FIX Handle a string "0" value

client/src/components/LinkField/LinkField.js

@@ -135,6 +135,14 @@ const LinkField = ({
     })
   );
 
+  // The value for a has_one LinkField will start off as a numeric 0
+  // If a parent object containing a child LinkField without a value is submitted,
+  // using FormSchema, then the FormSchema response may contain a string '0' instead
+  // Ensure that a numeric 0 is used
+  if (value === '0') {
+    value = 0;
+  }
+
   // Ensure we have a valid array
   let linkIDs = value;
   if (!Array.isArray(linkIDs)) {
@@ -498,7 +506,7 @@ const LinkField = ({
 };
 
 LinkField.propTypes = {
-  value: PropTypes.oneOfType([PropTypes.arrayOf(PropTypes.number), PropTypes.number]),
+  value: PropTypes.oneOfType([PropTypes.arrayOf(PropTypes.number), PropTypes.number, PropTypes.string]),
   onChange: PropTypes.func,
   types: PropTypes.object.isRequired,
   actions: PropTypes.object.isRequired,

client/src/components/LinkField/tests/LinkField-test.js

@@ -85,6 +85,15 @@ test('LinkField returns list of links if they exist', async () => {
   expect(container.querySelectorAll('.link-picker__button.font-icon-email')[0]).toHaveTextContent('Email title');
 });
 
+test('LinkField can handle a string "0" value', async () => {
+  const { container } = render(<LinkField {...makeProps({
+    value: '0'
+  })}
+  />);
+  await screen.findByText('Add Link');
+  expect(container.querySelectorAll('.link-picker')).toHaveLength(1);
+});
+
 test('LinkField will render disabled state if disabled is true', async () => {
   const { container } = render(<LinkField {...makeProps({
     ownerID: 1,