Class: Pluckr::Schema::Node

Inherits:

Object

• Object
• Pluckr::Schema::Node

Defined in:

lib/pluckr/schema/node.rb

Overview

Base class for every AST node.

output is the key the node produces on the result object.

Direct Known Subclasses

Aggregate, Exists, Field, One

Instance Attribute Summary

• #output ⇒ Object readonly

  Returns the value of attribute output.

Instance Method Summary

• #initialize(output:) ⇒ Node constructor

  A new instance of Node.

• #scalar? ⇒ Boolean

  Nodes that map to exactly one selected column/expression.

Constructor Details

#initialize(output:) ⇒ Node

Returns a new instance of Node.

# File 'lib/pluckr/schema/node.rb', line 11

def initialize(output:)
  @output = output.to_sym
end

Instance Attribute Details

#output ⇒ Object (readonly)

Returns the value of attribute output.

# File 'lib/pluckr/schema/node.rb', line 9

def output
  @output
end

Instance Method Details

#scalar? ⇒ Boolean

Nodes that map to exactly one selected column/expression.

Returns:

• (Boolean)

# File 'lib/pluckr/schema/node.rb', line 16

def scalar?
  true
end