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@MaxLap MaxLap commented Jul 13, 2017

Right now, unscope sometimes doesn't skip a bind as it iterates over the different conditions. For example, when that bind is used as part of an OR clause. As a result, the unscope will remove the wrong bind.

For example:

Post.where(id: 1).or(Post.where(id: 2)).where(foo: 3).unscope(where: :foo).to_sql
# Currently:
#     SELECT "posts".* FROM "posts" WHERE ("posts"."id" = 2 OR "posts"."id" = 3)
# With fix:
#     SELECT "posts".* FROM "posts" WHERE ("posts"."id" = 1 OR "posts"."id" = 2)

I propose this bugfix gets also backported to Rails 5.1. Rails 5.0 had a different version that was probably more buggy, since a bugfix was applied to this same function as part of 5.1, making it harder to backport to 5.0.

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…sometimes

Post.where(id: 1).or(Post.where(id: 2)).where(foo: 3).unscope(where: :foo).where_clause.binds.map(&:value)
Would return [2, 3] instead of the expected [1,2]
@sgrif sgrif merged commit a12ce5d into rails:master Jul 18, 2017
bogdanvlviv added a commit to bogdanvlviv/rails that referenced this pull request Mar 18, 2018
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Related to rails#32222, rails#32222 (comment).
Follow up a489cc8.
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