• Douwe Maan's avatar
    Merge branch 'fix-404-labels-in-todos' into 'master' · 4cd2d468
    Douwe Maan authored
    Fix 404 page when viewing TODOs that contain milestones or labels in different projects
    
    A user viewing the TODOs page will see a 404 if there are mentioned milestones or labels in multiple different projects. This is likely a caching bug and only occurs
    when Markdown rendering occurs across multiple projects, which is why it's so tricky to reproduce. This is what I think is happening:
        
    1. LabelReferenceFilter#references_in encounters label ~X for ProjectA and finds the label in the DB as id = 1.
    2. LabelReferenceFilter.references_in yields [1, 'X', nil, ...]
    3. Since project_ref is nil, AbstractReferenceFilter#project_from_ref_cache caches nil => ProjectA.
    4. LabelReferenceFilter#references_in encounters label ~Y for ProjectB and finds the label in the DB as id = 2.
    5. LabelReferenceFilter.references_in yields [2, 'Y', nil, ...]
    6. AbstractReferenceFilter#project_from_ref_cache lookups nil and returns ProjectA. It was supposed to be ProjectB.
    7. A is the wrong project, so the label lookup fails.
       
    This MR expands the `project_ref` to the right value as soon as we have it to avoid this caching bug.
        
    Closes #17898
    
    
    See merge request !4312
    4cd2d468
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