102 lines
2.7 KiB
Ruby
102 lines
2.7 KiB
Ruby
# frozen_string_literal: true
|
|
|
|
# A collection of events to display in an event list.
|
|
#
|
|
# An EventCollection is meant to be used for displaying events to a user (e.g.
|
|
# in a controller), it's not suitable for building queries that are used for
|
|
# building other queries.
|
|
class EventCollection
|
|
include Gitlab::Utils::StrongMemoize
|
|
|
|
# To prevent users from putting too much pressure on the database by cycling
|
|
# through thousands of events we put a limit on the number of pages.
|
|
MAX_PAGE = 10
|
|
|
|
# projects - An ActiveRecord::Relation object that returns the projects for
|
|
# which to retrieve events.
|
|
# filter - An EventFilter instance to use for filtering events.
|
|
def initialize(projects, limit: 20, offset: 0, filter: nil, groups: nil)
|
|
@projects = projects
|
|
@limit = limit
|
|
@offset = offset
|
|
@filter = filter
|
|
@groups = groups
|
|
end
|
|
|
|
# Returns an Array containing the events.
|
|
def to_a
|
|
return [] if current_page > MAX_PAGE
|
|
|
|
relation = if groups
|
|
project_and_group_events
|
|
else
|
|
project_events
|
|
end
|
|
|
|
relation = paginate_events(relation)
|
|
relation.with_associations.to_a
|
|
end
|
|
|
|
def all_project_events
|
|
Event.from_union([project_events]).recent
|
|
end
|
|
|
|
private
|
|
|
|
def project_events
|
|
in_operator_optimized_relation('project_id', projects)
|
|
end
|
|
|
|
def group_events
|
|
in_operator_optimized_relation('group_id', groups)
|
|
end
|
|
|
|
def project_and_group_events
|
|
Event.from_union([project_events, group_events]).recent
|
|
end
|
|
|
|
def in_operator_optimized_relation(parent_column, parents)
|
|
scope = filtered_events
|
|
array_scope = parents.select(:id)
|
|
array_mapping_scope = -> (parent_id_expression) { Event.where(Event.arel_table[parent_column].eq(parent_id_expression)).reorder(id: :desc) }
|
|
finder_query = -> (id_expression) { Event.where(Event.arel_table[:id].eq(id_expression)) }
|
|
|
|
Gitlab::Pagination::Keyset::InOperatorOptimization::QueryBuilder
|
|
.new(
|
|
scope: scope,
|
|
array_scope: array_scope,
|
|
array_mapping_scope: array_mapping_scope,
|
|
finder_query: finder_query
|
|
)
|
|
.execute
|
|
end
|
|
|
|
def filtered_events
|
|
@filter ? @filter.apply_filter(base_relation) : base_relation
|
|
end
|
|
|
|
def paginate_events(events)
|
|
events.limit(@limit).offset(@offset)
|
|
end
|
|
|
|
def base_relation
|
|
# We want to have absolute control over the event queries being built, thus
|
|
# we're explicitly opting out of any default scopes that may be set.
|
|
Event.unscoped.recent
|
|
end
|
|
|
|
def current_page
|
|
(@offset / @limit) + 1
|
|
end
|
|
|
|
def projects
|
|
@projects.except(:order)
|
|
end
|
|
|
|
def groups
|
|
strong_memoize(:groups) do
|
|
groups.except(:order) if @groups
|
|
end
|
|
end
|
|
end
|