| Commit message (Collapse) | Author | Age | Files | Lines |
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* Allow a default value to be declared for class_attribute
* Convert to using class_attribute default rather than explicit setter
* Removed instance_accessor option by mistake
* False is a valid default value
* Documentation
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ActiveRecord initialization optimizations
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Memoize the #column_defaults class property, as ActiveRecord does
for other properties in this module.
This change addresses slowness in ActiveRecord initialization
introduced starting in Rails 5.0. This method's performance has not
changed with Rails 5, but it is now called much more frequently than
before: every time an STI model is instantiated.
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[Vikrant Chaudhary, David Abdemoulaie, Matthew Draper]
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So queries are not run against the previous table name.
Closes #27953
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Mainly around `nil`
[ci skip]
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* Put a blank line after :call-seq: otherwise it will think the whole test
is the call seq.
* Improve some text.
* Use some rdoc formatting.
* Restores the documentation of table_name_prefix.
[ci skip]
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All indentation was normalized by rubocop auto-correct at 80e66cc4d90bf8c15d1a5f6e3152e90147f00772.
But comments was still kept absolute position. This commit aligns
comments with method definitions for consistency.
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There are some minor changes to the point type as I had forgotten that
this will affect the behavior of `t.point` in migrations and the schema
dumper so we need to handle those as well.
I'll say this again so I can convince myself to come up with a better
structure... TYPES SHOULD NOT CARE ABOUT SCHEMA DUMPING AND WE NEED TO
BETTER SEPARATE THESE.
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For reduce instantiating `Type::Value`.
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Style/SpaceBeforeBlockBraces
Style/SpaceInsideBlockBraces
Style/SpaceInsideHashLiteralBraces
Fix all violations in the repository.
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A few have been left for aesthetic reasons, but have made a pass
and removed most of them.
Note that if the method `foo` returns an array, `foo << 1`
is a regular push, nothing to do with assignments, so
no self required.
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The current code base is not uniform. After some discussion,
we have chosen to go with double quotes by default.
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Previously we had primarily tested the behavior of these attributes by
calling `.new`, allowing this to slip through the cracks. There were a
few ways in which they were behaving incorrectly.
The biggest issue was that attempting to read the attribute would
through a `MissingAttribute` error. We've corrected this by returning
the default value when the attribute isn't backed by a database column.
This is super special cased, but I don't see a way to avoid this
conditional. I had considered handling this higher up in
`define_default_attribute`, but we don't have the relevant information
there as users can provide new defaults for database columns as well.
Once I corrected this, I had noticed that the attributes were always
being marked as changed. This is because the behavior of
`define_default_attribute` was treating them as assigned from
`Attribute::Null`.
Finally, with our new implementation, `LazyAttributeHash` could no
longer be marshalled, as it holds onto a proc. This has been corrected
as well. I've not handled YAML in that class, as we do additional work
higher up to avoid YAML dumping it at all.
Fixes #25787
Close #25841
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Where appropriatei, prefer the more concise Regexp#match?,
String#include?, String#start_with?, or String#end_with?
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When `group` is used in combination with any calculation method, the
resulting hash uses the grouping expression as the key. Currently we're
incorrectly always favoring the type reported by the query, instead of
the type known by the class. This causes differing behavior depending on
whether the adaptor actually gives proper types with the query or not.
After this change, the behavior will be the same on all adaptors -- we
see if we know the type from the class, fall back to the type from the
query, and finally fall back to the identity type.
Fixes #25595
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This reduces the size of a YAML encoded Active Record object by ~80%
depending on the number of columns. There were a number of wasteful
things that occurred when we encoded the objects before that have
resulted in numerous wins
- We were emitting the result of `attributes_before_type_cast` as a hack
to work around some laziness issues
- The name of an attribute was emitted multiple times, since the
attribute objects were in a hash keyed by the name. We now store them
in an array instead, and reconstruct the hash using the name
- The types were included for every attribute. This would use backrefs
if multiple objects were encoded, but really we don't need to include
it at all unless it differs from the type at the class level. (The
only time that will occur is if the field is the result of a custom
select clause)
- `original_attribute:` was included over and over and over again since
the ivar is almost always `nil`. We've added a custom implementation
of `encode_with` on the attribute objects to ensure we don't write the
key when the field is `nil`.
This isn't without a cost though. Since we're no longer including the
types, an object can find itself in an invalid state if the type changes
on the class after serialization. This is the same as 4.1 and earlier,
but I think it's worth noting.
I was worried that I'd introduce some new state bugs as a result of
doing this, so I've added an additional test that asserts mutation not
being lost as the result of YAML round tripping.
Fixes #25145
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This reverts commit 7b82e1c77b48cb351da4e0ed6ea0bac806d4925c.
This would have removed the ability to reference a schema when using PG
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Dots have special meaning in most backends (e.g. everything except
SQLite3), as well as most methods that work with table or column names.
This isn't something that we ever explicitly supported, but there's at
least one case of somebody using this (see #24367), so we'll go through a deprecation
cycle as normal.
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`prefetch_primary_key?` and `next_sequence_value` methods live in the
connection level at the moment, that make sense when you are generating
the sequence from the database, in the same connection. Which is the use
case today at the Oracle and Postgres adapters.
However if you have an service that generates IDs, that has nothing to
do with the database connection, and should not be fetched from there.
Another use case, is if you want to use another connection to fetch IDs,
that would not be possible with the current implementation, however when
we move those methods to the model level, you can use a new connection
there.
