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[WIP] Add option on how to handle orphans when arranging nodes #661

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[WIP] Add option on how to handle orphans when arranging nodes #661

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19 changes: 15 additions & 4 deletions lib/ancestry/class_methods.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -38,16 +38,27 @@ def arrange options = {}
# arranges array of nodes to a hierarchical hash
#
# @param nodes [Array[Node]] nodes to be arranged
# @param orphan_strategy [Symbol] :rootify or :destroy (default: :rootify)
# @returns Hash{Node => {Node => {}, Node => {}}}
# If a node's parent is not included, the node will be included as if it is a top level node
def arrange_nodes(nodes)
def arrange_nodes(nodes, orphan_strategy: :rootify)
node_ids = Set.new(nodes.map(&:id))
index = Hash.new { |h, k| h[k] = {} }

nodes.each_with_object({}) do |node, arranged|
children = index[node.id]
index[node.parent_id][node] = children
arranged[node] = children unless node_ids.include?(node.parent_id)
index[node.parent_id][node] = children = index[node.id]
if node.parent_id.nil?
arranged[node] = children
elsif !node_ids.include?(node.parent_id)
case orphan_strategy
# when :destroy # All children are destroyed as well (default)
# when :adopt then raise ArgumentError, "Not Implemented"
when :rootify
arranged[node] = children
when :restrict
raise Ancestry::AncestryException.new(I18n.t("ancestry.cannot_delete_descendants"))
end
end
end
end

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