Module: Familia::Features::Relationships::Indexing::UniqueIndexGenerators

Defined in:
lib/familia/features/relationships/indexing/unique_index_generators.rb

Overview

Generators for unique index (1:1) methods

Unique indexes use HashKey DataType for field-to-object identifier mapping. Each field value maps to exactly one object identifier.

Example (instance-scoped): unique_index :badge_number, :badge_index, within: Company

Generates on Company (destination):

  • company.find_by_badge_number(badge)
  • company.find_all_by_badge_number([badges])
  • company.badge_index
  • company.rebuild_badge_index

Generates on Employee (self):

  • employee.add_to_company_badge_index(company)
  • employee.remove_from_company_badge_index(company)
  • employee.update_in_company_badge_index(company, old_badge)

Example (class-level): unique_index :email, :email_index

Generates on Employee (class):

  • Employee.find_by_email(email)
  • Employee.find_all_by_email([emails])
  • Employee.email_index
  • Employee.rebuild_email_index

Generates on Employee (self):

  • employee.add_to_class_email_index (called automatically on save)
  • employee.remove_from_class_email_index
  • employee.update_in_class_email_index(old_email)

Note: Class-level indexes auto-populate on save(). Instance-scoped indexes (with within:) remain manual as they require parent context.

Class Method Summary collapse

Class Method Details

.generate_mutation_methods_class(field, index_name, indexed_class) ⇒ Object

Generates mutation methods ON THE INDEXED CLASS (Employee): Instance methods for class-level index operations:

  • employee.add_to_class_email_index
  • employee.remove_from_class_email_index
  • employee.update_in_class_email_index(old_email)


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# File 'lib/familia/features/relationships/indexing/unique_index_generators.rb', line 409

def generate_mutation_methods_class(field, index_name, indexed_class)
  indexed_class.class_eval do
    define_method(:"add_to_class_#{index_name}") do
      index_hash = self.class.send(index_name)  # Access the class-level hashkey DataType
      field_value = send(field)

      return unless field_value

      # Just set the value - uniqueness should be validated before save
      index_hash[field_value.to_s] = identifier
    end

    # Add a guard method to enforce unique constraint on this specific index
    #
    # @raise [Familia::RecordExistsError] if a record with the same
    # field value exists. Values are compared as strings.
    #
    # @return [void]
    define_method(:"guard_unique_#{index_name}!") do
      field_value = send(field)
      return unless field_value

      index_hash = self.class.send(index_name)
      existing_id = index_hash.get(field_value.to_s)

      if existing_id && existing_id != identifier
        raise Familia::RecordExistsError, "#{self.class} exists #{field}=#{field_value}"
      end
    end

    define_method(:"remove_from_class_#{index_name}") do
      index_hash = self.class.send(index_name)  # Access the class-level hashkey DataType
      field_value = send(field)

      return unless field_value

      index_hash.remove(field_value.to_s)
    end

    define_method(:"update_in_class_#{index_name}") do |old_field_value = nil|
      new_field_value = send(field)

      # Use class-level transaction for atomicity with DataType abstraction
      self.class.transaction do |_tx|
        index_hash = self.class.send(index_name) # Access the class-level hashkey DataType

        # Remove old value if provided
        index_hash.remove(old_field_value.to_s) if old_field_value

        # Add new value if present
        index_hash[new_field_value.to_s] = identifier if new_field_value
      end
    end
  end
end

.generate_mutation_methods_self(indexed_class, field, scope_class, index_name) ⇒ Object

Generates mutation methods ON THE INDEXED CLASS (Employee)

Instance methods for scope-scoped unique index operations:

  • employee.add_to_company_badge_index(company) - automatically validates uniqueness
  • employee.remove_from_company_badge_index(company)
  • employee.update_in_company_badge_index(company, old_badge)
  • employee.guard_unique_company_badge_index!(company) - manual validation

Parameters:

  • indexed_class (Class) —

    The class being indexed (e.g., Employee)

  • field (Symbol) —

    The field to index (e.g., :badge_number)

  • scope_class (Class) —

    The scope class providing uniqueness context (e.g., Company)

  • index_name (Symbol) —

    Name of the index (e.g., :badge_index)



