Spent a fair number of hours working out this issue and while I have a
working solution I am not happy with it - it feels really really
We define a custom ActiveRecord sub-class that is used by a number of
our data models that has a custom self.inherited method to register
the sub-classes with the super class as we have super-class level
operations that iterate across all of the sub-classes - factory-like
From our custom sub-class of ActiveRecord::Base
Add all X classes to class-level array for use
in class methods that generate X for all sub-classes.
if (klass.class != X) and (klass.class.to_s !~ /^X/)
# Chain to super or AR classes break!
this works really well for our purposes when class caching is on -
however, with class caching off in development mode, the callbacks do
not get called until the classes are first referenced - so if the
super class methods are called that iterate through the class array of
sub-classes before the sub-classes are all referenced, nothing is
returned because no self.inherited calls have happened …
With class caching on the callbacks are called and life is happy.
I have tried a number of solutions to this for development mode:
- config.prepare_to did not work for this
- eager_load directives did not work for this
- config.after_intialize only works for initial load, fails to be
called on reloead!
- initializer did not work for this as only called once at startup
So far the only one that works for both the initial load of
development and after reload! is called looks like this (from our
The problem of course with this code is that 1) it is horribly ugly
and 2) it undoes the whole intent of the meta-programming when in
development mode - which was to have sub-classes self-register so
that we would not have to explicitly enumerate them and worry about
forgetting to add one should we add another subclass :p.
Any pointers / advice on how to not do it this way but have stuff work
in dev like it does in other environments (works fine with no crazy
code when class caching is true) much appreciated.
XXX - workarounds for class_caching == false in development
Sources for code fixes:
Bootstrap classes being referenced as we use meta-programming that
does not get called in development because class caching
is off. Merely accessing the classes by name triggers the
callbacks that otherwise get called immediately with class
caching on in non-development environments.
Run once on startup after Rails environment is all warmed up and
ready to rock.
Schedule it to be called after every reload!