Class: Arel::TreeManager

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

Defined Under Namespace

Modules: StatementMethods

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from FactoryMethods

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

Constructor Details

#initialize(table = nil) ⇒ TreeManager

Returns a new instance of TreeManager.



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# File 'activerecord/lib/arel/tree_manager.rb', line 47

def initialize(table = nil)
  @table = table
end

Instance Attribute Details

#ast ⇒ Object (readonly)

Returns the value of attribute ast.



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# File 'activerecord/lib/arel/tree_manager.rb', line 45

def ast
  @ast
end

Instance Method Details

#initialize_copy(other) ⇒ Object 



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# File 'activerecord/lib/arel/tree_manager.rb', line 70

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

#to_dot ⇒ Object 



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# File 'activerecord/lib/arel/tree_manager.rb', line 51

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

#to_sql(engine = nil) ⇒ Object 



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# File 'activerecord/lib/arel/tree_manager.rb', line 57

def to_sql(engine = nil)
  unless engine
    table = @table.is_a?(Nodes::JoinSource) ? @table.left : @table

    engine = table&.klass || Table.engine
  end

  collector = Arel::Collectors::SQLString.new
  engine.with_connection do |connection|
    connection.visitor.accept(@ast, collector).value
  end
end