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Fix habtm reflection
Conflicts:
activerecord/CHANGELOG.md
activerecord/lib/active_record/counter_cache.rb
activerecord/lib/active_record/reflection.rb
activerecord/test/cases/reflection_test.rb
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Simplifies the code slightly, isolates non-nil non-range values into a
single array, which will make it easier to do things like apply type
casting to them in the future.
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Remove checks against `column.type` in abstract adapter quoting
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The intention is to eventually remove `column` from the arguments list
both for `quote` and for `type_cast` entirely. This is the first step
to that end.
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It appears that the only time that `quote` is called with a column,
but without first calling `type_cast` is when where is called with an
array. My previous pull request broke this behavior, without failing
tests. This adds a test for the only case I can think of that exercises
the `if column.type == :integer` branch of `quote` effectively.
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Add an interface for type objects to control Ruby => SQL
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Adds the ability to save custom types, which type cast to non-primitive
ruby objects.
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`warning: assigned but unused variable - album`
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This mirrors the layout of abstract adapter and puts the definitions
inside the `PostgreSQL` namespace (no longer under the adapter namespace).
/cc @kares
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Remove special case in schema dumper for decimal without scale
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Future port c8ddb61 [ci skip]
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sergey-alekseev/remove-active-record-where-duplicated-condition
Remove duplicated parameter check on #where!
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It seems that #where! is not designed to be used as a chained where.
See initial implementation at 8c2c60511beaad05a218e73c4918ab89fb1804f0.
So, no need to check twice.
We should not test #where!
https://github.com/rails/rails/pull/15285#discussion_r13018316
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Simplify the code in schema cache
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The use of default procs was unnessecary, made the code confusing to
follow, and made marshalling needlessly complex.
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Bring the missing parameters back.
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Remove `Column#primary`
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It appears to have been used at some point in the past, but is no longer
used in any meaningful way. Whether a column is considered primary is
a property of the model, not the schema/column. This also removes the
need for yet another layer of caching of the model's schema, and we can
leave that to the schema cache.
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Added force_reload to Auto-generated methods doc
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Should make it a little easier to find the information. Also added note to look below for the definition of the generated methods.
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Move parsing of PG sql strings for defaults out of column
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Remove duplicated setup in test
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Inline type cast method for PG points
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Change typecasting unit tests to test type objects directly
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There's no longer type casting behavior of any kind inside of `Column`
for the general case. These tests can be made clearer by testing the
type objects directly.
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2d73f5a forces AR to enter the `define_attribute_methods` method whenever it
instantiate a record from the `init_with` entry point. This is a potential
performance hotspot, because `init_with` is called from all `find*` family
methods, and `define_attribute_methods` is slow because it tries to acquire
a lock on the mutex everytime it is entered.
By using [DCL](http://en.wikipedia.org/wiki/Double-checked_locking), we can
avoid grabbing the lock most of the time when the attribute methods are already
defined (the common case). This is made possible by the fact that reading an
instance variable is an atomic operation in Ruby.
Credit goes to Aaron Patterson for pointing me to DCL and filling me in on the
atomicity guarantees in Ruby.
[*Godfrey Chan*, *Aaron Patterson*]
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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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Allow additional arguments to be used during type map lookups
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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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