- Thor::Actions
KeyGenerator is a simple wrapper around OpenSSL's implementation of PBKDF2. It can be used to derive a number of keys for various purposes from a given secret. This lets Rails applications have a single secure secret, but avoid reusing that key in multiple incompatible contexts. Returns a derived key. Returns the default source root for a given generator. This is used internally by rails to set its generators source root. If you want to customize your source root, you should use sourceroot. Check the Ruby on Rails Guides Guidelines for style and conventions. If for whatever reason you spot something to fix but cannot patch it yourself, please open an issue. And last but not least, any kind of discussion regarding Ruby on Rails documentation is very welcome in the rubyonrails-docs mailing list.
Returns the base root for a common set of generators. This is used todynamically guess the default source root.
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Returns the default source root for a given generator. This is usedinternally by rails to set its generators source root. If you want tocustomize your source root, you should use source_root.
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Tries to get the description from a USAGE file one folder above the sourceroot otherwise uses a default description.
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Invoke a generator based on the value supplied by the user to the givenoption named “name”. A class option is created when this methodis invoked and you can set a hash to customize it.
Examples
The example above will create a test framework option and will invoke agenerator based on the user supplied value.
For example, if the user invoke the controller generator as:
The controller generator will then try to invoke the following generators:
Notice that “rails:generators:test_unit“ could be loaded aswell, what Rails looks for is the first andlast parts of the namespace. This is what allows any test framework to hookinto Rails as long as it provides any of thehooks above.
Options
The first and last part used to find the generator to be invoked areguessed based on class invokes hook_for, as noticed in the exampleabove. This can be customized with two options: :base and :as.
Let’s suppose you are creating a generator that needs to invoke thecontroller generator from test unit. Your first attempt is:
The lookup in this case for test_unit as input is:
Which is not the desired the lookup. You can change it by providing the :asoption:
And now it will lookup at:
Similarly, if you want it to also lookup in the rails namespace, you justneed to provide the :base value:
And the lookup is exactly the same as previously:
Switches
All hooks come with switches for user interface. If the user don’twant to use any test framework, he can do:
Or similarly:
Boolean hooks
In some cases, you want to provide a boolean hook. For example, webratdevelopers might want to have webrat available on controller generator.This can be achieved as:
Then, if you want, webrat to be invoked, just supply:
The hooks lookup is similar as above:
Custom invocations
You can also supply a block to hook_for to customize how the hookis going to be invoked. The block receives two arguments, an instance ofthe current class and the klass to be invoked.
For example, in the resource generator, the controller should be invokedwith a pluralized class name. But by default it is invoked with the samename as the resource generator, which is singular. To change this, we cangive a block to customize how the controller can be invoked.
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Convenience method to get the namespace from the class name. It’s thesame as Thor default except that the Generator at the end of the class isremoved.
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Remove a previously added hook.
Examples
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Returns the source root for this generator using default_source_root asdefault.
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Small macro to add ruby as an option to the generator with proper defaultvalue plus an instance helper method called shebang.
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Use Rails default banner.
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Sets the base_name taking intoaccount the current class namespace.
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Return default aliases for the option name given doing a lookup inRails::Generators.aliases.
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Return default for the option name given doing a lookup in config.
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Return the default value for the option name given doing a lookup inRails::Generators.options.
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Removes the namespaces and get the generator name. For example, Rails::Generators::ModelGenerator willreturn “model” as generator name.
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