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# File 'lib/familia/features/relationships/indexing/unique_index_generators.rb', line 235

def generate_mutation_methods_self(indexed_class, field, scope_class, index_name)
  scope_class_config = scope_class.config_name
  indexed_class.class_eval do
    method_name = :"add_to_#{scope_class_config}_#{index_name}"
    Familia.debug("[UniqueIndexGenerators] #{name} method #{method_name}")

    define_method(method_name) do |scope_instance|
      return unless scope_instance

      field_value = send(field)
      return unless field_value

      # Automatically validate uniqueness before adding to index.
      # Skip validation inside transactions since guard methods require read
      # operations not available in MULTI/EXEC blocks.
      unless Fiber[:familia_transaction]
        guard_method = :"guard_unique_#{scope_class_config}_#{index_name}!"
        send(guard_method, scope_instance) if respond_to?(guard_method)
      end

      # Use declared field accessor on scope instance
      index_hash = scope_instance.send(index_name)

      # Set the value (guard already validated uniqueness)
      index_hash[field_value.to_s] = identifier
    end

    # Add a guard method to enforce unique constraint on this instance-scoped index
    #
    # @param scope_instance [Object] The scope instance providing uniqueness context (e.g., a Company)
    # @raise [Familia::RecordExistsError] if a record with the same field value
    #   exists in the scope's index. Values are compared as strings.
    # @return [void]
    #
    # @example
    #   employee.guard_unique_company_badge_index!(company)
    #
    method_name = :"guard_unique_#{scope_class_config}_#{index_name}!"
    Familia.debug("[UniqueIndexGenerators] #{name} method #{method_name}")

    define_method(method_name) do |scope_instance|
      return unless scope_instance

      field_value = send(field)
      return unless field_value

      # Use declared field accessor on scope instance
      index_hash = scope_instance.send(index_name)
      existing_id = index_hash.get(field_value.to_s)

      if existing_id && existing_id != identifier
        raise Familia::RecordExistsError,
          "#{self.class} exists in #{scope_instance.class} with #{field}=#{field_value}"
      end
    end

    method_name = :"remove_from_#{scope_class_config}_#{index_name}"
    Familia.debug("[UniqueIndexGenerators] #{name} method #{method_name}")

    define_method(method_name) do |scope_instance|
      return unless scope_instance

      field_value = send(field)
      return unless field_value

      # Use declared field accessor on scope instance
      index_hash = scope_instance.send(index_name)

      # Remove using HashKey DataType method
      index_hash.remove(field_value.to_s)
    end

    method_name = :"update_in_#{scope_class_config}_#{index_name}"
    Familia.debug("[UniqueIndexGenerators] #{name} method #{method_name}")

    define_method(method_name) do |scope_instance, old_field_value = nil|
      return unless scope_instance

      new_field_value = send(field)

      # Use Familia's transaction method for atomicity with DataType abstraction
      scope_instance.transaction do |_tx|
        # Use declared field accessor on scope instance
        index_hash = scope_instance.send(index_name)

        # Remove old value if provided
        index_hash.remove(old_field_value.to_s) if old_field_value

        # Add new value if present
        index_hash[new_field_value.to_s] = identifier if new_field_value
      end
    end
  end
end

.generate_query_methods_class(field, index_name, indexed_class) ⇒ Object

Generates query methods ON THE INDEXED CLASS (Employee): Class-level methods (singleton):

  • Employee.find_by_email(email)
  • Employee.find_all_by_email([emails])
  • Employee.email_index
  • Employee.rebuild_email_index


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# File 'lib/familia/features/relationships/indexing/unique_index_generators.rb', line 336

def generate_query_methods_class(field, index_name, indexed_class)
  # Generate class-level single record method
  indexed_class.define_singleton_method(:"find_by_#{field}") do |provided_id|
    index_hash = send(index_name) # access the class-level hashkey DataType

    # Get the identifier from the db hashkey using .get method.
    #
    # We use .get instead of [] because it's part of the standard interface
    # common across all DataType classes (List, UnsortedSet, SortedSet, HashKey).
    # While unique indexes always use HashKey, using .get maintains consistency
    # with the broader DataType API patterns used throughout Familia.
    record_id = index_hash.get(provided_id)

    return nil unless record_id

    indexed_class.find_by_identifier(record_id)
  end

  # Generate class-level bulk query method
  indexed_class.define_singleton_method(:"find_all_by_#{field}") do |provided_ids|
    # Convert to array and filter nil inputs before querying Redis.
    # This prevents wasteful lookups for empty string keys (nil.to_s → "").
    # Output may contain fewer elements than input (standard ORM behavior).
    provided_ids = Array(provided_ids).compact
    return [] if provided_ids.empty?

