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