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# 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
attr_reader :filter
# 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 || EventFilter.new(EventFilter::ALL)
@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, Project)
end
def group_events
in_operator_optimized_relation('group_id', groups, Namespace)
end
def project_and_group_events
if EventFilter::PROJECT_ONLY_EVENT_TYPES.include?(filter.filter)
project_events
else
Event.from_union([project_events, group_events]).recent
end
end
def in_operator_optimized_relation(parent_column, parents, parent_model)
array_data = {
scope_ids: parents.pluck(:id),
scope_model: parent_model,
mapping_column: parent_column
}
query_builder_params = filter.in_operator_query_builder_params(array_data)
Gitlab::Pagination::Keyset::InOperatorOptimization::QueryBuilder
.new(**query_builder_params)
.execute
.limit(@limit + @offset)
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
EventCollection.prepend_mod
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