diagram model
diagram models does not have an option to hide a particular model. Example, a user model has relationship with all my models, but this relationship is not required to appear in the diagram.
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I've filed two issues: http://www.jetbrains.net/jira/browse/RUBY-3860 for hiding a model and http://www.jetbrains.net/jira/browse/RUBY-3861 for not showing associations