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# Migrate from Pydantic v1 to Pydantic v2 { #migrate-from-pydantic-v1-to-pydantic-v2 }

If you have an old FastAPI app, you might be using Pydantic version 1.

FastAPI version 0.100.0 had support for either Pydantic v1 or v2. It would use whichever you had installed.

FastAPI version 0.119.0 introduced partial support for Pydantic v1 from inside of Pydantic v2 (as `pydantic.v1`), to facilitate the migration to v2.

        .withValueStrengths(ImmutableSet.copyOf(Strength.values()))
        .withConcurrencyLevels(ImmutableSet.of(1, 4, 16, 64))
        .withMaximumSizes(ImmutableSet.of(400, 1000))
        .withInitialCapacities(ImmutableSet.of(0, 1, 10, 100, 1000))
        .withExpireAfterWrites(
            ImmutableSet.of(
                // DurationSpec.of(500, MILLISECONDS),

    for (int exponent : asList(2, 3, 4, 9, 15, 16, 17, 24, 25, 30)) {
      int x = 1 << exponent;
      intValues.add(x, x + 1, x - 1);
    }
    intValues.add(9999).add(10000).add(10001).add(1000000); // near powers of 10
    intValues.add(5792).add(5793); // sqrt(2^25) rounded up and down
    POSITIVE_INTEGER_CANDIDATES = intValues.build();
    NEGATIVE_INTEGER_CANDIDATES =
        ImmutableList.copyOf(

            // When
            fileFsFullSizeInfo.decode(buffer.array(), 0, 32);
            double percentFree = (fileFsFullSizeInfo.getFree() * 100.0) / fileFsFullSizeInfo.getCapacity();
            double percentUsed =
                    ((fileFsFullSizeInfo.getCapacity() - fileFsFullSizeInfo.getFree()) * 100.0) / fileFsFullSizeInfo.getCapacity();

            // Then
            assertEquals(25.0, percentFree, 0.001);

    assertThat(verifier.verify("192.168.1.1", session)).isTrue()
    assertThat(verifier.verify("::ffff:192.168.1.1", session)).isTrue()
    assertThat(verifier.verify("0:0:0:0:0:FFFF:C0A8:0101", session)).isTrue()
  }

  @Test fun generatedCertificate() {
    val heldCertificate =
      HeldCertificate
        .Builder()
        .commonName("Foo Corp")

        assertEquals(0x100, Smb2CreateRequest.FILE_COMPLETE_IF_OPLOCKED);
        assertEquals(0x200, Smb2CreateRequest.FILE_NO_EA_KNOWLEDGE);
        assertEquals(0x400, Smb2CreateRequest.FILE_OPEN_REMOTE_INSTANCE);
        assertEquals(0x800, Smb2CreateRequest.FILE_RANDOM_ACCESS);
        assertEquals(0x1000, Smb2CreateRequest.FILE_DELETE_ON_CLOSE);
        assertEquals(0x2000, Smb2CreateRequest.FILE_OPEN_BY_FILE_ID);

            assertTrue(s1.isEmpty());
            // isBlank will fail if sub_authority is null, so we skip that check for s1

            // All-zero subauthorities
            byte[] ident = new byte[] { 0, 0, 0, 0, 0, 0 };
            rpc.sid_t st = buildSidT((byte) 1, ident, 0, 0);
            SID s2 = new SID(st, jcifs.SID.SID_TYPE_USE_NONE, null, null, false);
            assertFalse(s2.isEmpty());

    void testToStringZeroValues() {
        int fid = 0x0000;
        int securityInfo = 0x00000000;
        querySecurityDesc = new NtTransQuerySecurityDesc(mockConfig, fid, securityInfo);

        String result = querySecurityDesc.toString();

        assertNotNull(result);
        assertTrue(result.contains("fid=0x0000"));
        assertTrue(result.contains("securityInformation=0x00000000"));
    }

    List<Integer> ints = Arrays.asList(0, 1, 2);
    List<Float> floats = Arrays.asList(0.0f, 1.0f, 2.0f);
    List<Long> longs = Arrays.asList(0L, 1L, 2L);
    List<Double> doubles = Arrays.asList(0.0, 1.0, 2.0);

    assertThat(Bytes.toArray(bytes)).isEqualTo(array);
    assertThat(Bytes.toArray(shorts)).isEqualTo(array);
    assertThat(Bytes.toArray(ints)).isEqualTo(array);