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It's finally finished!!!!!!! The reason the Attributes API was kept
private in 4.2 was due to some publicly visible implementation details.
It was previously implemented by overloading `columns` and
`columns_hash`, to make them return column objects which were modified
with the attribute information.
This meant that those methods LIED! We didn't change the database
schema. We changed the attribute information on the class. That is
wrong! It should be the other way around, where schema loading just
calls the attributes API for you. And now it does!
Yes, this means that there is nothing that happens in automatic schema
loading that you couldn't manually do yourself. (There's still some
funky cases where we hit the connection adapter that I need to handle,
before we can turn off automatic schema detection entirely.)
There were a few weird test failures caused by this that had to be
fixed. The main source came from the fact that the attribute methods are
now defined in terms of `attribute_names`, which has a clause like
`return [] unless table_exists?`. I don't *think* this is an issue,
since the only place this caused failures were in a fake adapter which
didn't override `table_exists?`.
Additionally, there were a few cases where tests were failing because a
migration was run, but the model was not reloaded. I'm not sure why
these started failing from this change, I might need to clear an
additional cache in `reload_schema_from_cache`. Again, since this is not
normal usage, and it's expected that `reset_column_information` will be
called after the table is modified, I don't think it's a problem.
Still, test failures that were unrelated to the change are worrying, and
I need to dig into them further.
Finally, I spent a lot of time debugging issues with the mutex used in
`define_attribute_methods`. I think we can just remove that method
entirely, and define the attribute methods *manually* in the call to
`define_attribute`, which would simplify the code *tremendously*.
Ok. now to make this damn thing public, and work on moving it up to
Active Model.
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Building the Arel AST, and manipulating the relation manually like this
is prone to errors and breakage as implementation details change from
underneath it.
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The reason this bug occured is that we never actually check to see if
this column has changed from it's default, since it was never assigned
and is not mutable.
It appears I was wrong in b301c40224c6d15b539dbcc7485adb44d810f88c, with
my statement of "there is no longer a case where a given value would
differ from the default, but would not already be marked as changed."
However, I chose not to revert the deletion of
`initialize_internals_callback` from that commit, as I think a solution
closer to where the problem lies is less likely to get erroneously
removed. I'm not super happy with this solution, but it mirrors what is
being done in `_update_record`, and a fix for one should work for the
other.
I toyed with the idea of changing the definition of `changed?` on the
type to `changed_in_place?`. If we type cast the raw value, it'll break
a test about updating not modifying the lock column if nothing else was
changed. We could have the definition check if `raw_old_value` is `nil`,
but this feels fragile and less intention revealing. It would, however,
have the benefit of cleaning up old data that incorrectly persisted as
`nil`.
Fixes #18422
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Part of the larger refactoring to remove type casting from Arel. We can
inform it that we already have the right type by wrapping the value in
an `Arel::Nodes::Quoted`. This commit can be reverted when we have
removed type casting from Arel in Rail 5.1
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Oh hey, we got to remove some code because of that!
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We are moving this behavior out to an object that we would like to keep
separated from `ActiveRecord::Base`, which means not passing the class
object to it. As such, we need to stop using `instance_exec`, and
instead close over the subclass on global type decorators that are
applied in `Base`.
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Adding `# :nodoc:` to the parent `class` / `module` is not going
to ignore nested classes or modules.
There is a modifier `# :nodoc: all` but sadly the containing class
or module will continue to be in the docs.
/cc @sgrif
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Reduces the number of things outside of attribute methods that cares
about the details of how we store and type cast attributes
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`@attributes` was actually used for `_before_type_cast` and friends,
while `@attributes_cache` is the type cast version (and caching is the
wrong word there, but I'm working on removing the conditionals around
that). I opted for `@raw_attributes`, because `_before_type_cast` is
also semantically misleading. The values in said hash are in the state
given by the form builder or database, so raw seemed to be a good word.
