How to reset filter values in react admin framework?

There is a setFilters prop in your filter component, you can use it:

export const PostsFilter = (props) => (
  <div>
    <Filter {...props}>
      <TextInput label='Post ID' source='id' alwaysOn />
      <TextInput label='User ID' source='user_id' alwaysOn />
    </Filter>
    <Button onClick={() => props.setFilters({
          id: '',
          user_id: ''
     })}>Clear fields</Button>
  <div>
);

Unfortunately, setFilters does nothing for me. Here is the solution to the problem:

<FormDataConsumer form={'filterForm'} alwaysOn source='stateId'>
      {({ formData, dispatch, ...rest }) => (
        <ReferenceInput
          resource={props.resource}
          source='stateId'
          reference='states'
          onChange={value => {
            dispatch(change('filterForm', 'districtId', null));
          }}
          allowEmpty>
          <SelectInput optionText='name' />
        </ReferenceInput>
      )}
    </FormDataConsumer>

    {(props.filterValues.stateId || props.filterValues.districtId) && (
      <ReferenceInput
        key={props.filterValues.stateId}
        source='districtId'
        reference='districts'
        filter={{ stateId: props.filterValues.stateId }}
        alwaysOn>
        <SelectInput optionText='name' />
      </ReferenceInput>
    )}

Here's how I created a "Clear Filters" button ("react-admin": "3.10.2").

Extending upon the custom ListActions toolbar example...

import { FilterList } from "@material-ui/icons";
import React from "react";
import {
    Button,
    sanitizeListRestProps,
    TopToolbar
} from "react-admin";

const ListActionsTopToolbar = (props) => {
  const {
    className,
    exporter,
    filters,
    maxResults,
    setFilters,
    ...rest
  } = props;
  return (
    <TopToolbar className={className} {...sanitizeListRestProps(rest)}>
        
        {/* Clear Filters Button */}
      <Button onClick={() => setFilters({})} label="Clear Filters">
        <FilterList />
      </Button>

    </TopToolbar>
  );
};

Traceback: https://github.com/marmelab/react-admin/issues/816#issuecomment-734030723

It sounds like you want to clear the value in the TextInput, which doesn't need redux looking at what you've given us.

One of the approaches to use is saving the filter input to state through the onChange() function - which is maybe where you are also calling the action to hit the backend or change state for the posts that are in your props.

To reset, you can have another button that has in onClick() call to a handleReset(inputId) which you can call setState({filterUser: 'testUser123'}) on that will do what you are asking.

Though it depends how you are wanting to handle it all, there isn't enough information to see how you're doing that, so i'm just speculating on a common way people go about things.