Also this makes easier for gems to add behavior on those methods.
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to support Oracle database which only supports 30 byte identifier length
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We want this method to be the single canonical source of information
about type metadata related to a model. This is the method I've been
continuously recommending people use if they need this sort of access,
as I have no plans to remove or change it at any point in the future.
We can do ourselves a favor and get people to use this instead of
relying on some other part of the internals that they shouldn't be by
making this method public.
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Prevent destructive action on production database
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This PR introduces a key/value type store to Active Record that can be used for storing internal values. It is an alternative implementation to #21237 cc @sgrif @matthewd.
It is possible to run your tests against your production database by accident right now. While infrequently, but as an anecdotal data point, Heroku receives a non-trivial number of requests for a database restore due to this happening. In these cases the loss can be large.
To prevent against running tests against production we can store the "environment" version that was used when migrating the database in a new internal table. Before executing tests we can see if the database is a listed in `protected_environments` and abort. There is a manual escape valve to force this check from happening with environment variable `DISABLE_DATABASE_ENVIRONMENT_CHECK=1`.
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Since the attributes API is new in Rails 5, we don't actually need to keep
the behavior of `attribute :point`, as it's not a breaking change.
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Even though this means more things to change when we bump after a
release, it's more important that our examples are directly copyable.
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If we use a real version, at best that'll be an onerous update required
for each release; at worst, it will encourage users to write new
migrations against an older version than they're using.
The other option would be to leave these bare, without any version
specifier. But as that's just a variant spelling of "4.2", it would seem
to raise the same concerns as above.
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I've added a redundant test for this under the attributes API as well,
as that also causes this bug to manifest through public API (and
demonstrates that calling `reset_column_information` on the child
classes would be insufficient)
Since children of a class should always share a table with their parent,
just reloading the schema from the cache should be sufficient here.
`reload_schema_from_cache` should probably become public and
`# :nodoc:`, but I'd rather avoid the git churn here.
Fixes #22057
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These new methods are used from the Active Record model layer to
determine which relations are viable to back a model. These new methods
allow us to change `conn.tables` in the future to only return tables and
no views. Same for `conn.table_exists?`.
The goal is to provide the following introspection methods on the
connection:
* `tables`
* `table_exists?`
* `views`
* `view_exists?`
* `data_sources` (views + tables)
* `data_source_exists?` (views + tables)
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This introduces a deprecation cycle to change the behavior of the
default point type in the PostgreSQL adapter. The old behavior will
continue to be available for the immediate future as `:legacy_point`.
The current behavior of returning an `Array` causes several problems,
the most significant of which is that we cannot differentiate between an
array of points, and a point itself in the case of a column with the
`point[]` type.
The attributes API gives us a reasonable way to have a proper
deprecation cycle for this change, so let's take advantage of it. If we
like this change, we can also add proper support for the other geometric
types (line, lseg, box, path, polygon, and circle), all of which are
just aliases for string today.
Fixes #20441
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The type from the column is never used, except when being passed to the
attributes API. While leaving the type on the column wasn't necessarily
a bad thing, I worry that it's existence there implies that it is
something which should be used.
During the design and implementation process of the attributes API,
there have been plenty of cases where getting the "right" type object
was hard, but I had easy access to the column objects. For any
contributor who isn't intimately familiar with the intents behind the
type casting system, grabbing the type from the column might easily seem
like the "correct" thing to do.
As such, the goal of this change is to express that the column is not
something that should be used for type casting. The only places that are
"valid" (at the time of this commit) uses of acquiring a type object
from the column are fixtures (as the YAML file is going to mirror the
database more closely than the AR object), and looking up the type
during schema detection to pass to the attributes API
Many of the failing tests were removed, as they've been made obsolete
over the last year. All of the PG column tests were testing nothing
beyond polymorphism. The Mysql2 tests were duplicating the mysql tests,
since they now share a column class.
The implementation is a little hairy, and slightly verbose, but it felt
preferable to going back to 20 constructor options for the columns. If
you are git blaming to figure out wtf I was thinking with them, and have
a better idea, go for it. Just don't use a type object for this.
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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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3729103e17e00494c8eae76e8a4ee1ac990d3450
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Overriding these methods may cause unexpected results since
"table_name=" does more then just setting the "@table_name".
ref: https://github.com/rails/rails/pull/18622#issuecomment-70874358
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Construction of relations can be a hotspot, we don't want to create one
of these in the constructor. This also allows us to do more expensive
things in the predicate builder's constructor, since it's created once
per AR::Base subclass
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We don't memoize the relation instance
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We don't know which attributes will or won't be used, and we don't want
to create massive bottlenecks at instantiation. Rather than doing *any*
iteration over types and values, we can lazily instantiate the object.
The lazy attribute hash should not fully implement hash, or subclass
hash at any point in the future. It is not meant to be a replacement,
but instead implement its own interface which happens to overlap.
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Nothing is directly using the columns for the default values anymore.
This step helps us get closer not not mutating the columns hash.
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It is internal use only. This is to avoid conflicting with users' method
names. Fixes #17458
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@column_names_with_alias, @dynamic_methods_hash, @time_zone_column_names, and @cached_time_zone
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Before this change, create_join_table would not remove the common prefix
in the join table name, unlike ActiveRecord::Reflections. A HABTM
between Music::Artist and Music::Record would use a table
music_artists_records, while create_join table would create
music_artists_music_records.
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