method

precompile_filters

v7.1.3.2 - Show latest stable - 0 notes - Class: ParameterFilter

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What's this?

precompile_filters(filters) public

Precompiles an array of filters that otherwise would be passed directly to #initialize. Depending on the quantity and types of filters, precompilation can improve filtering performance, especially in the case where the ParameterFilter instance itself cannot be retained (but the precompiled filters can be retained).

filters = [/foo/, :bar, "nested.baz", /nested\.qux/]

precompiled = ActiveSupport::ParameterFilter.precompile_filters(filters)
# => [/(?-mix:foo)|(?i:bar)/, /(?i:nested\.baz)|(?-mix:nested\.qux)/]

ActiveSupport::ParameterFilter.new(precompiled)

Show source

# File activesupport/lib/active_support/parameter_filter.rb, line 55
    def self.precompile_filters(filters)
      filters, patterns = filters.partition { |filter| filter.is_a?(Proc) }

      patterns.map! do |pattern|
        pattern.is_a?(Regexp) ? pattern : "(?i:#{Regexp.escape pattern.to_s})"
      end

      deep_patterns = patterns.extract! { |pattern| pattern.to_s.include?("\\.") }

      filters << Regexp.new(patterns.join("|")) if patterns.any?
      filters << Regexp.new(deep_patterns.join("|")) if deep_patterns.any?

      filters
    end

precompile_filters

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