Esses validadores personalizados são para coisas que podem ser verificadas **apenas** com os **mesmos dados** fornecidos na requisição.

///

### Entenda esse código { #understand-that-code }

O ponto importante é apenas usar **`AfterValidator` com uma função dentro de `Annotated`**. Sinta-se à vontade para pular esta parte. 🤸

---

// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//

// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//

// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//

// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//

			Columns: []clause.OrderByColumn{{Column: clause.Column{Name: "id", Raw: true}, Desc: true}},
		})
	})
	assertEqualSQL(t, `SELECT * FROM users ORDER BY id DESC`, sql)
}

// assertEqualSQL for assert that the sql is equal, this method will ignore quote, and dialect specials.
func assertEqualSQL(t *testing.T, expected string, actually string) {
	t.Helper()

	// replace SQL quote, convert into postgresql like ""

// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

#include "../../../../../runtime/textflag.h"

TEXT main·foo(SB),DUPOK|NOSPLIT,$16-0 // TEXT main.foo(SB), DUPOK|NOSPLIT, $16-0
	MOVD	R1, R2                // b9040021
	MOVW	R3, R4                // b9140043
	MOVH	R5, R6                // b9070065
	MOVB	R7, R8                // b9060087

// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// This input was created by taking the instruction productions in
// the old assembler's (7a's) grammar and hand-writing complete
// instructions for each rule, to guarantee we cover the same space.

#include "../../../../../runtime/textflag.h"

TEXT	foo(SB), DUPOK|NOSPLIT, $-8

            if (!"pre".equals(element)) {
                return false;
            }
            Element newElement = document.createElement("programlisting");
            //we're making an assumption that all <pre> elements contain java code
            //this should mostly be true :)
            //if it isn't true then the syntax highlighting won't spoil the view too much anyway

// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//