Module: Dynamoid::Indexes::ClassMethods

Defined in:
lib/dynamoid/indexes.rb

Instance Method Summary collapse

Instance Method Details

#create_indexes ⇒ Object 



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# File 'lib/dynamoid/indexes.rb', line 24

def create_indexes
  self.indexes.each do |index|
    self.create_table(index_table_name(index), index_key_name(index)) unless self.table_exists?(index_table_name(index))
  end
end

#index(name, options = {}) ⇒ Object

Raises:



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# File 'lib/dynamoid/indexes.rb', line 17

def index(name, options = {})
  name = Array(name).collect(&:to_s).sort.collect(&:to_sym)
  raise Dynamoid::Errors::InvalidField, 'A key specified for an index is not a field' unless name.all?{|n| self.fields.include?(n)}
  self.indexes << name
  create_indexes
end

#index_key_name(index) ⇒ Object 



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# File 'lib/dynamoid/indexes.rb', line 34

def index_key_name(index)
  "#{self.to_s.downcase}_#{index.collect(&:to_s).collect(&:pluralize).join('_and_')}"
end

#index_table_name(index) ⇒ Object 



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# File 'lib/dynamoid/indexes.rb', line 30

def index_table_name(index)
  "#{Dynamoid::Config.namespace}_index_#{index_key_name(index)}"
end

#key_for_index(index, values = []) ⇒ Object 



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# File 'lib/dynamoid/indexes.rb', line 38

def key_for_index(index, values = [])
  values = values.collect(&:to_s).sort
  Digest::SHA2.new.tap do |sha|
    index.each_with_index {|i, index| sha << values[index] if values[index]}
  end.to_s
end