Ruby Dynamic Constant Assignment

But autoloading may still be triggered during eager loading. That is, Ruby iterates over all its directories and for each one of them checks whether they have a file called "erb.rb", or "", or "erb.o", or "erb.dll".If it finds any of them, the interpreter loads it and ends the search.Class and module definitions can be nested to create namespaces: does not belong to it.

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It is beyond the scope of this guide to document Ruby constants, but we are nevertheless going to highlight a few key topics.

Truly grasping the following sections is instrumental to understanding constant autoloading and reloading.

Constants belong to modules in a very literal sense.

Classes and modules have a constant table; think of it as a hash table.

Let's suppose the following snippet creates a class (rather than reopening it): From then on, what happens to the constant and the instance does not matter.

For example, the constant could be deleted, the class object could be assigned to a different constant, be stored in no constant anymore, etc. autoloading, Rails has the ability to load constants on the fly.

Let's analyze an example to really understand what that means.

While common abuses of language like "the constant.

If the constant is not defined at that point it is not considered to be a missing constant, autoloading is not triggered. When a qualified constant is missing Rails does not look for it in the parent namespaces.

But there is a caveat: When a constant is missing, Rails is unable to tell if the trigger was a relative reference or a qualified one.


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