Class: Arel::TreeManager

Inherits:

Object

• Object
• Arel::TreeManager

show all

Includes:

FactoryMethods

Defined in:

lib/arel/tree_manager.rb

Instance Attribute Summary (collapse)

• - (Object) ast readonly

  Returns the value of attribute ast.

• - (Object) engine readonly

  Returns the value of attribute engine.

Instance Method Summary (collapse)

• - (TreeManager) initialize(engine) constructor

  A new instance of TreeManager.

• - (Object) initialize_copy(other)
• - (Object) to_dot
• - (Object) to_sql
• - (Object) visitor
• - (Object) where(expr)

Methods included from FactoryMethods

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

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

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

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

def ast
  @ast
end

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

def engine
  @engine
end

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

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

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

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

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

def to_sql
  visitor.accept @ast
end

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

def visitor
  engine.connection.visitor
end

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# File 'lib/arel/tree_manager.rb', line 29

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