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Include self and ancestors in result

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cryptogopher 2025-01-09 15:59:18 +01:00
parent c7f16514d2
commit 1e7ef75e8b
1 changed files with 13 additions and 2 deletions
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15
app/models/quantity.rb
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@ -58,12 +58,23 @@ class Quantity < ApplicationRecord
parent_id.nil?
end
# Return: record, its ancestors and succesive record in order of appearance,
# including :depth attribute. Used for table view reload.
def successive
quantities = Quantity.arel_table
ancestors = Arel::Table.new('ancestors')
Quantity.with(
quantities: user.quantities.ordered.select(
ancestors: user.quantities.ordered.select(
Arel::Nodes::NamedFunction.new('LAG', [quantities[:id]]).over.as('lag_id')
)
).where(quantities[:lag_id].eq(id)).first
)
.with_recursive(quantities: [
Arel::SelectManager.new.project(ancestors[Arel.star]).from(ancestors)
.where(ancestors[:id].eq(id).or(ancestors[:lag_id].eq(id))),
Arel::SelectManager.new.project(ancestors[Arel.star]).from(ancestors)
.join(quantities).on(quantities[:parent_id].eq(ancestors[:id]))
.where(quantities[:lag_id].not_eq(id))
]).order(quantities[:path])
# return: .first == self ? nul, ancestors : ancestors.pop, ancestors
end
end