Class: ArelExtensions::Nodes::Concat
- Defined in:
- lib/arel_extensions/nodes/concat.rb
Constant Summary collapse
- RETURN_TYPE =
:string
Class Method Summary collapse
Instance Method Summary collapse
- #concat(other) ⇒ Object
-
#initialize(expr) ⇒ Concat
constructor
A new instance of Concat.
Methods inherited from Function
#!=, #==, #as, #convert_to_date_node, #convert_to_datetime_node, #convert_to_node, #convert_to_number, #convert_to_string_node, #expr, #left, #return_type, #right, #type_of_attribute
Methods included from Predications
#cast, #convert_to_node, #imatches, #in, #matches, #not_in, #when
Constructor Details
#initialize(expr) ⇒ Concat
Returns a new instance of Concat.
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# File 'lib/arel_extensions/nodes/concat.rb', line 5 def initialize expr tab = expr.map { |arg| # flatten nested concats. node = convert_to_node(arg) if node.is_a?(Concat) node.expressions else node end }.flatten.reduce([]) { | res, b | # concatenate successive literal strings. if b.is_a?(Arel::Nodes::Quoted) && b.expr == "" res elsif res.last && res.last.is_a?(Arel::Nodes::Quoted) && b.is_a?(Arel::Nodes::Quoted) res[-1] = Arel::Nodes.build_quoted(res.last.expr + b.expr) else res << b end res } super(tab) end |
Class Method Details
.new(expr) ⇒ Object
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# File 'lib/arel_extensions/nodes/concat.rb', line 28 def self.new expr o = super(expr) if o.expressions.length == 1 o.expressions[0] else o end end |