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62 lines
1.7 KiB
Ruby
62 lines
1.7 KiB
Ruby
module RenamingUtil
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# Rename the given record in memory (without saving it!)
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# by trying various combinations of appending number/s to the
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# end of its name (provided by the name column).
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#
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# WARNING: Other record fields MUST BE valid before calling
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# this function, as it uses the ActiveRecord.valid? method.
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#
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# WARNING: The maximum length validations on the provided name_col
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# MUST BE at least 10 characters, otherwise this function can
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# stir some odd behaviour.
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def rename_record(record, name_col)
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clazz = record.class
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prev_name = record[name_col]
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# Skip already valid records
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if record.valid?
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return
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end
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# Get the max. length validation, if it exist
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# IF MAX_LENGTH IS VERY LOW, this code here could
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# potentially cause trouble. Let's hope max_length is always 10+
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max_length = Constants::INFINITY
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clazz
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.validators_on(name_col)
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.select{ |v| v.class == ActiveModel::Validations::LengthValidator }
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.each do |v|
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max = v.options[:maximum]
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if max.present? && max < max_length
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max_length = max
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end
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end
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# First, check if name is simply too long
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if prev_name.length > max_length then
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record[name_col] = prev_name[0..(max_length - 4)] + "..."
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if record.valid?
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return
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end
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end
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# Now, start renaming (we try 100 tries)
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cntr = 0
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while (record.invalid? && cntr < 100) do
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cntr += 1
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suffix = " (#{cntr})"
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if prev_name.length + suffix.length > max_length
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record[name_col] =
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prev_name[0..(max_length - 4 - suffix.length)] + suffix
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else
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record[name_col] = prev_name + suffix
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end
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end
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return record.valid?
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end
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end
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