Bug SPAR-260: Error when dragging a work package to its children in work packages list

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Updated by Christophe Bliard about 1 year ago

### Steps to reproduce

* Unclear. Probably a larger work package graph with a deep hierarchy

* Artificial one using the console

* Create 439 (might be OS dependant) work packages where each work package is the child of the one created before (resulting in a tree with the breadth of 1) e.g. by using something like (in the console): `439.times { User.execute_as(author) { WorkPackage.new(subject: "A subject", project:, priority:, type:, status:, author:, parent: WorkPackage.last).save! } }`

* Go to the topmost work package of the just created ones.

* Open its date picker

* Click on "Automatic" scheduling mode

### What is the buggy behavior?

* Unclear. Probably, the scheduling failed.

* For the artificial one

* An error is shown

### What is the expected behavior?

* No error

### **Logs**

* [https://appsignal.com/openproject-gmbh/sites/63237184d2a5e463ef717e6e/exceptions/incidents/2038/samples/63237184d2a5e463ef717e6e-1433433535580424497317447155201](https://appsignal.com/openproject-gmbh/sites/63237184d2a5e463ef717e6e/exceptions/incidents/2038/samples/63237184d2a5e463ef717e6e-1433433535580424497317447155201)

* [https://appsignal.com/openproject-gmbh/sites/674718f1d2a5e4a7cb8b2298/exceptions/incidents/1024](https://appsignal.com/openproject-gmbh/sites/674718f1d2a5e4a7cb8b2298/exceptions/incidents/1024)

* [https://appsignal.com/openproject-gmbh/sites/674718f1d2a5e4a7cb8b2298/exceptions/incidents/969](https://appsignal.com/openproject-gmbh/sites/674718f1d2a5e4a7cb8b2298/exceptions/incidents/969)

* [https://appsignal.com/openproject-gmbh/sites/632371afd2a5e463ef717ecb/exceptions/incidents/35](https://appsignal.com/openproject-gmbh/sites/632371afd2a5e463ef717ecb/exceptions/incidents/35)

* [https://appsignal.com/openproject-gmbh/sites/632371afd2a5e463ef717ecb/exceptions/incidents/6640](https://appsignal.com/openproject-gmbh/sites/632371afd2a5e463ef717ecb/exceptions/incidents/6640)

* [https://appsignal.com/openproject-gmbh/sites/673c8be183eb67dcd6c4e75d/exceptions/incidents/1177](https://appsignal.com/openproject-gmbh/sites/673c8be183eb67dcd6c4e75d/exceptions/incidents/1177)

* https://appsignal.com/openproject-gmbh/sites/673c8be183eb67dcd6c4e75d/exceptions/incidents/1176

```text
app/services/work_packages/schedule_dependency.rb:122 Array#each
app/services/work_packages/schedule_dependency.rb:122 Enumerable#flat_map
app/services/work_packages/schedule_dependency.rb:122 WorkPackages::ScheduleDependency#descendants
app/services/work_packages/schedule_dependency.rb:122 block in WorkPackages::ScheduleDependency#descendants
app/services/work_packages/schedule_dependency.rb:122 Array#each
app/services/work_packages/schedule_dependency.rb:122 Enumerable#flat_map
app/services/work_packages/schedule_dependency.rb:122 WorkPackages::ScheduleDependency#descendants
app/services/work_packages/schedule_dependency.rb:122 block in WorkPackages::ScheduleDependency#descendants
app/services/work_packages/schedule_dependency.rb:122 Array#each
app/services/work_packages/schedule_dependency.rb:122 Enumerable#flat_map
app/services/work_packages/schedule_dependency.rb:122 WorkPackages::ScheduleDependency#descendants
app/services/work_packages/schedule_dependency.rb:122 block in WorkPackages::ScheduleDependency#descendants
app/services/work_packages/schedule_dependency.rb:122 Array#each
app/services/work_packages/schedule_dependency.rb:122 Enumerable#flat_map
app/services/work_packages/schedule_dependency.rb:122 WorkPackages::ScheduleDependency#descendants
app/services/work_packages/schedule_dependency.rb:122 block in WorkPackages::ScheduleDependency#descendants
app/services/work_packages/schedule_dependency.rb:122 Array#each
app/services/work_packages/schedule_dependency.rb:122 Enumerable#flat_map
app/services/work_packages/schedule_dependency.rb:122 WorkPackages::ScheduleDependency#descendants
app/services/work_packages/schedule_dependency.rb:122 block in WorkPackages::ScheduleDependency#descendants
app/services/work_packages/schedule_dependency.rb:122 Array#each
app/services/work_packages/schedule_dependency.rb:122 Enumerable#flat_map
app/services/work_packages/schedule_dependency.rb:122 WorkPackages::ScheduleDependency#descendants
app/services/work_packages/schedule_dependency.rb:122 block in WorkPackages::ScheduleDependency#descendants
app/services/work_packages/schedule_dependency.rb:122 Array#each
app/services/work_packages/schedule_dependency.rb:122 Enumerable#flat_map
app/services/work_packages/schedule_dependency.rb:122 WorkPackages::ScheduleDependency#descendants
app/services/work_packages/schedule_dependency.rb:122 block in WorkPackages::ScheduleDependency#descendants
app/services/work_packages/schedule_dependency.rb:122 Array#each
app/services/work_packages/schedule_dependency.rb:122 Enumerable#flat_map
app/services/work_packages/schedule_dependency.rb:122 WorkPackages::ScheduleDependency#descendants
app/services/work_packages/schedule_dependency.rb:122 block in WorkPackages::ScheduleDependency#descendants
...
```

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