    index_hash = send(index_name) # access the class-level hashkey DataType

    # Get multiple identifiers from the db hashkey using .values_at
    record_ids = index_hash.values_at(*provided_ids.map(&:to_s))

    # Filter out nil values (non-existent records) and instantiate objects
    record_ids.compact.map { |record_id|
      indexed_class.find_by_identifier(record_id)
    }
  end

  # The index accessor method is already created by the class_hashkey declaration
  # No need to manually create it - Horreum handles this automatically

  # Generate method to rebuild the class-level index
  indexed_class.define_singleton_method(:"rebuild_#{index_name}") do |batch_size: 100, &progress_block|
    if respond_to?(:instances)
      # Strategy 1: Use instances collection (fastest)
      index_hashkey = send(index_name)  # Get the index HashKey for serialization
      Familia::Features::Relationships::Indexing::RebuildStrategies.rebuild_via_instances(
        self,                                 # indexed_class (e.g., User)
        field,                                # e.g., :email
        :"add_to_class_#{index_name}",       # e.g., :add_to_class_email_lookup
        index_hashkey,                        # Pass index for serialization
        batch_size: batch_size,
        &progress_block
      )
    else
      # Strategy 3: Fall back to SCAN
      index_hashkey = send(index_name)  # Get the index HashKey for serialization
      Familia::Features::Relationships::Indexing::RebuildStrategies.rebuild_via_scan(
        self,
        field,
        :"add_to_class_#{index_name}",
        index_hashkey,                        # Pass index for serialization
        batch_size: batch_size,
        &progress_block
      )
    end
  end
end

.generate_query_methods_destination(indexed_class, field, scope_class, index_name) ⇒ Object

Generates query methods ON THE SCOPE CLASS (Company when within: Company)

  • company.find_by_badge_number(badge) - find by field value
  • company.find_all_by_badge_number([badges]) - batch lookup
  • company.badge_index - DataType accessor
  • company.rebuild_badge_index - rebuild index

Parameters:

  • indexed_class (Class) —

    The class being indexed (e.g., Employee)

  • field (Symbol) —

    The field to index (e.g., :badge_number)

  • scope_class (Class) —

    The scope class providing uniqueness context (e.g., Company)

  • index_name (Symbol) —

    Name of the index (e.g., :badge_index)



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# File 'lib/familia/features/relationships/indexing/unique_index_generators.rb', line 104

def generate_query_methods_destination(indexed_class, field, scope_class, index_name)
  # Resolve scope class using Familia pattern
  actual_scope_class = Familia.resolve_class(scope_class)

  # Ensure the index field is declared (creates accessor that returns DataType)
  actual_scope_class.send(:ensure_index_field, actual_scope_class, index_name, :hashkey)

  # Get scope_class_config for method naming (needed for rebuild methods)
  scope_class_config = actual_scope_class.config_name

  # Generate instance query method (e.g., company.find_by_badge_number)
  actual_scope_class.class_eval do
    define_method(:"find_by_#{field}") do |provided_value|
      # Use declared field accessor instead of manual instantiation
      index_hash = send(index_name)

      # Get the identifier from the hash using .get method.
      # We use .get instead of [] because it's part of the standard interface
      # common across all DataType classes (List, UnsortedSet, SortedSet, HashKey).
      # While unique indexes always use HashKey, using .get maintains consistency
      # with the broader DataType API patterns used throughout Familia.
      record_id = index_hash.get(provided_value)
      return nil unless record_id

      indexed_class.find_by_identifier(record_id)
    end

    # Generate bulk query method (e.g., company.find_all_by_badge_number)
    define_method(:"find_all_by_#{field}") do |provided_ids|
      # Convert to array and filter nil inputs before querying Redis.
      # This prevents wasteful lookups for empty string keys (nil.to_s → "").
      # Output may contain fewer elements than input (standard ORM behavior).
      provided_ids = Array(provided_ids).compact
      return [] if provided_ids.empty?

