| Commit message (Collapse) | Author | Age | Files | Lines |
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This caused a bug with the new associations implementation, because now
association conditions are represented as Arel nodes internally right up
to when the whole thing gets turned to SQL.
In Rails 3.2, association conditions get turned to raw SQL early on,
which prevents Relation#merge from interfering.
The current implementation was buggy when a default_scope existed on the
target model, since we would basically end up doing:
default_scope.merge(association_scope)
If default_scope contained a where(foo: 'a') and association_scope
contained a where(foo: 'b').where(foo: 'c') then the merger would see
that the same column is representated on both sides of the merge and
collapse the wheres to all but the last: where(foo: 'c')
Now, the RHS of the merge is left alone.
Fixes #8990
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Before:
Calculating -------------------------------------
ar 87 i/100ms
-------------------------------------------------
ar 823.4 (±11.8%) i/s - 4089 in 5.070234s
After:
Calculating -------------------------------------
ar 88 i/100ms
-------------------------------------------------
ar 894.1 (±3.9%) i/s - 4488 in 5.028161s
Same test as 3a6dfca7f5f5bd45cea2f6ac348178e72423e1d5
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before:
Calculating -------------------------------------
ar 83 i/100ms
-------------------------------------------------
ar 832.1 (±4.0%) i/s - 4233 in 5.096611s
after:
Calculating -------------------------------------
ar 87 i/100ms
-------------------------------------------------
ar 839.0 (±9.3%) i/s - 4176 in 5.032782s
Benchmark:
require 'config/environment'
require 'benchmark/ips'
GC.disable
unless User.find_by_login('tater')
u = User.new
u.login = 'tater'
u.save!
end
def active_record
user = User.find_by_login('tater')
starred = user.starred_items.count
end
active_record
Benchmark.ips do |x|
x.report("ar") { active_record }
end
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This is a real fix (as compared to the band-aid in b127d86c), which uses
the recently-added equality methods for ARel nodes. It has the side
benefit of simplifying the merge code a bit.
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This is at best a band-aid for a more proper fix, since it won't truly
handle the removal of the previous equality condition of these other
nodes. I'm planning to put in some work on ARel toward supporting that
goal.
Related: rails/arel#130, ernie/squeel#153, ernie/squeel#156
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Record.from("(#{sub_query.to_sql})") -> Record.from(sub_query)
Record.from("(#{sub_query.to_sql}) a") -> Record.from(sub_query, :a)
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armstrjare/active_record_relation_keep_association_join_context_on_merge"
This reverts commit dcd04e76179611a9db28c9e391aa7d6c2a5b046a, reversing
changes made to 58a49875df63729f07a9a81d1ee349087d258df5.
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