Using react-admin , How to create a comment from a post

Question

I am using react-admin for a new project . One of the challenge that I have right is to create something like a comment from a post . Here is the way I try to do it <CreateButton basePath='/prescriptions' label="prescriptions" record={data}/>. The problem That I am facing right is to use the data record in the post form to create the comment , that means I want to send the post_id with the others data from the commentForm . Thanks in advance for helping me.

Answer 1

Well, the post I mentioned in this comment will be published soon. Besides, we're going to support this by default in 2.2.0. In the mean time, here's what you can do:

import { parse } from "query-string";

const CommentCreate = props => {
    // Read the post_id from the location which is injected by React Router and passed to our component by react-admin automatically
    const { post_id: post_id_string } = parse(props.location.search);

    // Optional if you're not using integers as ids
    const post_id = post_id_string ? parseInt(post_id_string, 10) : '';

    return (
        <Create {...props}>
            <SimpleForm
                defaultValue={{ created_at: today, post_id }}
            >
                // ...
            </SimpleForm>
        </Create>
    );
}

Here's the button to create a new comment from an existing post:

import CardActions from '@material-ui/core/CardActions';
import ChatBubbleIcon from "@material-ui/icons/ChatBubble";
import { Button } from 'react-admin';

const AddNewCommentButton = ({ record }) => (
    <Button
        component={Link}
        to={{
            pathname: '/comments/create',
            search: `?post_id=${record.id}`
        }}
        label="Add a comment"
    >
        <ChatBubbleIcon />
    </Button>
);

And finally, how we use it alongside the ReferenceManyField in the post Show component (would work in Edit too):

const PostShow = props => (
    <Show {...props}>
        <TabbedShowLayout>
        ...
            <Tab label="Comments">
                <ReferenceManyField
                    addLabel={false}
                    reference="comments"
                    target="post_id"
                    sort={{ field: "created_at", order: "DESC" }}
                >
                    <Datagrid>
                        <DateField source="created_at" />
                        <TextField source="body" />
                        <EditButton />
                    </Datagrid>
                </ReferenceManyField>
                <AddNewCommentButton />
            </Tab>
        </TabbedShowLayout>
    </Show>
);

You can see this in action in this codesandbox

Edit: post published https://marmelab.com/blog/2018/07/09/react-admin-tutorials-form-for-related-records.html