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)


266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
 
# File 'lib/familia/features/relationships/indexing/unique_index_generators.rb', line 266

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)



160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
 
# File 'lib/familia/features/relationships/indexing/unique_index_generators.rb', line 160

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


224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
 
# File 'lib/familia/features/relationships/indexing/unique_index_generators.rb', line 224

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|
    field_values = Array(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)



98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
 
# File 'lib/familia/features/relationships/indexing/unique_index_generators.rb', line 98

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|
      field_values = Array(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



54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
 
# File 'lib/familia/features/relationships/indexing/unique_index_generators.rb', line 54

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