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  • Yorick Peterse's avatar
    Preload pipeline data for project pipelines · 3c64ad01bc13
    Yorick Peterse authored
    When displaying the pipelines of a project we now preload the following
    data:
    
    1. Authors of the commits that belong to these pipelines
    2. The number of warnings per pipeline, which is used by
       Ci::Pipeline#has_warnings?
    
    == Commit Authors
    
    Previously this data was queried for every Commit separately, leading to
    20 SQL queries being executed in the worst case. With an average of 3 to
    5 milliseconds per SQL query this could result in 100 milliseconds being
    spent in _just_ getting Commit authors.
    
    To preload this data Commit#author now uses BatchLoader (through
    Commit#lazy_author), and a separate module
    Gitlab::Ci::Pipeline::Preloader is used to ensure all authors are loaded
    before they are used.
    
    == Number of warnings
    
    This changes Ci::Pipeline#has_warnings? so it supports preloading of the
    number of warnings per pipeline. This removes the need for executing a
    COUNT(*) query for every pipeline just to see if it has any warnings or
    not.
    3c64ad01bc13