125 lines
4.5 KiB
Ruby
125 lines
4.5 KiB
Ruby
module BodyTracking
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module ItemsWithQuantities
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QUANTITY_DOMAINS = {
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Measurement => :measurement,
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Ingredient => :diet
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}
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VALUE_COLUMNS = {
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Measurement => :value,
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Ingredient => :amount
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}
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def filter(filters, requested_q = nil)
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items = all.where(filters[:scope])
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if filters[:name].present?
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items = items.where("name LIKE ?", "%#{filters[:name]}%")
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end
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if filters[:visibility].present?
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items = items.where(hidden: filters[:visibility] == "1" ? false : true)
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end
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project = proxy_association.owner
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domain = QUANTITY_DOMAINS[proxy_association.klass]
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formula_q = if filters[:formula].present?
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project.quantities.new(name: 'Filter formula',
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formula_attributes: filters[:formula],
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domain: domain)
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end
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apply_formula = formula_q.present? && formula_q.valid?
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result =
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if requested_q || apply_formula
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computed = items.compute_quantities(requested_q, apply_formula && formula_q)
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requested_q ? computed : [computed[0]]
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else
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[items]
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end
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result.push(formula_q)
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end
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def compute_quantities(requested_q, filter_q = nil)
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items = all
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requested_q ||= Quantity.none
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unchecked_q = requested_q.map { |q| [q, nil] }
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unchecked_q << [filter_q, nil] if filter_q
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item_class = proxy_association.klass
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subitem_type = item_class.nested_attributes_options.keys.first.to_s
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subitem_reflection = item_class.reflections[subitem_type]
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subitem_class = subitem_reflection.klass
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subitems_scope = subitem_class.where(subitem_reflection.options[:inverse_of] => items)
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subitems = Hash.new { |h,k| h[k] = {} }
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subitems_scope.includes(:quantity, :unit).order('quantities.lft').each do |s|
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item_id = s.send(subitem_reflection.foreign_key)
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subitem_value = s.send(VALUE_COLUMNS[item_class])
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subitems[s.quantity][item_id] = [subitem_value, s.unit]
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end
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extra_q = subitems.keys - requested_q
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completed_q = {}
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# FIXME: loop should finish unless there is circular dependency in formulas
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# for now we don't guard against that
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while !unchecked_q.empty?
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q, deps = unchecked_q.shift
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# quantity not computable: no formula/invalid formula (syntax error/runtime error)
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# or not requiring calculation/computed
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if !q.formula || q.formula.errors.any? || !q.formula.valid? ||
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(subitems[q].length == items.count)
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completed_q[q] = subitems.delete(q) { {} }
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completed_q[q].default = [nil, nil]
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next
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end
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# quantity with formula requires refresh of dependencies availability
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if deps.nil? || !deps.empty?
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deps ||= q.formula.quantities.clone
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deps.reject! { |d| completed_q.has_key?(d) }
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deps.each { |d| unchecked_q << [d, nil] unless unchecked_q.index { |u| u[0] == d } }
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end
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# quantity with formula has all dependencies satisfied, requires calculation
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if deps.empty?
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output_ids = items.select { |i| subitems[q][i.id].nil? }.map(&:id)
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input_q = q.formula.quantities
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inputs = input_q.map do |i_q|
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values = completed_q[i_q].values_at(*output_ids)
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values.map! { |v, u| [v || BigDecimal(0), u] } if q.formula.zero_nil
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[i_q, values]
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end
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begin
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calculated = q.formula.calculate(inputs.to_h)
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rescue Exception => e
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output_ids.each { |oid| subitems[q][oid] = [BigDecimal::NAN, nil] }
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q.formula.errors.add(
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:code, :computation_failed,
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{
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quantity: q.name,
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description: e.message,
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count: output_ids.size == subitems[q].size ? 'all' : output_ids.size
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}
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)
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else
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output_ids.each_with_index { |oid, idx| subitems[q][oid] = calculated[idx] }
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end
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unchecked_q.unshift([q, deps])
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next
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end
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# quantity still has unsatisfied dependencies, move to the end of queue
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unchecked_q << [q, deps]
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end
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all_q = subitems.merge(completed_q)
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[
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filter_q ? items.to_a.keep_if { |i| all_q[filter_q][i.id][0] } : items,
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items.map { |i| requested_q.map { |q| [q, all_q[q][i.id]] } },
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items.map { |i| extra_q.map { |q| [q, all_q[q][i.id]] } }
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]
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end
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end
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end
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