Redux Form Fields Component and Validation - redux

Question

I am using the redux to hide and show components based on a value.
The Redux form documentation mentions the following:
Connecting to multiple fields should be used sparingly, as it will require the entire component to re-render every time any of the fields it is connected to change. This can be a performance bottleneck. Unless you absolutely need to, you should connect to your fields individually with .
I am unclear if my solution to hiding and showing fields based on radio buttons is good enough to use Fields giving the warning to use sparingly.
Can you please clarify if my component merits enough reason to use Fields. If not, what is an alternative way to implement?
Also, how does fields implement validations?
<div>
<form>
<Fields
component={RadioButtonGroupField}
names={['radioButtonGroup', 'nameTextField', 'nickNameTextField']}
/>
</ form>
</div>
function RadioButtonGroupField(fields) {
return(
<div>
<RadioButtonGroupComponent
{...fields.radioButtonGroup.input}
{...fields.radioButtonGroup.meta}
/>
{
(fields.radioButtonGroup.input.value === 'name' ||
fields.radioButtonGroup.input.value === 'both') &&
<NameTextFieldComponent
{...fields.radioButtonGroup.input}
{...fields.radioButtonGroup.meta}
/>
}
{
(fields.radioButtonGroup.input.value === 'nickname' ||
fields.radioButtonGroup.input.value === 'both') &&
<NicknameTextFieldComponent
{...fields.radioButtonGroup.input}
{...fields.radioButtonGroup.meta}
/>
}
</div>
);
}

Answer 1

There is another way you could do that, selecting the specific value using redux-form selectors (http://redux-form.com/6.0.5/docs/api/Selectors.md/) from the redux store in your mapStateToProps and then conditionally rendering certain components.
However, I think that Fields is exactly what you should use in this circumstance. I think that warning is largely to warn people not to go and put their entire form into Fields, having those 3 fields rerender is no big deal.
The thought process that led to the creation of Fields in the first place is probably the best way to get a handle on this: https://github.com/erikras/redux-form/issues/841