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has_many_polymorphs will scan through the models directory for any files that include the plugin and preload them. This can cause problems if these models depend on other plugins (that have not yet been loaded) to operate correctly. The has_many_polymorphs source mentions this behavior in a comment and includes a fix:
Searches for models that use has_many_polymorphs or acts_as_double_polymorphic_join and makes sure that they get loaded during app initialization. This ensures that helper methods are injected into the target classes.
Note that you can override DEFAULT_OPTIONS via Rails::Configuration#has_many_polymorphs_options. For example, if you need an application extension to be required before has_many_polymorphs loads your models, add an after_initialize block in config/environment.rb that appends to the ‘requirements’ key:
Rails::Initializer.run do |config| # your other configuration here config.after_initialize do config.has_many_polymorphs_options['requirements'] << 'lib/my_extension' end end
Instead of using config.has_many_polymorphs_options, we were able to achieve the same effect by simply dropping our required plugins into the after_initialize block. If we decide to remove has_many_polymorphs in the future, the config file should still run correctly. It’s worth noting that the UltraSphinx search plugin operates in a similar fashion.
assert_text_present offers a simple way to test Ajax behaviors in Selenium, as it will wait 5 seconds (during which the Ajax callback can complete) while looking for the specified text (which can be the body of your Ajax response). Another strategy with which we’ve had some luck is to write a custom method that will wait a specified amount of time before continuing (particularly useful if your Ajax call takes a lengthy amount of time to complete).