# Body - Fields { #body-fields }

The same way you can declare additional validation and metadata in *path operation function* parameters with `Query`, `Path` and `Body`, you can declare validation and metadata inside of Pydantic models using Pydantic's `Field`.

## Import `Field` { #import-field }

First, you have to import it:

{* ../../docs_src/body_fields/tutorial001_an_py310.py hl[4] *}


/// warning

			tests.AssertObjEqual(t, ai, ei, "Name", "Class", "Type", "Where", "Comment", "Option")

			if len(ei.Fields) != len(ai.Fields) {
				t.Errorf("expected index %q field length is %d but actual %d", ei.Name, len(ei.Fields), len(ai.Fields))
				return
			}
			for i, ef := range ei.Fields {
				af := ai.Fields[i]
				tests.AssertObjEqual(t, af, ef, "Name", "Unique", "UniqueIndex", "Expression", "Sort", "Collate", "Length", "NotNull")

they don't break their (horizontal) containers.\n  resize: vertical;\n}\n\nfieldset {\n  // Browsers set a default `min-width: min-content;` on fieldsets,\n  // unlike e.g. `<div>`s, which have `min-width: 0;` by default.\n  // So we reset that to ensure fieldsets behave more like a standard block element.\n  // See https://github.com/twbs/bootstrap/issues/12359\n  // and https://html.spec.whatwg.org/multipage/#the-fieldset-and-legend-elements\n  min-width: 0;\n  // Reset the default outline behavior...

// 1\n}\n\n// 1. Browsers set a default `min-width: min-content;` on fieldsets,\n//    unlike e.g. `<div>`s, which have `min-width: 0;` by default.\n//    So we reset that to ensure fieldsets behave more like a standard block element.\n//    See https://github.com/twbs/bootstrap/issues/12359\n//    and https://html.spec.whatwg.org/multipage/#the-fieldset-and-legend-elements\n// 2. Reset the default outline behavior of fieldsets so they don't affect page layout.\n\nfieldset {\n  min-width: 0; // 1\n...

Sebastián Ramírez <******@****.***> 1731896744 +0100

]::-moz-focus-inner,[type=reset]::-moz-focus-inner,[type=submit]::-moz-focus-inner,button::-moz-focus-inner{padding:0;border-style:none}input[type=checkbox],input[type=radio]{box-sizing:border-box;padding:0}textarea{overflow:auto;resize:vertical}fieldset{min-width:0;padding:0;margin:0;border:0}legend{display:block;width:100%;max-width:100%;padding:0;margin-bottom:.5rem;font-size:1.5rem;line-height:inherit;color:inherit;white-space:normal}progress{vertical-align:baseline}[type=number]::-webkit-in...

        String[] fields = fieldsStr.isEmpty() ? new String[0] : fieldsStr.split(",");
        assertEquals(0, fields.length);
    }

    public void test_indexAdminFloatFields() {
        String fieldsStr = fessConfig.getIndexAdminFloatFields();
        assertEquals("", fieldsStr);
        String[] fields = fieldsStr.isEmpty() ? new String[0] : fieldsStr.split(",");
        assertEquals(0, fields.length);
    }

Sebastián Ramírez <******@****.***> 1731896744 +0100

Hirokatsu Endo <******@****.***> 1750602893 +0900

Sebastián Ramírez <******@****.***> 1731896744 +0100