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* * *
This bug can be triggered when serializing record R (the instance) of type C
(the class), provided that the following conditions are met:
1. The name of one or more columns/attributes on C/R matches an existing private
method on C (e.g. those defined by `Kernel`, such as `format`).
2. The attribute methods have not yet been generated on C.
In this case, the matching private methods will be called by the serialization
code (with no arguments) and their return values will be serialized instead. If
the method requires one or more arguments, it will result in an `ArgumentError`.
This regression is introduced in d1316bb.
* * *
Attribute methods (e.g. `#name` and `#format`, assuming the class has columns
named `name` and `format` in its database table) are lazily defined. Instead of
defining them when a the class is defined (e.g. in the `inherited` hook on
`ActiveRecord::Base`), this operation is deferred until they are first accessed.
The reason behind this is that is defining those methods requires knowing what
columns are defined on the database table, which usually requires a round-trip
to the database. Deferring their definition until the last-possible moment helps
reducing unnessary work, especially in development mode where classes are
redefined and throw away between requests.
Typically, when an attribute is first accessed (e.g. `a_book.format`), it will
fire the `method_missing` hook on the class, which triggers the definition of
the attribute methods. This even works for methods like `format`, because
calling a private method with an explicit receiver will also trigger that hook.
Unfortunately, `read_attribute_for_serialization` is simply an alias to `send`,
which does not respect method visibility. As a result, when serializing a record
with those conflicting attributes, the `method_missing` is not fired, and as a
result the attribute methods are not defined one would expected.
Before d1316bb, this is negated by the fact that calling the `run_callbacks`
method will also trigger a call to `respond_to?`, which is another trigger point
for the class to define its attribute methods. Therefore, when Active Record
tries to run the `after_find` callbacks, it will also define all the attribute
methods thus masking the problem.
* * *
The proper fix for this problem is probably to restrict `read_attribute_for_serialization`
to call public methods only (i.e. alias `read_attribute_for_serialization` to
`public_send` instead of `send`). This however would be quite risky to change
in a patch release and would probably require a full deprecation cycle.
Another approach would be to override `read_attribute_for_serialization` inside
Active Record to force the definition of attribute methods:
def read_attribute_for_serialization(attribute)
self.class.define_attribute_methods
send(attribute)
end
Unfortunately, this is quite likely going to cause a performance degradation.
This patch therefore restores the behaviour from the 4-0-stable branch by
explicitly forcing the class to define its attribute methods in a similar spot
(when records are initialized). This should not cause any extra roundtrips to
the database because the `@columns` should already be cached on the class.
Fixes #15188.
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Removed not used code
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Columns and injected types no longer have any conditionals based on the
format of SQL type strings! Hooray!
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Ideally types will be usable without having to specify a sql type
string, so we should keep the information related to parsing them on the
adapter or another object.
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Use the generic type map for all PG type registrations
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We're going to want all of the benefits of the type map object for
registrations, including block registration and real aliasing. Moves
type name registrations to the adapter, and aliases the OIDs to the
named types
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Determining things like precision and scale in postgresql will require
the given blocks to take additional arguments besides the OID.
- Adds the ability to handle additional arguments to `TypeMap`
- Passes the column type to blocks when looking up PG types
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Fixed a problem where `sum` used with a `group` was not returning a Hash.
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with a grouping was not returning a Hash.
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Move extract_scale to decimal type
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The only type that has a scale is decimal. There's a special case where
decimal columns with 0 scale are type cast to integers if the scale is
not specified. Appears to only affect schema dumping.
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Move PG OID types to their own files
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As we promote these classes to first class concepts, these classes are
starting to gain enough behavior to warrant being moved into their own
files. Many of them will become quite large as we move additional
behavior to the type objects.
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Add missing nodoc
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Fix serialized field returning serialized data after update_column
Conflicts:
activerecord/CHANGELOG.md
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This reverts commit 9a1abedcdeecd9464668695d4f9c1d55a2fd9332, reversing
changes made to c72d6c91a7c0c2dc81cc857a1d6db496e84e0065.
Conflicts:
activerecord/CHANGELOG.md
activerecord/test/models/comment.rb
This change break integration with activerecord-deprecated_finders so
I'm reverting until we find a way to make it work with this gem.
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- `extract_precision`, `extract_limit`, and `extract_default` probably need to follow.
- would be good to remove the delegation `Column#extract_scale`.
/cc @sgrif
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Fix polymorphic eager load with foreign_key as String.
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The foreign_key could be `String` and just doing `owners_map[owner_key]`
could return `nil`.
To prevent this bug, we should `to_s` both keys if their types are
different.
Fixes #14734.
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Fixes Issue #13466.
Conflicts:
activerecord/CHANGELOG.md
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Changed the call to a scope block to be evaluated with instance_eval.
The result is that ScopeRegistry can use the actual class instead of base_class when
caching scopes so queries made by classes with a common ancestor won't leak scopes.
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Delegate `klass` to the injected type object
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Making belongs_to: touch behaviour be consistent with save updating updated_at
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alan/only_save_changed_has_one_objects""
This reverts commit e94e6c27af495a2460c811bb506459f1428dec6b.
Conflicts:
activerecord/CHANGELOG.md
The original commit was reverted only to be safe since #14407 were reported.
We don't have any proof we added a regression with the original commit
so reverting it now will give us more problem.
Closes #14407
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Inline typecasting helpers from Column to the appropriate types
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Use the generic type map for PostgreSQL OID registrations
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Replace `type_cast` case statement with delegation
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All subclasses of column were now delegating `type_cast` to their
injected type object. We can remove the overriding methods, and
generalize it on the `Column` class itself. This also enabled us to
remove several column classes completely, as they no longer had any
meaningful behavior of their own.
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Have Postgres OID types inherit from general types
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Using general types where possible. Several more can go away once
infinity gets figured out.
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Delegate `#type_cast` to injected type objects on SQLite3
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Fixes #14824.
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