lib/arel/tree_manager.rb


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36

module Arel
  class TreeManager
    # FIXME: Remove this.
    include Arel::Relation

    attr_accessor :visitor
    attr_reader :ast, :engine

    def initialize engine
      @engine  = engine
      @visitor = Visitors.visitor_for @engine
      @ctx     = nil
    end

    def to_dot
      Visitors::Dot.new.accept @ast
    end

    def to_sql
      @visitor.accept @ast
    end

    def initialize_copy other
      super
      @ast = @ast.clone
    end

    def where expr
      if Arel::TreeManager === expr
        expr = expr.ast
      end
      @ctx.wheres << expr
      self
    end
  end
end