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Correct Autoloading and STI guide (issue #26994)

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Kevin Reintjes 2017-02-27 17:45:24 +01:00
parent 4cc1c14493
commit b4038ab37a
1 changed files with 8 additions and 9 deletions
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17
guides/source/autoloading_and_reloading_constants.md
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@ -983,20 +983,19 @@ WHERE "polygons"."type" IN ("Rectangle")
That is not a bug, the query includes all *known* descendants of `Rectangle`.
A way to ensure this works correctly regardless of the order of execution is to
load the leaves of the tree by hand at the bottom of the file that defines the
root class:
manually load the direct subclasses at the bottom of the file that defines each
intermediate class:
```ruby
# app/models/polygon.rb
class Polygon < ApplicationRecord
# app/models/rectangle.rb
class Rectangle < Polygon
end
require_dependency ‘square’
require_dependency 'square'
```
Only the leaves that are **at least grandchildren** need to be loaded this
way. Direct subclasses do not need to be preloaded. If the hierarchy is
deeper, intermediate classes will be autoloaded recursively from the bottom
because their constant will appear in the class definitions as superclass.
This needs to happen for every intermediate (non-root and non-leaf) class. The
root class does not scope the query by type, and therefore does not necessarily
have to know all its descendants.
### Autoloading and `require`