82 lines
2.7 KiB
Ruby
82 lines
2.7 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module SQL
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module Pattern
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extend ActiveSupport::Concern
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MIN_CHARS_FOR_PARTIAL_MATCHING = 3
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REGEX_QUOTED_WORD = /(?<=\A| )"[^"]+"(?= |\z)/.freeze
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class_methods do
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def fuzzy_search(query, columns, use_minimum_char_limit: true)
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matches = columns.map do |col|
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fuzzy_arel_match(col, query, use_minimum_char_limit: use_minimum_char_limit)
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end.compact.reduce(:or)
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where(matches)
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end
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def to_pattern(query, use_minimum_char_limit: true)
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if partial_matching?(query, use_minimum_char_limit: use_minimum_char_limit)
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"%#{sanitize_sql_like(query)}%"
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else
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sanitize_sql_like(query)
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end
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end
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def min_chars_for_partial_matching
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MIN_CHARS_FOR_PARTIAL_MATCHING
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end
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def partial_matching?(query, use_minimum_char_limit: true)
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return true unless use_minimum_char_limit
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query.length >= min_chars_for_partial_matching
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end
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# column - The column name / Arel column to search in.
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# query - The text to search for.
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# lower_exact_match - When set to `true` we'll fall back to using
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# `LOWER(column) = query` instead of using `ILIKE`.
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def fuzzy_arel_match(column, query, lower_exact_match: false, use_minimum_char_limit: true)
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query = query.squish
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return unless query.present?
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arel_column = column.is_a?(Arel::Attributes::Attribute) ? column : arel_table[column]
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words = select_fuzzy_words(query, use_minimum_char_limit: use_minimum_char_limit)
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if words.any?
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words.map { |word| arel_column.matches(to_pattern(word, use_minimum_char_limit: use_minimum_char_limit)) }.reduce(:and)
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else
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# No words of at least 3 chars, but we can search for an exact
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# case insensitive match with the query as a whole
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if lower_exact_match
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Arel::Nodes::NamedFunction
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.new('LOWER', [arel_column])
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.eq(query)
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else
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arel_column.matches(sanitize_sql_like(query))
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end
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end
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end
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def select_fuzzy_words(query, use_minimum_char_limit: true)
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quoted_words = query.scan(REGEX_QUOTED_WORD)
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query = quoted_words.reduce(query) { |q, quoted_word| q.sub(quoted_word, '') }
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words = query.split
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quoted_words.map! { |quoted_word| quoted_word[1..-2] }
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words.concat(quoted_words)
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words.select { |word| partial_matching?(word, use_minimum_char_limit: use_minimum_char_limit) }
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end
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end
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end
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end
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end
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