Class: ParamsReady::Query::NullnessPredicate

Inherits:
Parameter::AbstractParameter show all
Includes:
Predicate::DelegatingPredicate, Predicate::HavingAttribute
Defined in:
lib/params_ready/query/nullness_predicate.rb

Instance Attribute Summary

Attributes included from Predicate::DelegatingPredicate

#data

Attributes inherited from Parameter::AbstractParameter

#definition

Instance Method Summary collapse

Methods included from Predicate::HavingAttribute

#context_for_predicates, #test, #to_query

Methods included from Predicate::HavingAssociations

#dig

Methods included from Predicate::DelegatingPredicate

#eligible_for_query?, included, #to_query_if_eligible

Methods inherited from Parameter::AbstractParameter

#==, #dup, #inspect, intent_for_children, #match?, #populate, #to_hash, #update_if_applicable, #update_in

Methods included from Extensions::Freezer

#freeze_variable, #freeze_variables, #variables_to_freeze

Methods included from Parameter::FromHash

#set_from_hash

Methods included from Extensions::Freezer::InstanceMethods

#freeze

Constructor Details

#initialize(definition) ⇒ NullnessPredicate

Returns a new instance of NullnessPredicate.



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# File 'lib/params_ready/query/nullness_predicate.rb', line 10

def initialize(definition)
  super definition
  @data = definition.value_parameter.create
end

Instance Method Details

#build_query(select_expression, context: nil) ⇒ Object 



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# File 'lib/params_ready/query/nullness_predicate.rb', line 15

def build_query(select_expression, context: nil)
  query = select_expression.eq(nil)
  if !unwrap
    query.not
  else
    query
  end
end

#inspect_content ⇒ Object 



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# File 'lib/params_ready/query/nullness_predicate.rb', line 34

def inspect_content
  "#{definition.attribute_name} is_null? #{@data.inspect}"
end

#perform_test(record, attribute_name) ⇒ Object 



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# File 'lib/params_ready/query/nullness_predicate.rb', line 24

def perform_test(record, attribute_name)
  if unwrap
    return true if record.nil?
    record.send(attribute_name).nil?
  else
    return false if record.nil?
    !record.send(attribute_name).nil?
  end
end