Fix merge error when Equality LHS is non-attribute
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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@ -97,11 +97,14 @@ def merged_wheres
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merged_wheres = relation.where_values + values[:where]
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unless relation.where_values.empty?
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# Remove duplicates, last one wins.
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# Remove duplicate ARel attributes. Last one wins.
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seen = Hash.new { |h,table| h[table] = {} }
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merged_wheres = merged_wheres.reverse.reject { |w|
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nuke = false
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if w.respond_to?(:operator) && w.operator == :==
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# We might have non-attributes on the left side of equality nodes,
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# so we need to make sure they quack like an attribute.
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if w.respond_to?(:operator) && w.operator == :== &&
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w.left.respond_to?(:relation)
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name = w.left.name
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table = w.left.relation.name
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nuke = seen[table][name]
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@ -668,6 +668,22 @@ def test_relation_merging
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assert_equal [developers(:poor_jamis)], dev_with_count.to_a
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end
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def test_relation_merging_with_arel_equalities_keeps_last_equality
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devs = Developer.where(Developer.arel_table[:salary].eq(80000)).merge(
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Developer.where(Developer.arel_table[:salary].eq(9000))
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)
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assert_equal [developers(:poor_jamis)], devs.to_a
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end
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def test_relation_merging_with_arel_equalities_with_a_non_attribute_left_hand_ignores_non_attributes_when_discarding_equalities
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salary_attr = Developer.arel_table[:salary]
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devs = Developer.where(salary_attr.eq(80000)).merge(
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Developer.where(salary_attr.eq(9000)).
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where(Arel::Nodes::NamedFunction.new('abs', [salary_attr]).eq(9000))
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)
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assert_equal [developers(:poor_jamis)], devs.to_a
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end
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def test_relation_merging_with_eager_load
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relations = []
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relations << Post.order('comments.id DESC').merge(Post.eager_load(:last_comment)).merge(Post.all)
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