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
  • employee.remove_from_class_email_index
  • employee.update_in_class_email_index(old_email)

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 261

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

      index_hash[field_value.to_s] = identifier
    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, target_class, index_name) ⇒ Object

Generates mutation methods ON THE INDEXED CLASS (Employee): Instance methods for parent-scoped unique index operations:

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

Parameters:

  • indexed_class (Class) —

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

  • field (Symbol) —

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

  • target_class (Class) —

    The parent class (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 156

def generate_mutation_methods_self(indexed_class, field, target_class, index_name)
  target_class_config = target_class.config_name
  indexed_class.class_eval do
    method_name = "add_to_#{target_class_config}_#{index_name}"
    Familia.ld("[UniqueIndexGenerators] #{name} method #{method_name}")

    define_method(method_name) do |target_instance|
      return unless target_instance

      field_value = send(field)
      return unless field_value

      # Use declared field accessor on target instance
      index_hash = target_instance.send(index_name)

      # Use HashKey DataType method
      index_hash[field_value.to_s] = identifier
    end

    method_name = "remove_from_#{target_class_config}_#{index_name}"
    Familia.ld("[UniqueIndexGenerators] #{name} method #{method_name}")

    define_method(method_name) do |target_instance|
      return unless target_instance

      field_value = send(field)
      return unless field_value

      # Use declared field accessor on target instance
      index_hash = target_instance.send(index_name)

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

    method_name = "update_in_#{target_class_config}_#{index_name}"
    Familia.ld("[UniqueIndexGenerators] #{name} method #{method_name}")

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

      new_field_value = send(field)

      # Use Familia's transaction method for atomicity with DataType abstraction
      target_instance.transaction do |_tx|
        # Use declared field accessor on target instance
        index_hash = target_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 220

def generate_query_methods_class(field, index_name, indexed_class)
  indexed_class.define_singleton_method("find_by_#{field}") do |field_value|
    index_hash = send(index_name) # Access the class-level hashkey DataType
    object_id = index_hash[field_value.to_s]

    return nil unless object_id

    new(object_id)
  end

  # Generate class-level bulk query method
  indexed_class.define_singleton_method("find_all_by_#{field}") do |field_values|
    return [] if field_values.empty?

    index_hash = send(index_name) # Access the class-level hashkey DataType
    object_ids = index_hash.values_at(*field_values.map(&:to_s))
    # Filter out nil values and instantiate objects
    object_ids.compact.map { |object_id| new(object_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
    index_hash = send(index_name) # Access the class-level hashkey DataType

    # Clear existing index using DataType method
    index_hash.clear

    # Rebuild from all existing objects
    # This would need to scan through all objects of this class
    # Implementation depends on how objects are stored/tracked
  end
end

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

Generates query methods ON THE PARENT 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)

  • target_class (Class) —

    The parent class (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 95

def generate_query_methods_destination(indexed_class, field, target_class, index_name)
  # Resolve target class using Familia pattern
  actual_target_class = Familia.resolve_class(target_class)

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

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

      # Get the identifier from the hash
      object_id = index_hash[field_value.to_s]
      return nil unless object_id

      indexed_class.new(object_id)
    end

    # Generate bulk query method (e.g., company.find_all_by_badge_number)
    define_method("find_all_by_#{field}") do |field_values|
      return [] if field_values.empty?

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

      # Get all identifiers from the hash
      object_ids = index_hash.values_at(*field_values.map(&:to_s))
      # Filter out nil values and instantiate objects
      object_ids.compact.map { |object_id| indexed_class.new(object_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
      # Use declared field accessor instead of manual instantiation
      index_hash = send(index_name)

      # Clear existing index using DataType method
      index_hash.clear

      # Rebuild from all existing objects
      # This would need to scan through all objects belonging to this parent
      # Implementation depends on how objects are stored/tracked
    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) —

    Parent 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 51

def setup(indexed_class:, field:, index_name:, within:, query:)
  # Normalize parameters and determine scope type
  target_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,
    target_class:      target_class,
    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 && target_class.is_a?(Class)
      generate_query_methods_destination(indexed_class, field, target_class, index_name)
    end
    generate_mutation_methods_self(indexed_class, field, target_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