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27 lines
811 B
27 lines
811 B
6 years ago
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module AcceptsNestedAttributesHelper
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extend ActiveSupport::Concern
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def build_accepts_nested_attributes(obj, relations, data)
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# 新记录，全部为创建
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return data if obj.new_record?
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# 更新时，需要处理删除数据
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old_ids = relations.loaded? ? relations.map(&:id) : relations.pluck(:id)
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new_ids =
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data.map do |item|
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yield(item) if block_given?
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# 处理参数中错误的ID
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item[:id] = item[:id].to_i
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item[:id] = nil if item[:id].zero? || !old_ids.include?(item[:id])
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item[:id]
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end
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new_ids.compact!
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# 被删除的子项ID数组
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destroy_ids = old_ids - new_ids
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destroy_attributes = destroy_ids.map { |id| { id: id, _destroy: true } }
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data.concat(destroy_attributes)
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end
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end
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