Class: Familia::FieldType

Inherits:
Object
  • Object
show all
Defined in:
lib/familia/field_type.rb

Overview

Base class for all field types in Familia

Field types encapsulate the behavior for different kinds of fields, including how their getter/setter methods are defined and how values are serialized/deserialized.

Examples:

Creating a custom field type

class TimestampFieldType < Familia::FieldType
  def define_setter(klass)
    field_name = @name
    klass.define_method :"#{@method_name}=" do |value|
      timestamp = value.is_a?(Time) ? value.to_i : value
      instance_variable_set(:"@#{field_name}", timestamp)
    end
  end

  def define_getter(klass)
    field_name = @name
    klass.define_method @method_name do
      timestamp = instance_variable_get(:"@#{field_name}")
      timestamp ? Time.at(timestamp) : nil
    end
  end
end

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, as: name, fast_method: :"#{name}!", on_conflict: :raise, loggable: true, **options) ⇒ FieldType

Initialize a new field type

Parameters:

  • name (Symbol) —

    The field name

  • as (Symbol, String, false) (defaults to: name) —

    The method name (defaults to field name) If false, no accessor methods are created

  • fast_method (Symbol, String, false) (defaults to: :"#{name}!") —

    The fast method name (defaults to "##name!"). If false, no fast method is created

  • on_conflict (Symbol) (defaults to: :raise) —

    Conflict resolution strategy when method already exists (:raise, :skip, :warn, :overwrite)

  • loggable (Boolean) (defaults to: true) —

    Whether this field should be included in serialization and logging operations (default: true)

  • options (Hash) —

    Additional options for the field type



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# File 'lib/familia/field_type.rb', line 49

def initialize(name, as: name, fast_method: :"#{name}!", on_conflict: :raise, loggable: true, **options)
  @name = name.to_sym
  @method_name = as == false ? nil : as.to_sym
  @fast_method_name = fast_method == false ? nil : fast_method&.to_sym

  # Validate fast method name format
  if @fast_method_name && !@fast_method_name.to_s.end_with?('!')
    raise ArgumentError, "Fast method name must end with '!' (got: #{@fast_method_name})"
  end

  @on_conflict = on_conflict
  @loggable = loggable
  @options = options
end

Instance Attribute Details

#fast_method_name ⇒ Object (readonly)

Returns the value of attribute fast_method_name.



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# File 'lib/familia/field_type.rb', line 32

def fast_method_name
  @fast_method_name
end

#loggable ⇒ Object (readonly)

Returns the value of attribute loggable.



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# File 'lib/familia/field_type.rb', line 32

def loggable
  @loggable
end

#method_name ⇒ Object (readonly)

Returns the value of attribute method_name.



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# File 'lib/familia/field_type.rb', line 32

def method_name
  @method_name
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/familia/field_type.rb', line 32

def name
  @name
end

#on_conflict ⇒ Object (readonly)

Returns the value of attribute on_conflict.



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# File 'lib/familia/field_type.rb', line 32

def on_conflict
  @on_conflict
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/familia/field_type.rb', line 32

def options
  @options
end

Instance Method Details

#category ⇒ Symbol

The category for this field type (used for filtering)

Returns:

  • (Symbol) —

    the field category



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# File 'lib/familia/field_type.rb', line 219

def category
  :field
end

#define_fast_writer(klass) ⇒ Object

Define the fast writer method on the target class

Fast methods provide direct database access for immediate persistence. Subclasses can override this to customize fast method behavior.

Parameters:

  • klass (Class) —

    The class to define the method on



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# File 'lib/familia/field_type.rb', line 140

def define_fast_writer(klass)
  return unless @fast_method_name&.to_s&.end_with?('!')

  field_name = @name
  method_name = @method_name
  fast_method_name = @fast_method_name

  handle_method_conflict(klass, fast_method_name) do
    klass.define_method fast_method_name do |*args|
      raise ArgumentError, "wrong number of arguments (given #{args.size}, expected 0 or 1)" if args.size > 1

      val = args.first

      # If no value provided, return current stored value
      # Handle Redis::Future objects during transactions
      return hget(field_name) if val.nil? || val.is_a?(Redis::Future)

      # Prevent fast writer within transaction/pipeline - the return value
      # would be Redis::Future which doesn't support zero?/positive? checks
      if Fiber[:familia_transaction]
        Familia.trace :FAST_WRITER_BLOCKED, dbkey,
                     "#{fast_method_name} blocked by active transaction context"
        raise Familia::OperationModeError, <<~ERROR_MESSAGE.chomp
          Cannot call fast writer #{fast_method_name} within a transaction.
          Use multi_field_update or commit_fields instead.
        ERROR_MESSAGE
      elsif Fiber[:familia_pipeline]
        Familia.trace :FAST_WRITER_BLOCKED, dbkey,
                     "#{fast_method_name} blocked by active pipeline context"
        raise Familia::OperationModeError, <<~ERROR_MESSAGE.chomp
          Cannot call fast writer #{fast_method_name} within a pipeline.
          Restructure to call fast writers outside the pipeline.
        ERROR_MESSAGE
      end

      begin
        # Trace the operation if debugging is enabled
        Familia.trace :FAST_WRITER, nil, "#{field_name}: #{val.inspect}" if Familia.debug?

