Move test-related UUID helper

app/models/concerns/uuid_primary_key.rb

@@ -10,60 +10,6 @@ module UuidPrimaryKey
     uuid_to_base36(SecureRandom.uuid_v7)
   end
 
-  def self.generate_fixture_uuid(label)
-    # Generate deterministic UUIDv7 for fixtures that sorts by fixture ID
-    # This allows .first/.last to work as expected in tests
-    # Use the same CRC32 algorithm as Rails' default fixture ID generation
-    # so that UUIDs sort in the same order as integer IDs
-    fixture_int = Zlib.crc32("fixtures/#{label}") % (2**30 - 1)
-
-    # Use fixture_int as second offset from a fixed base time (1 year before 2025-01-01)
-    # This ensures all fixtures are in the past, and new test records are newest
-    base_time = Time.utc(2024, 1, 1, 0, 0, 0)
-    timestamp = base_time + fixture_int.seconds
-
-    uuid_v7_with_timestamp(timestamp, label)
-  end
-
-  def self.uuid_v7_with_timestamp(time, seed_string)
-    # Generate UUIDv7 with custom timestamp and deterministic random bits
-    # Format: 48-bit timestamp_ms | 12-bit random | 4-bit version | 62-bit random
-
-    timestamp_ms = (time.to_f * 1000).to_i
-
-    # 48-bit timestamp (milliseconds since epoch)
-    bytes = []
-    bytes[0] = (timestamp_ms >> 40) & 0xff
-    bytes[1] = (timestamp_ms >> 32) & 0xff
-    bytes[2] = (timestamp_ms >> 24) & 0xff
-    bytes[3] = (timestamp_ms >> 16) & 0xff
-    bytes[4] = (timestamp_ms >> 8) & 0xff
-    bytes[5] = timestamp_ms & 0xff
-
-    # Derive deterministic "random" bits from seed_string
-    hash = Digest::MD5.hexdigest(seed_string)
-
-    # 12-bit random + 4-bit version (0111 for v7)
-    rand_a = hash[0...3].to_i(16) & 0xfff
-    bytes[6] = ((rand_a >> 8) & 0x0f) | 0x70  # version 7
-    bytes[7] = rand_a & 0xff
-
-    # 2-bit variant (10) + 62-bit random
-    rand_b = hash[3...19].to_i(16) & ((2**62) - 1)
-    bytes[8] = ((rand_b >> 56) & 0x3f) | 0x80  # variant 10
-    bytes[9] = (rand_b >> 48) & 0xff
-    bytes[10] = (rand_b >> 40) & 0xff
-    bytes[11] = (rand_b >> 32) & 0xff
-    bytes[12] = (rand_b >> 24) & 0xff
-    bytes[13] = (rand_b >> 16) & 0xff
-    bytes[14] = (rand_b >> 8) & 0xff
-    bytes[15] = rand_b & 0xff
-
-    # Format as UUID string
-    uuid = "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x" % bytes
-    uuid_to_base36(uuid)
-  end
-
   def self.uuid_to_base36(uuid)
     # Convert standard UUID format to base36 (lowercase), padded to 25 chars
     uuid.delete('-').to_i(16).to_s(36).rjust(25, '0')

test/test_helper.rb

@@ -82,7 +82,63 @@ module FixturesTestHelper
 
       # Rails passes :string for varchar columns, so handle both :uuid and :string
       return super(label, column_type) unless column_type.in?([:uuid, :string])
-      UuidPrimaryKey.generate_fixture_uuid(label)
+      generate_fixture_uuid(label)
+    end
+
+    private
+
+    def generate_fixture_uuid(label)
+      # Generate deterministic UUIDv7 for fixtures that sorts by fixture ID
+      # This allows .first/.last to work as expected in tests
+      # Use the same CRC32 algorithm as Rails' default fixture ID generation
+      # so that UUIDs sort in the same order as integer IDs
+      fixture_int = Zlib.crc32("fixtures/#{label}") % (2**30 - 1)
+
+      # Use fixture_int as second offset from a fixed base time (1 year before 2025-01-01)
+      # This ensures all fixtures are in the past, and new test records are newest
+      base_time = Time.utc(2024, 1, 1, 0, 0, 0)
+      timestamp = base_time + fixture_int.seconds
+
+      uuid_v7_with_timestamp(timestamp, label)
+    end
+
+    def uuid_v7_with_timestamp(time, seed_string)
+      # Generate UUIDv7 with custom timestamp and deterministic random bits
+      # Format: 48-bit timestamp_ms | 12-bit random | 4-bit version | 62-bit random
+
+      timestamp_ms = (time.to_f * 1000).to_i
+
+      # 48-bit timestamp (milliseconds since epoch)
+      bytes = []
+      bytes[0] = (timestamp_ms >> 40) & 0xff
+      bytes[1] = (timestamp_ms >> 32) & 0xff
+      bytes[2] = (timestamp_ms >> 24) & 0xff
+      bytes[3] = (timestamp_ms >> 16) & 0xff
+      bytes[4] = (timestamp_ms >> 8) & 0xff
+      bytes[5] = timestamp_ms & 0xff
+
+      # Derive deterministic "random" bits from seed_string
+      hash = Digest::MD5.hexdigest(seed_string)
+
+      # 12-bit random + 4-bit version (0111 for v7)
+      rand_a = hash[0...3].to_i(16) & 0xfff
+      bytes[6] = ((rand_a >> 8) & 0x0f) | 0x70  # version 7
+      bytes[7] = rand_a & 0xff
+
+      # 2-bit variant (10) + 62-bit random
+      rand_b = hash[3...19].to_i(16) & ((2**62) - 1)
+      bytes[8] = ((rand_b >> 56) & 0x3f) | 0x80  # variant 10
+      bytes[9] = (rand_b >> 48) & 0xff
+      bytes[10] = (rand_b >> 40) & 0xff
+      bytes[11] = (rand_b >> 32) & 0xff
+      bytes[12] = (rand_b >> 24) & 0xff
+      bytes[13] = (rand_b >> 16) & 0xff
+      bytes[14] = (rand_b >> 8) & 0xff
+      bytes[15] = rand_b & 0xff
+
+      # Format as UUID string
+      uuid = "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x" % bytes
+      UuidPrimaryKey.uuid_to_base36(uuid)
     end
   end
 end