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Arel::Nodes::Node

Abstract base class for all AST nodes

Public Instance Methods

and(right) click to toggle source

Factory method to create an Nodes::And node.

# File lib/arel/nodes/node.rb, line 22
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 37
def each &block
  return enum_for(:each) unless block_given?

  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 9
def not
  Nodes::Not.new Nodes::Grouping.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 16
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 31
def to_sql engine = Table.engine
  viz = Visitors.for engine
  viz.accept self
end

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