Class: Torque::PostgreSQL::PredicateBuilder::LtreeHandler

Inherits:
Object
  • Object
show all
Defined in:
lib/torque/postgresql/predicate_builder/ltree_handler.rb

Overview

A condition over an ltree column is rarely a plain equality, so the value decides which operator to use: a plain path is compared with =, while anything carrying an lquery marker is matched with ~

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(predicate_builder) ⇒ LtreeHandler

Returns a new instance of LtreeHandler.



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# File 'lib/torque/postgresql/predicate_builder/ltree_handler.rb', line 24

def initialize(predicate_builder)
  @predicate_builder = predicate_builder
end

Class Method Details

.candidate?(value, type) ⇒ Boolean

An Array is always a single value here, either the labels of a path or the items of a pattern, so it never means a list of values the way the regular handlers would take it. Objects that describe their own path are claimed as well, otherwise a record would be reduced to its primary key before it had the chance to describe itself

Returns:

  • (Boolean) 


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# File 'lib/torque/postgresql/predicate_builder/ltree_handler.rb', line 16

def candidate?(value, type)
  return false unless type.is_a?(Adapter::OID::Ltree)

  value.is_a?(::Array) || value.is_a?(LQuery) ||
    LTree.compatible?(value) || LQuery.marker?(value)
end

Instance Method Details

#call(attribute, type, value) ⇒ Object 



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# File 'lib/torque/postgresql/predicate_builder/ltree_handler.rb', line 28

def call(attribute, type, value)
  return attribute.eq(FN.bind_with(attribute, type.cast(value))) \
    unless LQuery.marker?(value)

  attribute.matches_lquery(pattern_for(attribute, value))
end