Contents

module DiscoApp::Concerns::CanBeLiquified

  extend ActiveSupport::Concern

  SPLIT_ARRAY_SEPARATOR = '@!@'.freeze
  NIL_VALUE = 'nil'.freeze

  included do
    # Return this model as a hash for use with `to_liquid`. Returns `as_json` by default but is provided here as a hook
    # for potential overrides.
    def as_liquid
      as_json
    end

    # Render this model as a series of concatenated Liquid {%- assign -%} statements.
    def to_liquid
      as_liquid.map { |k, v| "{%- assign #{liquid_model_name}_#{k} = #{as_liquid_value(k, v)} -%}" }.join("\n")
    end

    # Method to allow override of the model name in Liquid. Useful for models
    # residing in namespaces that would otherwise have very long prefixes.
    def liquid_model_name
      model_name.param_key
    end

    private

      # Return given value as a string expression that will be evaluated in Liquid to result in the correct value type.
      def as_liquid_value(key, value)
        html_string = ->(val) { val.is_a?(String) && key.end_with?('_html') }

        case value
        when Numeric, TrueClass, FalseClass
          value.to_s
        when NilClass
          NIL_VALUE
        when Array
          as_liquid_array_value(value)
        when html_string
          as_liquid_html_value(value)
        else
          "'#{CGI.escapeHTML(value.to_s)}'"
        end
      end

      def as_liquid_array_value(value)
        split_array = value.map do |element|
          CGI.escapeHTML(element) if element.is_a? String

          element
        end.join(SPLIT_ARRAY_SEPARATOR)

        "'#{split_array}' | split: '#{SPLIT_ARRAY_SEPARATOR}'"
      end

      def as_liquid_html_value(value)
        "'#{value.to_s.gsub("'", ''')}'"
      end
  end

end

Version data entries

7 entries across 7 versions & 1 rubygems

Version	Path
disco_app-0.17.0	app/models/disco_app/concerns/can_be_liquified.rb
disco_app-0.18.0	app/models/disco_app/concerns/can_be_liquified.rb
disco_app-0.18.2	app/models/disco_app/concerns/can_be_liquified.rb
disco_app-0.18.3	app/models/disco_app/concerns/can_be_liquified.rb
disco_app-0.18.6	app/models/disco_app/concerns/can_be_liquified.rb
disco_app-0.18.4	app/models/disco_app/concerns/can_be_liquified.rb
disco_app-0.18.1	app/models/disco_app/concerns/can_be_liquified.rb