Class: Arel::TreeManager

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(engine) ⇒ TreeManager

Returns a new instance of TreeManager.



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

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

Instance Attribute Details

#ast ⇒ Object (readonly)

Returns the value of attribute ast.



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

def ast
  @ast
end

#engine ⇒ Object (readonly)

Returns the value of attribute engine.



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

def engine
  @engine
end

#visitor ⇒ Object

Returns the value of attribute visitor.



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

def visitor
  @visitor
end

Instance Method Details

#initialize_copy(other) ⇒ Object 



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# File 'lib/arel/tree_manager.rb', line 23

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

#to_dot ⇒ Object 



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# File 'lib/arel/tree_manager.rb', line 15

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

#to_sql ⇒ Object 



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# File 'lib/arel/tree_manager.rb', line 19

def to_sql
  @visitor.accept @ast
end

#where(expr) ⇒ Object 



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# File 'lib/arel/tree_manager.rb', line 28

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