File: CHANGES.rdoc [Rails ERD – API Documentation]

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).

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.