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Fix qpy custom ControlledGate with overloaded _define() (backport #8927) #8937

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merged 2 commits into from
Oct 18, 2022

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@mergify mergify bot commented Oct 18, 2022

This is an automatic backport of pull request #8927 done by Mergify.


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This commit fixes a bug in the QPY serialization of ControlledGate
subclasses that defined custom _define() methods. The _define() method
is the typical way to provide a custom definition in Gate classes. While
ControlledGate class provides an alternative interface that handles
custom control states at initialization, but the _define() interface is
still valid even if it doesn't account for this. In #8571 we updated the
QPY serialization code to use the _definition() method directly to
correctly handle the open control case. But this fix neglected the case
where people were providing definitions via the mechanism from Gate.
This commit fixes this assumption by ensuring we load the definition
that comes from _define() which will fix the serialization of these
custom subclasses.

Fixes #8794

Co-authored-by: Jake Lishman <jake.lishman@ibm.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
(cherry picked from commit 3fb8939)
@mergify mergify bot requested a review from a team as a code owner October 18, 2022 00:01
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@jakelishman jakelishman added Changelog: Bugfix Include in the "Fixed" section of the changelog automerge labels Oct 18, 2022
@jakelishman jakelishman added this to the 0.22.1 milestone Oct 18, 2022
@mergify mergify bot merged commit 6c4a3b6 into stable/0.22 Oct 18, 2022
@mergify mergify bot deleted the mergify/bp/stable/0.22/pr-8927 branch October 18, 2022 10:41
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3 participants