      # Use declared field accessor instead of manual instantiation
      index_hash = send(index_name)

      # Get all identifiers from the hash
      record_ids = index_hash.values_at(*provided_ids.map(&:to_s))

      # Filter out nil values (non-existent records) and instantiate objects
      record_ids.compact.map { |record_id|
        indexed_class.find_by_identifier(record_id)
      }
    end

    # Accessor method already created by ensure_index_field above
    # No need to manually define it here

    # Generate method to rebuild the unique index for this parent instance
    define_method(:"rebuild_#{index_name}") do |batch_size: 100, &progress_block|
      # Find the collection containing the indexed class.
      #
      # Strategy 1: Check if indexed_class has a participation relationship
      # pointing back to this scope class. Participation relationships are
      # stored on the PARTICIPANT class (indexed_class), not the target.
      #
      # Example: When RebuildTestEmployee.participates_in(RebuildTestCompany, :employees),
      # the relationship is stored on RebuildTestEmployee, and we need to find it
      # by matching target_class (RebuildTestCompany) with self.class.
      collection = nil
      if indexed_class.respond_to?(:participation_relationships)
        participation = indexed_class.participation_relationships.find do |rel|
          rel.target_class == self.class
        end

        if participation
          collection = send(participation.collection_name)
        end
      end

      # Strategy 2: Fallback to checking related_fields for explicit class: option
      unless collection
        if self.class.respond_to?(:related_fields)
          self.class.related_fields&.each do |name, field_def|
            # Check if this DataType's class option matches the indexed class
            if field_def.opts[:class] == indexed_class
              collection = send(name)
              break
            end
          end
        end
      end

      if collection
        # Find the IndexingRelationship to get cardinality metadata
        index_config = indexed_class.indexing_relationships.find { |rel| rel.index_name == index_name }

        # Strategy 2: Use participation-based rebuild
        index_hashkey = send(index_name)  # Get the index HashKey for serialization
        Familia::Features::Relationships::Indexing::RebuildStrategies.rebuild_via_participation(
          self,                                      # scope_instance (e.g., company)
          indexed_class,                             # e.g., Employee
          field,                                     # e.g., :badge_number
          :"add_to_#{scope_class_config}_#{index_name}",  # e.g., :add_to_company_badge_index
          collection,
          index_config.cardinality,                  # :unique or :multi
          index_hashkey,                             # Pass index for serialization
          batch_size: batch_size,
          &progress_block
        )
      else
        # Strategy 3: Fall back to SCAN with filtering
        index_hashkey = send(index_name)  # Get the index HashKey for serialization
        Familia::Features::Relationships::Indexing::RebuildStrategies.rebuild_via_scan(
          indexed_class,
          field,
          :"add_to_#{scope_class_config}_#{index_name}",
          index_hashkey,                             # Pass index for serialization
          scope_instance: self,
          batch_size: batch_size,
          &progress_block
        )
      end
    end
  end
end

.setup(indexed_class:, field:, index_name:, within:, query:) ⇒ Object

Main setup method that orchestrates unique index creation

Parameters:

  • indexed_class (Class) —

    The class being indexed (e.g., Employee)

  • field (Symbol) —

    The field to index

  • index_name (Symbol) —

    Name of the index

  • within (Class, Symbol, nil) —

    Scope class for instance-scoped index

  • query (Boolean) —

    Whether to generate query methods



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# File 'lib/familia/features/relationships/indexing/unique_index_generators.rb', line 58

def setup(indexed_class:, field:, index_name:, within:, query:)
  # Normalize parameters and determine scope type
  scope_class, scope_type = if within
    k = Familia.resolve_class(within)
    [k, :instance]
  else
    [indexed_class, :class]
  end

  # Store metadata for this indexing relationship
  indexed_class.indexing_relationships << IndexingRelationship.new(
    field:             field,
    scope_class:       scope_class,
    within:            within,
    index_name:        index_name,
    query:             query,
    cardinality:       :unique,
  )

  # Generate appropriate methods based on scope type
  case scope_type
  when :instance
    # Instance-scoped index (within: Company)
    if query && scope_class.is_a?(Class)
      generate_query_methods_destination(indexed_class, field, scope_class, index_name)
    end
    generate_mutation_methods_self(indexed_class, field, scope_class, index_name)
  when :class
    # Class-level index (no within:)
    indexed_class.send(:ensure_index_field, indexed_class, index_name, :class_hashkey)
    generate_query_methods_class(field, index_name, indexed_class) if query
    generate_mutation_methods_class(field, index_name, indexed_class)
  end
end