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This is to ensure that they are not accidentally called by the app code.
They are renamed to _create_record and _update_record respectively.
Closes #11645
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Account.find(1, lock: true)
-> DEPRECATION WARNING: Passing options to #find is deprecated. Please build a scope and then call #find on it.
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This includes fixing typos in changelog, removing a deprecated
mocha/setup test require, and preferring the `column_for_attribute`
accessor over direct access to the columns_hash in the new code.
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When calling quote_value the underlying connection sometimes requires
more information about the column to properly return the correct quoted
value.
I ran into this issue when using optimistic locking in JRuby and the
activerecord-jdbcmssql-adapter. In SQLSever 2000, we aren't allowed to
insert a integer into a NVARCHAR column type so we need to format it as
N'3' if we want to insert into the NVARCHAR type. Unfortuantely, without
the column type being passed the connection adapter cannot properly return
the correct quote value because it doesn't know to return N'3' or '3'.
This patch is fairly straight forward where it just passes in the column
type into the quote_value, as it already has the ability to take in the column,
so it can properly handle at the connection level.
I've added the tests required to make sure that the quote_value method
is being passed the column type so that the underlying connection can
determine how to quote the value.
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This allows end-users to have a `connection` method on their models
without clashing with ActiveRecord internals.
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Conflicts:
guides/source/getting_started.md
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particularly, `all(options)` would warn
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In the end I think the pain of implementing this seamlessly was not
worth the gain provided.
The intention was that it would allow plain ruby objects that might not
live in your main application to be subclassed and have persistence
mixed in. But I've decided that the benefit of doing that is not worth
the amount of complexity that the implementation introduced.
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This reverts commit 83846838252397b3781eed165ca301e05db39293.
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I think it's going to be too much pain to try to transition the
:active_record load hook from executing against Base to executing
against Model.
For example, after Model is included in Base, and modules included in
Model will no longer get added to the ancestors of Base.
So plugins which wish to be compatible with both Model and Base should
use the :active_record_model load hook which executes *before* Base gets
loaded.
In general, ActiveRecord::Model is an advanced feature at the moment and
probably most people will continue to inherit from ActiveRecord::Base
for the time being.
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Rather than doing it every time an instance is instantiated.
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exists in class method.
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Get rid of ActiveModel::Configuration, make better use of
ActiveSupport::Concern + class_attribute, etc.
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Fix deleting from a HABTM join table upon destroying an object of a model with optimistic locking enabled.
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with optimistic locking enabled. Issue #5332.
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* Relation#order can receive order attributes as different arguments,
add example;
* Readonly does not handle deletion of records, only modification;
* locking_version column does not need to default to 0, Rails handles
nil values;
* Change references from "set_locking_column" to "self.locking_column".
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Add a `with_lock` method to ActiveRecord objects, which starts
a transaction, locks the object (pessimistically) and yields to the block.
The method takes one (optional) parameter and passes it to `lock!`.
Before:
class Order < ActiveRecord::Base
def cancel!
transaction do
lock!
# ... cancelling logic
end
end
end
After:
class Order < ActiveRecord::Base
def cancel!
with_lock do
# ... cancelling logic
end
end
end
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The problem: We need to be able to specify configuration in a way that
can be inherited to models that include ActiveRecord::Model. So it is
no longer sufficient to put 'top level' config on ActiveRecord::Base,
but we do want configuration specified on ActiveRecord::Base and
descendants to continue to work.
So we need something like class_attribute that can be defined on a
module but that is inherited when ActiveRecord::Model is included.
The solution: added ActiveModel::Configuration module which provides a
config_attribute macro. It's a bit specific hence I am not putting this
in Active Support or making it a 'public API' at present.
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across web workers.
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for generating SQL. This improves the code architecture generally, and solves some problems with marshalling. Adapter authors please take note: you now need to define an Adapter.visitor_for method, but it degrades gracefully with a deprecation warning for now.
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