Class: Groonga::Schema::Dumper

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

Overview

:nodoc:

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Dumper

Returns a new instance of Dumper.



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# File 'lib/groonga/schema.rb', line 840

def initialize(options={})
  @options = (options || {}).dup
end

Instance Method Details

#dump ⇒ Object 



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# File 'lib/groonga/schema.rb', line 844

def dump
  context = @options[:context] || Groonga::Context.default
  database = context.database
  return nil if database.nil?

  reference_columns = []
  definitions = []
  database.each do |object|
    next unless object.is_a?(Groonga::Table)
    schema = "create_table(#{object.name.inspect}) do |table|\n"
    object.columns.sort_by {|column| column.local_name}.each do |column|
      if column.range.is_a?(Groonga::Table)
        reference_columns << column
      else
        type = column_method(column)
        name = column.local_name
        schema << "  table.#{type}(#{name.inspect})\n"
      end
    end
    schema << "end"
    definitions << schema
  end

  reference_columns.group_by do |column|
    column.table
  end.each do |table, columns|
    schema = "change_table(#{table.name.inspect}) do |table|\n"
    columns.each do |column|
      name = column.local_name
      reference = column.range
      schema << "  table.reference(#{name.inspect}, " +
                                  "#{reference.name.inspect})\n"
    end
    schema << "end"
    definitions << schema
  end

  if definitions.empty?
    ""
  else
    definitions.join("\n\n") + "\n"
  end
end