Defect #15058
Project authorization EnabledModule N+1 queries
| Status: | Closed | Start date: | ||
|---|---|---|---|---|
| Priority: | Normal | Due date: | ||
| Assignee: | - | % Done: | 0% | |
| Category: | Code cleanup/refactoring | |||
| Target version: | 2.4.0 | |||
| Resolution: | Fixed | Affected version: |
Description
There's a problem with project authorization that causes N+1 queries (one per project in @projects).
In ApplicationController#authorize redmine checks authorization on @project or @projects. This triggers the code in Project#allowed_permissions which calls enabled_modules.pluck(:name).
The problem here is that pluck circumvents preloading, so no matter wether we do @projects = Project.includes(:enabled_modules).where(conditions) in a controller, it will still trigger one extra query per project.
Given that the EnableModule model is tiny, this could be prevented by using enabled_modules.map(&:name) instead.
Associated revisions
Avoid a query if enabled_modules association is already loaded (#15058).
History
#1
Updated by Jean-Philippe Lang almost 8 years ago
- Category changed from Database to Code cleanup/refactoring
- Status changed from New to Closed
- Resolution set to Fixed
Fixed in r12228, #pluck won't be called is the association is preloaded.
#2
Updated by Jean-Philippe Lang almost 8 years ago
- Target version set to 2.4.0
#3
Updated by Felix Bünemann almost 8 years ago
Nice solution, I didn't know about loaded? until now.