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A common source of bugs and code bloat within Active Record has been the
need for us to maintain the list of bind values separately from the AST
they're associated with. This makes any sort of AST manipulation
incredibly difficult, as any time we want to potentially insert or
remove an AST node, we need to traverse the entire tree to find where
the associated bind parameters are.
With this change, the bind parameters now live on the AST directly.
Active Record does not need to know or care about them until the final
AST traversal for SQL construction. Rather than returning just the SQL,
the Arel collector will now return both the SQL and the bind parameters.
At this point the connection adapter will have all the values that it
had before.
A bit of this code is janky and something I'd like to refactor later. In
particular, I don't like how we're handling associations in the
predicate builder, the special casing of `StatementCache::Substitute` in
`QueryAttribute`, or generally how we're handling bind value replacement
in the statement cache when prepared statements are disabled.
This also mostly reverts #26378, as it moved all the code into a
location that I wanted to delete.
/cc @metaskills @yahonda, this change will affect the adapters
Fixes #29766.
Fixes #29804.
Fixes #26541.
Close #28539.
Close #24769.
Close #26468.
Close #26202.
There are probably other issues/PRs that can be closed because of this
commit, but that's all I could find on the first few pages.
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This reverts commit 3420a14590c0e6915d8b6c242887f74adb4120f9, reversing
changes made to afb66a5a598ce4ac74ad84b125a5abf046dcf5aa.
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Passing `klass.connection` is redundant because `AssociationScope` is
passed an association itself and an association has `klass`.
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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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The column is primarily used for type casting, which we're trying to
separate from the idea of a column. Since what we really need is the
combination of a name, type, and value, let's use the object that we
already have to represent that concept, rather than this tuple. No
consumers of the bind values have been changed, only the producers
(outside of tests which care too much about internals). This is
*finally* possible since the bind values are now produced from a
reasonable number of lcoations.
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The only place it was accessed was in tests. Many of them have another
way that they can test their behavior, that doesn't involve reaching
into internals as far as they did. `AssociationScopeTest` is testing a
situation where the where clause would have one bind param per
predicate, so it can just ignore the predicates entirely. The where
chain test was primarly duplicating the logic tested on `WhereClause`
directly, so I instead just make sure it calls the appropriate method
which is fully tested in isolation.
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* master: (311 commits)
Add a missing changelog entry for #13981 and #14035
Revert "Fixed plugin_generator test"
implements new option :month_format_string for date select helpers [Closes #13618]
add factory methods for empty alias trackers
guarantee a list in the alias tracker so we can remove a conditional
stop exposing table_joins
make most parameters to the AliasTracker required
make a singleton for AssociationScope
pass the association and connection to the scope method
pass the tracker down the stack and construct it in the scope method
clean up add_constraints signature
remove the reflection delegate
remove klass delegator
remove railties changes. fixes #14054
remove chain delegate
remove scope_chain delegate
Add verb to sanitization note
fix path shown in mailer's templates
updated Travis build status image url
fix guide active_support_core_extensions. add Note to String#indent [ci skip]
...
Conflicts:
activerecord/lib/active_record/associations/join_dependency.rb
activerecord/test/cases/associations/association_scope_test.rb
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AssociationScope no longer maintains state, so we're safe to keep a
singleton and save on GC time
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