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# frozen_string_literal: true
module LooksAhead
extend ActiveSupport::Concern
included do
extras [:lookahead]
attr_accessor :lookahead
end
def resolve(**args)
self.lookahead = args.delete(:lookahead)
resolve_with_lookahead(**args)
end
def apply_lookahead(query)
all_preloads = (unconditional_includes + filtered_preloads).uniq
return query if all_preloads.empty?
query.preload(*all_preloads) # rubocop: disable CodeReuse/ActiveRecord
end
private
def unconditional_includes
[]
end
def preloads
{}
end
def nested_preloads
{}
end
def filtered_preloads
nodes = node_selection
return [] unless nodes
selected_fields = nodes.selections.map(&:name)
root_level_preloads = preloads_from_node_selection(selected_fields, preloads)
root_level_preloads + nested_filtered_preloads(nodes, selected_fields)
end
def nested_filtered_preloads(nodes, selected_root_fields)
return [] if nested_preloads.empty?
nested_preloads.each_with_object([]) do |(root_field, fields), result|
next unless selected_root_fields.include?(root_field)
selected_fields = nodes.selection(root_field).selections.map(&:name)
result << preloads_from_node_selection(selected_fields, fields)
end.flatten
end
def preloads_from_node_selection(selected_fields, fields)
fields.each_with_object([]) do |(field, requirements), result|
result << requirements if selected_fields.include?(field)
end.flatten
end
def node_selection
return unless lookahead
if lookahead.selects?(:nodes)
lookahead.selection(:nodes)
elsif lookahead.selects?(:edges)
lookahead.selection(:edges).selection(:node)
end
end
end
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