Contents

# frozen_string_literal: true

require 'csv'
require 'active_support/core_ext/hash/indifferent_access'
require 'active_support/core_ext/string/inflections'

require_relative '../adapter_base'
require_relative '../processor_base'

class ActiveSet
  class Processor::Transform < Processor::Base
    class CSVAdapter < Adapter::Base
      def process
        ::CSV.generate do |output|
          output << column_keys_for(item: @set.first)
          @set.each do |item|
            output << column_values_for(item: item)
          end
        end
      end

      private

      def column_keys_for(item:)
        columns.map do |column|
          ColumnInstruction.new(column, item).key
        end
      end

      def column_values_for(item:)
        columns.map do |column|
          ColumnInstruction.new(column, item).value
        end
      end

      def columns
        @instructions.compact
      end

      class ColumnInstruction
        def initialize(hash, item)
          @hash = hash.with_indifferent_access
          @item = item
        end

        def key
          return @hash[:key] if @hash.key? :key
          return attribute_model.human_attribute_name(instructions_entry.attribute) if attribute_model.respond_to? :human_attribute_name
          instruction_entry.keypath.map(&:titleize).join(' ')
        end

        def value
          return blank unless @hash.key?(:value)
          return @hash[:value].call(@item) if @hash[:value]&.respond_to? :call
          instruction_entry.value_for(item: @item)
        end

        private

        def instruction_entry
          Instruction.new(@hash[:value], nil)
        end

        def attribute_model
          instruction_entry.associations_array
                           .reduce(@item) do |obj, assoc|
                             obj&.send(assoc)
                           end.class
        end

        def blank
          '—'
        end
      end
    end
  end
end

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
activeset-0.6.2	lib/active_set/processor_transform/csv_adapter.rb
activeset-0.6.1	lib/active_set/processor_transform/csv_adapter.rb
activeset-0.6.0	lib/active_set/processor_transform/csv_adapter.rb