Contents

require "hario/behaviours/utils"

class PluckParser
  include ParserUtils

  attr_accessor :join_clause, :pluck_clause

  def initialize(pluck, klass)
    @pluck = pluck
    @klass = klass

    parse_pluck
  end

  private
    def parse_pluck
      @join_clause = {}
      @pluck_clause = [[@klass.table_name, 'id'].join('.')]

      ns, no_ns = @pluck.partition{ |p| p.include?('.') }

      no_ns.each{ |p| @pluck_clause << [@klass.table_name, p].join('.') }

      ns.each do |p|
        association_chain, attribute = parse_namespace(p)

        nested_associations = (association_chain << {}).reverse.inject { |v, key| { key => v } }
        @join_clause.deep_merge!(nested_associations)

        attribute_table = table_name_from_association_chain(association_chain)
        @pluck_clause << [attribute_table, attribute].join('.')
      end
    end

    def parse_namespace(namespace)
      parts = namespace.split('.')
      attribute = parts.pop
      association_chain = parts
      
      [association_chain, attribute]
    end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
hario-0.1.1	lib/hario/behaviours/pluck.rb
hario-0.1.0	lib/hario/behaviours/pluck.rb