d29347220c
This changes ProjectsFinder#init_collection so it no longer relies on a
UNION. For example, to get starred projects of a user we used to run:
SELECT projects.*
FROM projects
WHERE projects.pending_delete = 'f'
AND (
projects.id IN (
SELECT projects.id
FROM projects
INNER JOIN users_star_projects
ON users_star_projects.project_id = projects.id
INNER JOIN project_authorizations
ON projects.id = project_authorizations.project_id
WHERE projects.pending_delete = 'f'
AND project_authorizations.user_id = 1
AND users_star_projects.user_id = 1
UNION
SELECT projects.id
FROM projects
INNER JOIN users_star_projects
ON users_star_projects.project_id = projects.id
WHERE projects.visibility_level IN (20, 10)
AND users_star_projects.user_id = 1
)
)
ORDER BY projects.id DESC;
With these changes the above query is turned into the following instead:
SELECT projects.*
FROM projects
INNER JOIN users_star_projects
ON users_star_projects.project_id = projects.id
WHERE projects.pending_delete = 'f'
AND (
EXISTS (
SELECT 1
FROM project_authorizations
WHERE project_authorizations.user_id = 1
AND (project_id = projects.id)
)
OR projects.visibility_level IN (20,10)
)
AND users_star_projects.user_id = 1
ORDER BY projects.id DESC;
This query in turn produces a better execution plan and takes less time,
though the difference is only a few milliseconds (this however depends
on the amount of data involved and additional conditions that may be
added).
|
||
|---|---|---|
| .. | ||
| README.md | ||
| access_requests_finder.rb | ||
| branches_finder.rb | ||
| contributed_projects_finder.rb | ||
| environments_finder.rb | ||
| events_finder.rb | ||
| group_finder.rb | ||
| group_members_finder.rb | ||
| group_projects_finder.rb | ||
| groups_finder.rb | ||
| issuable_finder.rb | ||
| issues_finder.rb | ||
| joined_groups_finder.rb | ||
| labels_finder.rb | ||
| members_finder.rb | ||
| merge_requests_finder.rb | ||
| milestones_finder.rb | ||
| move_to_project_finder.rb | ||
| notes_finder.rb | ||
| personal_access_tokens_finder.rb | ||
| personal_projects_finder.rb | ||
| pipeline_schedules_finder.rb | ||
| pipelines_finder.rb | ||
| projects_finder.rb | ||
| snippets_finder.rb | ||
| tags_finder.rb | ||
| todos_finder.rb | ||
| union_finder.rb | ||
| users_finder.rb | ||
README.md
Finders
This type of classes responsible for collection items based on different conditions. To prevent lookup methods in models like this:
class Project
def issues_for_user_filtered_by(user, filter)
# A lot of logic not related to project model itself
end
end
issues = project.issues_for_user_filtered_by(user, params)
Better use this:
issues = IssuesFinder.new(project, user, filter).execute
It will help keep models thiner.