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.



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# File 'lib/arel/tree_manager.rb', line 11

def initialize engine
  @engine = engine
  @ctx    = nil
  @bind_values = []
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

#bind_values ⇒ Object

Returns the value of attribute bind_values.



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

def bind_values
  @bind_values
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

Instance Method Details

#initialize_copy(other) ⇒ Object 



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# File 'lib/arel/tree_manager.rb', line 33

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

#to_dot ⇒ Object 



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

def to_dot
  collector = Arel::Collectors::PlainString.new
  collector = Visitors::Dot.new.accept @ast, collector
  collector.value
end

#to_sql ⇒ Object 



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

def to_sql
  collector = Arel::Collectors::SQLString.new
  collector = visitor.accept @ast, collector
  collector.value
end

#visitor ⇒ Object 



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

def visitor
  engine.connection.visitor
end

#where(expr) ⇒ Object 



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# File 'lib/arel/tree_manager.rb', line 38

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