        # Convert value for database storage
        prepared = serialize_value(val)
        Familia.debug "[FieldType#define_fast_writer] #{fast_method_name} val: #{val.class} prepared: #{prepared.class}"

        # Use the setter method to update instance variable
        send(:"#{method_name}=", val) if method_name

        # Persist to database immediately
        ret = hset(field_name, prepared)

        # Touch instances timeline so the object is visible
        # to list-based enumeration (instances.to_a, count, etc.)
        touch_instances! if respond_to?(:touch_instances!)

        clear_dirty!(field_name) if respond_to?(:clear_dirty!)

        ret.zero? || ret.positive?
      rescue Familia::Problem => e
        raise "#{fast_method_name} method failed: #{e.message}", e.backtrace
      end
    end
  end
end

#define_getter(klass) ⇒ Object

Define the getter method on the target class

Subclasses can override this to customize getter behavior. The default implementation creates a simple attr_reader equivalent.

Parameters:

  • klass (Class) —

    The class to define the method on



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# File 'lib/familia/field_type.rb', line 96

def define_getter(klass)
  field_name = @name
  method_name = @method_name

  handle_method_conflict(klass, method_name) do
    klass.define_method method_name do
      instance_variable_get(:"@#{field_name}")
    end
  end
end

#define_setter(klass) ⇒ Object

Note:

This setter only updates the in-memory instance variable. Call +save+, +commit_fields+, or use the fast_writer (+field_name!+) to persist to Redis.

Define the setter method on the target class

Subclasses can override this to customize setter behavior. The default implementation creates a simple attr_writer equivalent.

Parameters:

  • klass (Class) —

    The class to define the method on



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# File 'lib/familia/field_type.rb', line 118

def define_setter(klass)
  field_name = @name
  method_name = @method_name

  handle_method_conflict(klass, :"#{method_name}=") do
    klass.define_method :"#{method_name}=" do |value|
      old_value = instance_variable_get(:"@#{field_name}")
      instance_variable_set(:"@#{field_name}", value)

      # Track the change for dirty-tracking (only for Horreum instances)
      mark_dirty!(field_name, old_value) if respond_to?(:mark_dirty!)
    end
  end
end

#deserialize(value, _record = nil) ⇒ Object

Deserialize a value from database storage

Subclasses can override this to customize deserialization. The default implementation passes values through unchanged.

Parameters:

  • value (Object) —

    The value to deserialize

  • _record (Object) (defaults to: nil) —

    The record instance (for context)

Returns:

  • (Object) —

    The deserialized value



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# File 'lib/familia/field_type.rb', line 245

def deserialize(value, _record = nil)
  value
end

#generated_methods ⇒ Array<Symbol>

Returns all method names generated for this field (used for conflict detection)

Returns:

  • (Array<Symbol>) —

    Array of method names this field type generates



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# File 'lib/familia/field_type.rb', line 253

def generated_methods
  [@method_name, @fast_method_name].compact
end

#inspect ⇒ String Also known as: to_s

Enhanced inspection output for debugging

Returns:

  • (String) —

    Human-readable representation



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# File 'lib/familia/field_type.rb', line 261

def inspect
  attributes = [
    "name=#{@name}",
    "method_name=#{@method_name}",
    "fast_method_name=#{@fast_method_name}",
    "on_conflict=#{@on_conflict}",
    "category=#{category}",
  ]
  "#<#{self.class.name} #{attributes.join(' ')}>"
end

#install(klass) ⇒ Object

Install this field type on a class

This method defines all necessary methods on the target class and registers the field type for later reference.

Parameters:

  • klass (Class) —

    The class to install this field type on



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# File 'lib/familia/field_type.rb', line 71

def install(klass)
  if @method_name
    # For skip strategy, check for any method conflicts first
    if @on_conflict == :skip
      has_getter_conflict = klass.method_defined?(@method_name) || klass.private_method_defined?(@method_name)
      has_setter_conflict = klass.method_defined?(:"#{@method_name}=") || klass.private_method_defined?(:"#{@method_name}=")

      # If either getter or setter conflicts, skip the whole field
      return if has_getter_conflict || has_setter_conflict
    end

    define_getter(klass)
    define_setter(klass)
  end

  define_fast_writer(klass) if @fast_method_name
end

#persistent? ⇒ Boolean

Whether this field should be persisted to the database

Returns:

  • (Boolean) —

    true if field should be persisted



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# File 'lib/familia/field_type.rb', line 207

def persistent?
  true
end

#serialize(value, _record = nil) ⇒ Object

Serialize a value for database storage

Subclasses can override this to customize serialization. The default implementation passes values through unchanged.

Parameters:

  • value (Object) —

    The value to serialize

  • _record (Object) (defaults to: nil) —

    The record instance (for context)

Returns:

  • (Object) —

    The serialized value



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# File 'lib/familia/field_type.rb', line 232

def serialize(value, _record = nil)
  value
end

#transient? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/familia/field_type.rb', line 211

def transient?
  !persistent?
end