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  • Correctly save Graphviz diagrams with spaces in the filename (contributed by Neil Chambers).
  • Add only/exclude to CLI (contributed by Dru Ibarra).


  • The internal API is now stable and will be backwards compatible until the next major version.
  • Added experimental command line interface (erd). The CLI still requires a Rails application to be present, but it may one day support other kinds of applications.
  • Crow's foot notation (also known as the Information Engineering notation) can be used by adding 'notation=crowsfoot' to the 'rake erd' command (contributed by Jeremy Holland).
  • Filter models by using the only or exclude options (only=ModelOne,ModelTwo or exclude=ModelThree,ModelFour) from the command line (contributed by Milovan Zogovic).
  • Process column types that are unsupported by Rails (contributed by Erik Gustavson).
  • Ignore custom limit/scale attributes that cannot be converted to an integer (reported by Adam St. John).


  • Display more helpful error message when the application models could not be loaded successfully by the 'rake erd' task (reported by Greg Weber).


  • Added the ability to disable HTML markup in node labels (markup=false). This causes .dot files to be compatible with OmniGraffle, which otherwise fails to import graphs with HTML node labels (issue reported by Lucas Florio, implementation based on template by Troy Anderson).
  • Prevent models named after Graphviz reserved words (Node, Edge) from causing errors in .dot files (reported by gguthrie).
  • Improved error messages when Graphviz is throwing errors (reported by Michael Irwin).


  • Display the scale of decimal attributes when set. A decimal attribute with precision 5 and scale 2 is now indicated with (5,2).
  • Fixed deprecation warnings for edge Rails (upcoming 3.1).


  • Fix processing of associations with class_name set to absolute module paths.
  • Adjust model loading process to include models in non-standard paths eagerly.


  • Support to optionally display single table inheritance relationships (inheritance=true).
  • Support to optionally display polymorphic associations (polymorphism=true).
  • Adjustments to 'advanced' style so that it matches original Bachman style, and therefore now called 'bachman'.
  • Ignore models without tables (reported by Mark Chapman).
  • Mutual indirect relationships are now combined.
  • Changed API for diagram generation.
  • Restructured classes and renamed several API properties and methods.
  • Added new edge type to describe single table inheritance and polymorphic associations: Specialization.
  • Added compatibility for Active Record 3.1 (beta), removed dependency on Arel.
  • Rubinius compatibility.


  • Added the ability to support multiple styles of cardinality notations. Currently supported types are 'simple' and 'advanced'.
  • Added option to exclude indirect relationships (indirect=false).
  • Added option to change or disable the diagram title (title='Custom title').
  • Altered the type descriptions of attributes.
  • Renamed options for flexibility and clarity.
  • Improved internal logic to determine the cardinality of relationships.
  • More versatile API that allows you to inspect relationships and their cardinalities.
  • Changed line widths to 1.0 to avoid invisible node boundaries with older versions of Graphviz (reported by Mike McQuinn).
  • Bundled examples based on actual applications.


  • Added simple way to create your own type of diagrams with a tiny amount of code.
  • Improved internal API and documentation.
  • Subtle changes in diagram style.
  • Fixed error where non-mutual relationships might be inadvertently classified as indirect relationships.
  • Fixed error where diagrams with a vertical layout might fail to be generated.


  • Fixed small errors in Ruby 1.8.7.
  • Abort generation of diagrams when there are no models.


  • Released on September 20th, 2010.
  • First public release.
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