Creating a Form

1. Create a Client query

1a. Create a fragment to represent your form field keys

import gql from 'graphql-tag';

const fragment = gql`
  fragment client on ClientData {
    name
    age
  }
`;

1b. Create a query for your form state

import gql from 'graphql-tag';

const inputQuery = gql`
  ${fragment}
  {
    sampleForm @client {
      ...client
    }
  }
`;

1b. Create a query to represent your error state

Error queries are namespaced like so: {FORM_NAME}Errors

import gql from 'graphql-tag';

const errorsQuery = gql`
  ${fragment}
  {
    sampleFormErrors @client {
      ...client
    }
  }
`;

2. Creating Initial Props

2a. Create a validator

import { combineValidators, composeValidators } from 'revalidate';

const validator = combineValidators({
  name: composeValidators(isRequired, isAlphabetic)('Name'),
  age: composeValidators(isRequired, isNumeric)('Age'),
});

2b. Supply Initial State

const initialData = {
  name: null,
  age: null,
}

3. Create a Form Provider w/ formName, and initialData

3a. Create your Submit Mutation

const sampleMutation = gql`
  mutation($inputData: PersonInput) {
    createSample(inputData: $inputData)
  }
`;

3b. Create your form

import { createForm, FormSchema, FormProvider } from 'apollo-forms';

const Form = createForm({ mutation: sampleMutation, inputQuery, errorsQuery })(FormProvider);

3c. Pass in initialData and a formName

export default function Root() {
  return (
    <Form
      initialData={initialData}
      formName="sampleForm"
    >
    </Form>
  );
}

4. Create an Input w/ a field prop

import { withInput } from 'apollo-forms';

const Input = withInput('input');

export default function Root() {
  return (
    <Form
      formName="sampleForm"
    >
      <Input
        field="name"
      />
      <Input
        type="number"
        field="age"
      />
    </Form>
  );
}

5. Add a Submit Control

export default function Root() {
  return (
    <Form
      formName="sampleForm"
    >
      <Input
        field="name"
      />
      <Input
        type="number"
        field="age"
      />
      <button type="submit">Submit</button>
    </Form>
  );
}

Hydrating a Form

As long as a FormProvider gets initialData the form will hydrate the appropriate fields in the form. There are some utils provided that may help you hydrate your Form:

1. Create a HydrateProvider

import { createHydrateProvider } from 'apollo-forms';

const query = gql`
  {
    query sample {
      sampleForm {
        name
        age
      }
    }
  }
`;

const HydrateProvider = createHydrateProvider({
  query,
  queryKey: 'sampleForm',
});

2. Use a render prop to pass it into your form:

export default function Root() {
  return (
    <HydrateProvider>
      {(data) => {
        return (
          <Form
            initialData={data}
            formName="sampleForm"
          >
            <Input field="name" />
            <Input type="number" field="age" />
            <SubmitControls />
          </Form>
        );
      }}
    </HydrateProvider>
  );
}

3. Or use withHandlers

import { withHandlers } from 'recompose';

function Root({ renderForm }) {
  return (
    <HydrateProvider>
      {renderForm}
    </HydrateProvider>
  );
}

export default withHandlers({
  renderForm: () => {
    return (data) => {
      return (
        <Form
          initialData={data}
          formName="sampleForm"
        >
          <Input field="name" />
          <Input type="number" field="age" />
          <SubmitControls />
        </Form>
      );
    }
  }
})(Root);

How this works

Under the hood, apollo-forms creates a ApolloClient instance with apollo-linked-state. The form gets its own state graph to work with keyed off formName. When onChange is called from the Input components, both internal react state is updated as well as the local ApolloClient cache.

Validation through the revalidate library is run when the inputs have values and validation messages are passed as props to the base component.

onSubmit, the FormProvider component takes the form state and passes it to the supplied mutation in the form. By default the variables are formatted like this: { inputData: FORM_STATE }. To customize your mutation arguments, pass a transform to the FormProvider to return the form state however you wish.

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