Class: Dbee::Providers::ActiveRecordProvider::Makers::Where

Inherits:
Object
  • Object
show all
Includes:
Singleton
Defined in:
lib/dbee/providers/active_record_provider/makers/where.rb

Overview

Derives Arel#where predicates.

Instance Method Summary collapse

Instance Method Details

#make(filter, arel_column) ⇒ Object 



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# File 'lib/dbee/providers/active_record_provider/makers/where.rb', line 18

def make(filter, arel_column)
  # If the filter has a value of nil, then simply return an IS (NOT) NULL predicate
  return make_is_null_predicate(arel_column, filter.class) if filter.value.nil?

  values = Array(filter.value).flatten

  # This logic helps ensure that if a null exists that it translates to an IS NULL
  # predicate and does not get put into an in or not_in clause.
  predicates =
    if values.include?(nil)
      [make_is_null_predicate(arel_column, filter.class)]
    else
      []
    end

  predicates += make_predicates(filter, arel_column, values - [nil])

  # Chain all predicates together
  predicates.inject(predicates.shift) do |memo, predicate|
    memo.or(predicate)
  end
end