Class: SearchSyntax::RansackTransformer

Inherits:
Object
  • Object
show all
Defined in:
lib/search_syntax/ransack_transformer.rb

Constant Summary collapse

PREDICATES = 
{
  ">=": :gteq,
  "=>": :gteq,
  "<=": :lteq,
  "=<": :lteq,
  "!=": :not_eq,
  ">": :gt,
  "<": :lt
  # in, not_in, present, blank, null, not_null,
  # matches, does not match, cont, cont_any, cont_all,
  # i_cont..., start, end, true, false, not_true, not_false
}

Instance Method Summary collapse

Constructor Details

#initialize(text:, params:, sort: nil) ⇒ RansackTransformer

Returns a new instance of RansackTransformer.



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# File 'lib/search_syntax/ransack_transformer.rb', line 18

def initialize(text:, params:, sort: nil)
  @text = text
  if params.is_a?(Array)
    params = params.to_h { |i| [i.to_s.delete(":"), i] }
  elsif params.is_a?(Hash)
    params = params.map do |k, v|
      k = k.to_s
      skip_predicate = k.include?(":")
      [k.delete(":"), v + (skip_predicate ? ":" : "")]
    end.to_h
  end
  @params = params
  @allowed_params = params.keys
  @sort = sort
  @spell_checker = DidYouMean::SpellChecker.new(dictionary: @allowed_params)
end

Instance Method Details

#transform_sort_param(value) ⇒ Object 



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# File 'lib/search_syntax/ransack_transformer.rb', line 35

def transform_sort_param(value)
  value.split(",").map do |sort_value|
    if sort_value.start_with?("-")
      "#{sort_value[1..]} desc"
    else
      "#{sort_value} asc"
    end
  end
end

#transform_with_errors(ast) ⇒ Object 



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# File 'lib/search_syntax/ransack_transformer.rb', line 45

def transform_with_errors(ast)
  errors = []
  result = {}

  if @allowed_params.length > 0
    ast = ast.filter do |node|
      if node[:type] != :param
        true
      elsif node[:name] == @sort
        result[:s] = transform_sort_param(node[:value])
        false
      elsif @allowed_params.include?(node[:name])
        key = name_with_predicate(node)
        if !result.key?(key)
          result[key] = node[:value]
        else
          errors.push(DuplicateParamError.new(
            name: node[:name],
            start: node[:start],
            finish: node[:finish]
          ))
        end
        false
      else
        errors.push(UnknownParamError.new(
          name: node[:name],
          start: node[:start],
          finish: node[:finish],
          did_you_mean: @spell_checker.correct(node[:name])
        ))
        true
      end
    end
  end

  previous = -1
  result[@text] = ast.map do |node|
    separator = previous == node[:start] || previous == -1 ? "" : " "
    previous = node[:finish]
    separator + node[:raw]
  end.join

  [result, errors]
end