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Ignore calls to subclasses and descendants from rails 7 callers
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Rails changed in 7.0 to call subclasses from reload_schema_from_cache here:
rails/rails@6f30cc0

It also changed to call descendants on the callback class (self) insead of
the ActiveSupport::DescendantsTracker here:
rails/rails@ffae3bd

We're now getting called in descendants and subclasses from rails very
early, at code load time, before models or as models are in between loading.
We cannot trigger loads of subclasses while we're loading the existing class
so we must wait and avoid it at this point.
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@jrafanie
jrafanie committed Jul 31, 2024
1 parent f6dfd4f commit c17092f
Showing 1 changed file with 58 additions and 5 deletions.
63 changes: 58 additions & 5 deletions lib/extensions/descendant_loader.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -261,20 +261,73 @@ def scoped_name(name, scopes)
end

module ArDescendantsWithLoader
# Use caution if modifying the list of excluded caller_locations below.
# These methods are called very early from rails during code load time,
# before the models are even loaded, as documented below.
# Ideally, a more resilient conditional can be used in the future.
#
# Called from __update_callbacks during model load time:
# "xxx/gems/activesupport-7.0.8.4/lib/active_support/callbacks.rb:706:in `__update_callbacks'",
# "xxx/gems/activesupport-7.0.8.4/lib/active_support/callbacks.rb:764:in `set_callback'",
# "xxx/gems/activemodel-7.0.8.4/lib/active_model/validations.rb:172:in `validate'",
# "xxx/gems/activemodel-7.0.8.4/lib/active_model/validations/with.rb:96:in `block in validates_with'",
# "xxx/gems/activemodel-7.0.8.4/lib/active_model/validations/with.rb:85:in `each'",
# "xxx/gems/activemodel-7.0.8.4/lib/active_model/validations/with.rb:85:in `validates_with'",
# "xxx/gems/activemodel-7.0.8.4/lib/active_model/validations/format.rb:109:in `validates_format_of'",
# "xxx/gems/ancestry-4.1.0/lib/ancestry/has_ancestry.rb:30:in `has_ancestry'",
# "xxx/manageiq/app/models/vm_or_template.rb:15:in `<class:VmOrTemplate>'",
# "xxx/manageiq/app/models/vm_or_template.rb:6:in `<main>'",
def descendants
if Vmdb::Application.instance.initialized? && !defined? @loaded_descendants
if Vmdb::Application.instance.initialized? && !defined?(@loaded_descendants) && !%w[__update_callbacks].include?(caller_locations.first.base_label)
@loaded_descendants = true
DescendantLoader.instance.load_subclasses(self)
end

super
end

# Rails 6.1 added an alias for subclasss to call direct_descendants in:
# https://github.com/rails/rails/commit/8f8aa857e084b76b1120edaa9bb9ce03ba1e6a19
# We need to get in front of it, like we do for descendants.
# Use caution if modifying the list of excluded caller_locations below.
# These methods are called very early from rails during code load time,
# before the models are even loaded, as documented below.
# Ideally, a more resilient conditional can be used in the future.
#
# Called from reload_schema_from_cache from virtual column definitions from ar_region from many/all models:
# "xxx/gems/activerecord-7.0.8.4/lib/active_record/model_schema.rb:609:in `reload_schema_from_cache'",
# "xxx/gems/activerecord-7.0.8.4/lib/active_record/timestamp.rb:94:in `reload_schema_from_cache'",
# "xxx/bundler/gems/activerecord-virtual_attributes-2c077434608f/lib/active_record/virtual_attributes.rb:60:in `virtual_attribute'",
# "xxx/bundler/gems/activerecord-virtual_attributes-2c077434608f/lib/active_record/virtual_attributes.rb:55:in `virtual_column'",
# "xxx/manageiq/lib/extensions/ar_region.rb:14:in `block in inherited'",
# "xxx/manageiq/lib/extensions/ar_region.rb:13:in `class_eval'",
# "xxx/manageiq/lib/extensions/ar_region.rb:13:in `inherited'",
# "xxx/manageiq/app/models/vm_or_template.rb:6:in `<main>'",
#
# Called from subclasses call in descendant_loader after the above callstack:
# "xxx/gems/activesupport-7.0.8.4/lib/active_support/descendants_tracker.rb:83:in `subclasses'",
# "xxx/manageiq/lib/extensions/descendant_loader.rb:313:in `subclasses'",
# "xxx/gems/activerecord-7.0.8.4/lib/active_record/model_schema.rb:609:in `reload_schema_from_cache'",
# ...
#
# Called from descendants from descendant_loader via __update_callbacks:
# "xxx/gems/activesupport-7.0.8.4/lib/active_support/descendants_tracker.rb:89:in `descendants'",
# "xxx/manageiq/lib/extensions/descendant_loader.rb:296:in `descendants'",
# "xxx/gems/activesupport-7.0.8.4/lib/active_support/callbacks.rb:706:in `__update_callbacks'",
# "xxx/gems/activesupport-7.0.8.4/lib/active_support/callbacks.rb:764:in `set_callback'",
# "xxx/gems/activemodel-7.0.8.4/lib/active_model/validations.rb:172:in `validate'",
# "xxx/gems/activemodel-7.0.8.4/lib/active_model/validations/with.rb:96:in `block in validates_with'",
# "xxx/gems/activemodel-7.0.8.4/lib/active_model/validations/with.rb:85:in `each'",
# "xxx/gems/activemodel-7.0.8.4/lib/active_model/validations/with.rb:85:in `validates_with'",
# "xxx/gems/activemodel-7.0.8.4/lib/active_model/validations/format.rb:109:in `validates_format_of'",
# "xxx/gems/ancestry-4.1.0/lib/ancestry/has_ancestry.rb:30:in `has_ancestry'",
# "xxx/manageiq/app/models/vm_or_template.rb:15:in `<class:VmOrTemplate>'",
# "xxx/manageiq/app/models/vm_or_template.rb:6:in `<main>'",
#
# Called from subclasses from above callstack:
# "xxx/gems/activesupport-7.0.8.4/lib/active_support/descendants_tracker.rb:83:in `subclasses'",
# "xxx/manageiq/lib/extensions/descendant_loader.rb:313:in `subclasses'",
# "xxx/gems/activesupport-7.0.8.4/lib/active_support/descendants_tracker.rb:89:in `descendants'",
# ...
def subclasses
if Vmdb::Application.instance.initialized? && !defined? @loaded_descendants
if Vmdb::Application.instance.initialized? && !defined?(@loaded_descendants) && !%w[descendants reload_schema_from_cache subclasses].include?(caller_locations.first.base_label)
@loaded_descendants = true
DescendantLoader.instance.load_subclasses(self)
end
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