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# frozen_string_literal: true
module Graphql
class FieldSelection
delegate :empty?, :blank?, :to_h, to: :selection
delegate :size, to: :paths
attr_reader :selection
def initialize(selection = {})
@selection = selection.to_h
end
def to_s
serialize_field_selection(selection)
end
def paths
selection.flat_map do |field, subselection|
paths_in([field], subselection)
end
end
private
def paths_in(path, leaves)
return [path] if leaves.nil?
leaves.to_a.flat_map do |k, v|
paths_in([k], v).map { |tail| path + tail }
end
end
def serialize_field_selection(hash, level = 0)
indent = ' ' * level
hash.map do |field, subselection|
if subselection.nil?
"#{indent}#{field}"
else
subfields = serialize_field_selection(subselection, level + 1)
"#{indent}#{field} {\n#{subfields}\n#{indent}}"
end
end.join("\n")
end
NO_SKIP = ->(_name, _field) { false }
def self.select_fields(type, skip = NO_SKIP, max_depth = 3)
return new if max_depth <= 0 || !type.kind.fields?
new(type.fields.flat_map do |name, field|
next [] if skip[name, field]
inspected = ::Graphql::FieldInspection.new(field)
singular_field_type = inspected.type
if inspected.nested_fields?
subselection = select_fields(singular_field_type, skip, max_depth - 1)
next [] if subselection.empty?
[[name, subselection.to_h]]
else
[[name, nil]]
end
end)
end
end
end
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