Allow the option labels of NullableBooleanInput to be customized

docs/Inputs.md

@@ -450,30 +450,34 @@ import { NullableBooleanInput } from 'react-admin';
 
 ![NullableBooleanInput](./img/nullable-boolean-input.png)
 
-`<NullableBooleanInput />` doesn't display the empty option by default. If you want to customize its label and display it, you can use the `displayNull` prop.
-
-```jsx
-import { NullableBooleanInput } from 'react-admin';
-
-<NullableBooleanInput 
-    label="Commentable"
-    source="commentable"
-    displayNull
-/>
-```
-
-Also you need to provide your own label for null value.
+The labels of the options can be customized for the entire application by overriding the translation.
 
 ```jsx
 import polyglotI18nProvider from 'ra-i18n-polyglot';
 import englishMessages from 'ra-language-english';
 
 englishMessages.ra.boolean.null = 'Null label';
+englishMessages.ra.boolean.false = 'False label';
+englishMessages.ra.boolean.true = 'True label';
 const i18nProvider = polyglotI18nProvider(() => englishMessages, 'en');
 
 <Admin i18nProvider={i18nProvider}></Admin>
 ```
 
+Additionally, individual instances of `NullableBooleanInput` may be customized by setting the `nullLabel`, `falseLabel` and `trueLabel` properties. Values specified for those properties will be translated by react-admin.
+
+```jsx
+import { NullableBooleanInput } from 'react-admin';
+
+<NullableBooleanInput
+    label="Commentable"
+    source="commentable"
+    nullLabel="Either"
+    falseLabel="No"
+    trueLabel="Yes"
+/>
+```
+
 ![NullableBooleanInput](./img/nullable-boolean-input-null-label.png)
 
 `<BooleanInput>` and `<NullableBooleanInput>` also accept the [common input props](./Inputs.md#common-input-props).

packages/ra-ui-materialui/src/input/NullableBooleanInput.spec.tsx

@@ -138,4 +138,70 @@ describe('<NullableBooleanInput />', () => {
             'true'
         );
     });
+
+    it('should allow to customize the label of the null option', () => {
+        const { getByRole, getByText, container } = render(
+            <Form
+                onSubmit={jest.fn}
+                initialValues={{
+                    isPublished: null,
+                }}
+                render={() => (
+                    <NullableBooleanInput
+                        source="isPublished"
+                        resource="posts"
+                        nullLabel="example null label"
+                    />
+                )}
+            />
+        );
+        expect(container.querySelector('input').getAttribute('value')).toBe('');
+        const select = getByRole('button');
+        fireEvent.mouseDown(select);
+        expect(getByText('example null label')).not.toBeNull();
+    });
+
+    it('should allow to customize the label of the false option', () => {
+        const { getByRole, getByText, container } = render(
+            <Form
+                onSubmit={jest.fn}
+                initialValues={{
+                    isPublished: null,
+                }}
+                render={() => (
+                    <NullableBooleanInput
+                        source="isPublished"
+                        resource="posts"
+                        falseLabel="example false label"
+                    />
+                )}
+            />
+        );
+        expect(container.querySelector('input').getAttribute('value')).toBe('');
+        const select = getByRole('button');
+        fireEvent.mouseDown(select);
+        expect(getByText('example false label')).not.toBeNull();
+    });
+
+    it('should allow to customize the label of the true option', () => {
+        const { getByRole, getByText, container } = render(
+            <Form
+                onSubmit={jest.fn}
+                initialValues={{
+                    isPublished: null,
+                }}
+                render={() => (
+                    <NullableBooleanInput
+                        source="isPublished"
+                        resource="posts"
+                        trueLabel="example true label"
+                    />
+                )}
+            />
+        );
+        expect(container.querySelector('input').getAttribute('value')).toBe('');
+        const select = getByRole('button');
+        fireEvent.mouseDown(select);
+        expect(getByText('example true label')).not.toBeNull();
+    });
 });

packages/ra-ui-materialui/src/input/NullableBooleanInput.tsx

@@ -29,9 +29,14 @@ const getStringFromBoolean = (value?: boolean | null): string => {
     return '';
 };
 
-const NullableBooleanInput: FunctionComponent<
-    InputProps<TextFieldProps> & Omit<TextFieldProps, 'label' | 'helperText'>
-> = props => {
+export type NullableBooleanInputProps = InputProps<TextFieldProps> &
+    Omit<TextFieldProps, 'label' | 'helperText'> & {
+        nullLabel?: string;
+        falseLabel?: string;
+        trueLabel?: string;
+    };
+
+const NullableBooleanInput: FunctionComponent<NullableBooleanInputProps> = props => {
     const {
         className,
         classes: classesOverride,
@@ -43,12 +48,14 @@ const NullableBooleanInput: FunctionComponent<
         onChange,
         onFocus,
         options,
-        displayNull,
         parse = getBooleanFromString,
         resource,
         source,
         validate,
         variant = 'filled',
+        nullLabel = 'ra.boolean.null',
+        falseLabel = 'ra.boolean.false',
+        trueLabel = 'ra.boolean.true',
         ...rest
     } = props;
     const classes = useStyles(props);
@@ -70,20 +77,6 @@ const NullableBooleanInput: FunctionComponent<
         validate,
     });
 
-    const enhancedOptions = displayNull
-        ? {
-              ...options,
-              SelectProps: {
-                  displayEmpty: true,
-                  ...(options && options.SelectProps),
-              },
-              InputLabelProps: {
-                  shrink: true,
-                  ...(options && options.InputLabelProps),
-              },
-          }
-        : options;
-
     return (
         <TextField
             id={id}
@@ -108,12 +101,12 @@ const NullableBooleanInput: FunctionComponent<
             }
             className={classnames(classes.input, className)}
             variant={variant}
-            {...enhancedOptions}
+            {...options}
             {...sanitizeRestProps(rest)}
         >
-            <MenuItem value="">{translate('ra.boolean.null')}</MenuItem>
-            <MenuItem value="false">{translate('ra.boolean.false')}</MenuItem>
-            <MenuItem value="true">{translate('ra.boolean.true')}</MenuItem>
+            <MenuItem value="">{translate(nullLabel)}</MenuItem>
+            <MenuItem value="false">{translate(falseLabel)}</MenuItem>
+            <MenuItem value="true">{translate(trueLabel)}</MenuItem>
         </TextField>
     );
 };
@@ -123,6 +116,9 @@ NullableBooleanInput.propTypes = {
     options: PropTypes.object,
     resource: PropTypes.string,
     source: PropTypes.string,
+    nullLabel: PropTypes.string,
+    falseLabel: PropTypes.string,
+    trueLabel: PropTypes.string,
 };
 
 export default NullableBooleanInput;