Class: Arel::TreeManager

Inherits:
Object
  • Object
show all
Includes:
FactoryMethods
Defined in:
lib/arel/tree_manager.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from FactoryMethods

#create_and, #create_false, #create_join, #create_on, #create_string_join, #create_table_alias, #create_true, #grouping, #lower

Constructor Details

#initialize(engine) ⇒ TreeManager

Returns a new instance of TreeManager.


7
8
9
10
# File 'lib/arel/tree_manager.rb', line 7

def initialize engine
  @engine = engine
  @ctx    = nil
end

Instance Attribute Details

#astObject (readonly)

Returns the value of attribute ast


5
6
7
# File 'lib/arel/tree_manager.rb', line 5

def ast
  @ast
end

#engineObject (readonly)

Returns the value of attribute engine


5
6
7
# File 'lib/arel/tree_manager.rb', line 5

def engine
  @engine
end

Instance Method Details

#initialize_copy(other) ⇒ Object


24
25
26
27
# File 'lib/arel/tree_manager.rb', line 24

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

#to_dotObject


12
13
14
# File 'lib/arel/tree_manager.rb', line 12

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

#to_sqlObject


20
21
22
# File 'lib/arel/tree_manager.rb', line 20

def to_sql
  visitor.accept @ast
end

#visitorObject


16
17
18
# File 'lib/arel/tree_manager.rb', line 16

def visitor
  engine.connection.visitor
end

#where(expr) ⇒ Object


29
30
31
32
33
34
35
# File 'lib/arel/tree_manager.rb', line 29

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