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Getting Started: Migrating

Migrating from Apollo Client 2? See the previous migration guide

From @apollo-elements/components 1.x

Version 2 Removes variables and trigger named slots from <apollo-mutation>, replacing them with a single anonymous slot. This gives users more control over their mutation components.

The previous named-slot-based API assumed that the user wanted the trigger to appear in the DOM after the variable-inputs, but this isn't always what the user wants. Users also had to make their inputs and triggers direct children of the mutation element - it would not work if they nested them in <label> or <header> elements, for example.

Instead of using slot="variable" add a data-variable attribute to any input-like element that represents a variable, e.g. <input data-variable="varName"\> would represent the value of the varName variable.

Similarly, to assign a button-like element as the trigger, add a trigger attribute to it.

Version 2 also removes the protected trigger and button accessors, and replaces them with triggers and buttons, which return NodeLists.

<apollo-mutation input-key="input">
  <!-- Oops! appears after `a-input` in shadow DOM -->
  <button slot="trigger">Mutate!</button>

  <label>
   <span>Name:</span>
   <!-- Oops! Not slotted into `<apollo-mutation>`! -->
   <input slot="variable" data-variable="name"/>
  </label>
</apollo-mutation>

<apollo-mutation input-key="input">
  <button trigger>Mutate!</button>

  <label>
   <span>A:</span>
   <input data-variable="name"/>
  </label>
</apollo-mutation>

From @apollo-elements/fast 1.x

If you used inline GraphQL script children or JSON script variables, import and apply GraphQLScriptChildMixin

import { ApolloQuery } from '@apollo-elements/fast';
export class QueryElement extends ApolloQuery {/*...*/}

import { ApolloQuery } from '@apollo-elements/fast';
import { GraphQLScriptChildMixin } from '@apollo-elements/mixins';
export class QueryElement extends GraphQLScriptChildMixin(ApolloQuery) {/*...*/}

From @apollo-elements/haunted 1.x

Previous versions mixed the ApolloElement interface into the host element. This was a bad hack, if you relied on it (e.g. by referencing this.data, etc.), change your references to the hook controller instead.

function QueryComponent() {
  const { data } = useQuery(SomeQuery);
  useEffect(() => {
    this.dispatchEvent(new CustomEvent('data'))
  }, [data]);
}

customElements.define('query-component', component(QueryComponent));

document.querySelector('query-component')
  .addEventListener('data', event => {
    // referencing `data` on the element - Bad!
    const { data } = event.target;
  });

function UsesQueryComponent() {
  const { data } = useQuery(SomeQuery);

  useEffect(() => {
    this.dispatchEvent(new CustomEvent('data', { detail: { data } }))
  }, [data]);
}

customElements.define('uses-query-component', component(UsesQueryComponent));

document.querySelector('uses-query-component')
  .addEventListener('data', event => {
    // referencing `data` from the hook's controller - Better!
    const { data } = event.detail;
  });

From @apollo-elements/hybrids 3.x

Previous versions required the use of the client factory to mix the ApolloElement interface into the host element. Render functions and other references to the host would access the query data on host.data, etc.

Version 4 removes the client factory and keeps the GraphQL data within the factory's controller. Change your references from the host to the factory's property:

define('query-component', {
  client: client(),
  query: query(SomeQuery),
  render: host => html`
    <output>${host.data}</output>
  `,
});

define('has-a-query-component', {
  query: query(SomeQuery),
  render: host => html`
    <output>${host.query.data}</output>
  `,
});

Version 4 also removes the pre-made hybrids spread objects altogether. Use the factories instead.

define('query-component', {
  ...ApolloQuery,
  render: host => html`
    <output>${host.data}</output>
  `,
});

document.querySelector('query-component').query = SomeQuery;

define('has-a-query-component', {
  query: query(null),
  render: host => html`
    <output>${host.query.data}</output>
  `,
});

document.querySelector('query-component').query.query = SomeQuery;

From @apollo-elements/lit-apollo 3.x

If you used inline GraphQL script children or JSON script variables, import and apply GraphQLScriptChildMixin

import { ApolloQuery } from '@apollo-elements/lit-apollo';
export class QueryElement extends ApolloQuery {/*...*/}

import { GraphQLScriptChildMixin } from '@apollo-elements/mixins';
import { ApolloQuery } from '@apollo-elements/lit-apollo';
export class QueryElement extends GraphQLScriptChildMixin(ApolloQuery) {/*...*/}

More broadly, Lit users should now prefer to use controllers from core over the lit-apollo package.

import { ApolloQuery } from '@apollo-elements/lit-apollo';
export class QueryElement extends ApolloQuery {
  query = SomeQuery;
  render() {
    const { data, error, loading } = this;
    return html` ... `;
  }
}

import { ApolloQueryController } from '@apollo-elements/core';
export class QueryElement extends LitElement {
  query = new ApolloQueryController(this, SomeQuery);

  render() {
    const { data, error, loading } = this.query;
    return html` ... `;
  }
}

From @apollo-elements/mixins 3.x

If you used inline GraphQL script children or JSON script variables, import and apply GraphQLScriptChildMixin

import { ApolloQueryMixin } from '@apollo-elements/mixins';
export class QueryElement extends ApolloQueryMixin(HTMLElement) {/*...*/}

import { ApolloQueryMixin, GraphQLScriptChildMixin } from '@apollo-elements/mixins';
export class QueryElement extends GraphQLScriptChildMixin(ApolloQueryMixin(HTMLElement)) {/*...*/}

More broadly, mixins users can use controller-based workflows by applying the ControllerHostMixin:

import { ApolloQueryMixin } from '@apollo-elements/mixins';
import { SomeQuery } from './Some.query.graphql';
export class QueryElement extends ApolloQueryMixin(HTMLElement)<typeof SomeQuery> {
  myRenderCallback() {
    // get the query data on the element
    const { data } = this;
    // ...somehow render the query data
  }
}

import { ControllerHostMixin } from '@apollo-elements/mixins';
import { SomeQuery } from './Some.query.graphql';

export class ElementWithAQuery extends ControllerHostMixin(HTMLElement) {
  query = new ApolloQueryController(this, SomeQuery);

  update() {
    this.myRenderCallback()
    // Don't forget the super call
    super.update();
  }

  myRenderCallback() {
    // get the query data from the Controller
    const { data } = this.query;
    // ...somehow render the query data
  }
}

From @apollo-elements/polymer 3.x

The element names and import paths have changed. Prefix them with polymer-.

import '@apollo-elements/polymer/apollo-query';
class MyElement extends PolymerElement {
  static get template() {
    return html`
      <apollo-query></apollo-query>
    `
  }
}

import '@apollo-elements/polymer/polymer-apollo-query';
class MyElement extends PolymerElement {
  static get template() {
    return html`
      <polymer-apollo-query></polymer-apollo-query>
    `
  }
}