class Arel::Nodes::Node
Abstract base class for all AST nodes
Public Class Methods
new()
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# File lib/arel/nodes/node.rb, line 14 def initialize @caller = caller.dup end
Public Instance Methods
_caller()
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# File lib/arel/nodes/node.rb, line 10 def _caller @caller end
and(right)
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Factory method to create an Nodes::And node.
# File lib/arel/nodes/node.rb, line 35 def and right Nodes::And.new [self, right] end
each(&block)
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Iterate through AST, nodes will be yielded depth-first
# File lib/arel/nodes/node.rb, line 49 def each &block return enum_for(:each) unless block_given? ::Arel::Visitors::DepthFirst.new(block).accept self end
not()
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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 22 def not Nodes::Not.new self end
or(right)
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Factory method to create a Nodes::Grouping node that has an Nodes::Or node as a child.
# File lib/arel/nodes/node.rb, line 29 def or right Nodes::Grouping.new Nodes::Or.new(self, right) end
to_sql(engine = Table.engine)
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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 44 def to_sql engine = Table.engine engine.connection.visitor.accept self end