class Arel::Nodes::Node

Abstract base class for all AST nodes

Public Class Methods

new() click to toggle source
# File lib/arel/nodes/node.rb, line 16
def initialize
  @caller = caller.dup
end

Public Instance Methods

_caller() click to toggle source
# File lib/arel/nodes/node.rb, line 12
def _caller
  @caller
end
and(right) click to toggle source

Factory method to create an Nodes::And node.

# File lib/arel/nodes/node.rb, line 37
def and right
  Nodes::And.new [self, right]
end
each(&block) click to toggle source

Iterate through AST, nodes will be yielded depth-first

# File lib/arel/nodes/node.rb, line 53
def each &block
  return enum_for(:each) unless block_given?

  ::Arel::Visitors::DepthFirst.new(block).accept self
end
not() click to toggle source

Factory method to create a Nodes::Not node that has the recipient of the caller as a child.

# File lib/arel/nodes/node.rb, line 24
def not
  Nodes::Not.new self
end
or(right) click to toggle source

Factory method to create a Nodes::Grouping node that has an Nodes::Or node as a child.

# File lib/arel/nodes/node.rb, line 31
def or right
  Nodes::Grouping.new Nodes::Or.new(self, right)
end
to_sql(engine = Table.engine) click to toggle source

FIXME: this method should go away. I don't like people calling #to_sql on non-head nodes. This forces us to walk the AST until we can find a node that has a “relation” member.

Maybe we should just use `Table.engine`? :'(

# File lib/arel/nodes/node.rb, line 46
def to_sql engine = Table.engine
  collector = Arel::Collectors::SQLString.new
  collector = engine.connection.visitor.accept self, collector
  collector.value
end