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Replace additional joins with NOT EXISTS subquery

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This commit is contained in:
cryptogopher 2024-11-14 02:50:53 +01:00
parent 4c09989788
commit 7234d60afc
1 changed files with 14 additions and 12 deletions
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26
app/models/unit.rb
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@ -18,20 +18,22 @@ class Unit < ApplicationRecord
scope :defaults_diff, ->{ scope :defaults_diff, ->{
other_units = Unit.arel_table.alias('other_units') other_units = Unit.arel_table.alias('other_units')
other_bases_units = Unit.arel_table.alias('other_bases_units') other_bases_units = Unit.arel_table.alias('other_bases_units')
constraints = other_bases_units[:id].eq(other_units[:base_id])
.and(other_bases_units[:symbol].eq(Arel::Table.new(:bases_units)[:symbol]))
.and(other_units[:symbol].eq(arel_table[:symbol]))
.and(other_units[:user_id].not_eq(arel_table[:user_id]))
# add 'portable' fields (import on !default == export) to select
with_defaults with_defaults
.joins( .where("NOT EXISTS (?)",
arel_table.create_join( Unit.select(1).from(other_units).joins(
arel_table.grouping([other_units, other_bases_units]), arel_table.create_join(
arel_table.create_on(constraints), other_bases_units,
Arel::Nodes::OuterJoin arel_table.create_on(other_bases_units[:id].eq(other_units[:base_id])),
).to_sql Arel::Nodes::OuterJoin
) )
.where({other_units: {id: nil}}) ).where(
other_bases_units[:symbol].eq(Arel::Table.new(:bases_units)[:symbol])
.and(other_units[:symbol].eq(arel_table[:symbol]))
.and(other_units[:user_id].not_eq(arel_table[:user_id]))
)
)
} }
scope :ordered, ->{ scope :ordered, ->{
left_outer_joins(:base) left_outer_joins(:base)