.sql_type) }
                           'decimal'
                         else
                           column.type.to_s
                         end
      # Unsigned Column Support:
      spec[:unsigned]  = 'true' if /unsigned/i.match(column.sql_type)
      spec[:limit]     = column.limit.inspect if column.limit != @types[column.type][:limit] && spec[:type] != 'decimal'
      spec[:precision] = column.precision.inspect if column.precision
      spec[:scale]     = column.scale.inspect if column.scale
      spec[:null]      = 'false' unless column.null
      spec[:default]   = default_string(column.default) if column.has_default?
      # Column Comment Support:
      spec[:comment]   = "\"#{column.comment}\"" if column.respond_to?(:comment) and column.comment.present?
      (spec.keys - [:name, :type]).each{ |k| spec[k].insert(0, "#{k.inspect} => ")}
      spec
    end.compact
    
    # find all migration keys used in this table
    keys = [:name, :limit, :unsigned, :precision, :scale, :default, :null, :comment] & column_specs.map{ |k| k.keys }.flatten
  
    # figure out the lengths for each column based on above keys
    lengths = keys.map{ |key| column_specs.map{ |spec| spec[key] ? spec[key].length + 2 : 0 }.max }
  
    # the string we're going to sprintf our values against, with standardized column widths
    format_string = lengths.map{ |len| "%-#{len}s" }
  
    # find the max length for the 'type' column, which is special
    type_length = column_specs.map{ |column| column[:type].length }.max
  
    # add column type definition to our format string
    format_string.unshift "    t.%-#{type_length}s "
  
    format_string *= ''
  
    column_specs.each do |colspec|
      values = keys.zip(lengths).map{ |key, len| colspec.key?(key) ? colspec[key] + ", " : " " * len }
      values.unshift colspec[:type]
      tbl.print((format_string % values).gsub(/,\s*$/, ''))
      tbl.puts
    end
  
    tbl.puts "  end"
    tbl.puts
  
    indexes(table, tbl)
  
    tbl.rewind
    stream.print tbl.read
  rescue => e
    stream.puts "# Could not dump table #{table.inspect} because of following #{e.class}"
    stream.puts "#   #{e.message}"
    stream.puts
  end
  
  stream
end