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Autocomplete is also available as an experimental widget in InstantSearch, making it easier to integrate into your search experience. To learn more, see the API reference for InstantSearch.js or React InstantSearch.
When you’re browsing a website that fetches content from a database, the UI isn’t fully representative of how that data is structured on the backend. This allows more human-friendly experiences and interactions. A search UI doesn’t have to be a one-to-one mapping with your search engine either. Autocomplete lets you transform static, dynamic, and asynchronous sources into a friendlier search UI. Here are some examples of what you can do with the Reshape API:
  • Apply a limit of items for a group of sources
  • Remove duplicates in a group of sources
  • Group sources by an attribute
  • Sort sources
In this guide, you’ll learn how to use multiple reshape functions to remove duplicates and create a shared limit for your autocomplete suggestions.

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Create a reshape function

To remove duplicates between sources, you can start by creating a uniqBy function. You can later apply this function to your recent searches and Query Suggestions sources.
JavaScript
function uniqBy(predicate) {
  return function runUniqBy(...rawSources) {
    const sources = rawSources.flat().filter(Boolean);
    const seen = new Set();

    return sources.map((source) => {
      const items = source.getItems().filter((item) => {
        const appliedItem = predicate({ source, item });
        const hasSeen = seen.has(appliedItem);

        seen.add(appliedItem);

        return !hasSeen;
      });

      return {
        ...source,
        getItems() {
          return items;
        },
      };
    });
  };
}
Autocomplete supports conditional sources: sources sometimes exist and sometimes don’t. This can happen when you display a source on an empty query but not when users start typing (for example, with popular queries). Your function can support this by removing non-existent sources with filter(Boolean).

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The reshape function

Now that you’ve created the uniqBy function, you can specify the implementation for your sources and use it in the reshape option:
JavaScript
const removeDuplicates = uniqBy(({ source, item }) =>
  source.sourceId === "querySuggestionsPlugin" ? item.query : item.label,
);

autocomplete({
  container: "#autocomplete",
  plugins: [recentSearchesPlugin, querySuggestionsPlugin],
  reshape({ sourcesBySourceId }) {
    const { recentSearchesPlugin, querySuggestionsPlugin, ...rest } =
      sourcesBySourceId;

    return [
      removeDuplicates(recentSearchesPlugin, querySuggestionsPlugin),
      Object.values(rest),
    ];
  },
});
The reshape option provides three arguments:
  • sources: the resolved sources provided by getSources
  • sourcesBySourceId: the resolved sources grouped by sourceId
  • state: the Autocomplete state
The uniqBy function uses item.query as identifier for the Query Suggestions plugin and item.label for the recent searches plugin. These are the shape of the items that the plugins return. If you use custom sources, you can use a switch statement based on source.sourceId. Sources are retrieved from sourcesBySourceId with their sourceId using object destructuring. You can return sources that you didn’t reshape with Object.values(rest).

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Combine reshape functions

You can create a function that combines results from two different sources. Use it with uniqBy to ensure there are no duplicates and there’s a fixed number of combined items. In the video, four results are always displayed and the number of Query Suggestions varies depending on the number of recent searches. Here’s a limit function:
JavaScript
function limit(value) {
  return function runLimit(...rawSources) {
    const sources = rawSources.flat().filter(Boolean);
    const limitPerSource = Math.ceil(value / sources.length);
    let sharedLimitRemaining = value;

    return sources.map((source, index) => {
      const isLastSource = index === sources.length - 1;
      const sourceLimit = isLastSource
        ? sharedLimitRemaining
        : Math.min(limitPerSource, sharedLimitRemaining);
      const items = source.getItems().slice(0, sourceLimit);
      sharedLimitRemaining = Math.max(sharedLimitRemaining - items.length, 0);

      return {
        ...source,
        getItems() {
          return items;
        },
      };
    });
  };
}
Then combine the uniqBy and limit functions:
JavaScript
const removeDuplicates = uniqBy(({ source, item }) =>
  source.sourceId === "querySuggestionsPlugin" ? item.query : item.label,
);
const limitSuggestions = limit(4);

autocomplete({
  container: "#autocomplete",
  plugins: [recentSearchesPlugin, querySuggestionsPlugin],
  reshape({ sourcesBySourceId }) {
    const { recentSearchesPlugin, querySuggestionsPlugin, ...rest } =
      sourcesBySourceId;

    return [
      limitSuggestions(
        removeDuplicates(recentSearchesPlugin, querySuggestionsPlugin),
      ),
      Object.values(rest),
    ];
  },
});

​
Pipe reshape functions

Nested function calls can become cumbersome, so you can use functional libraries like Ramda to pipe reshape functions instead.
JavaScript
import { pipe } from "ramda";

const combineSuggestions = pipe(
  uniqBy(({ source, item }) =>
    source.sourceId === "querySuggestionsPlugin" ? item.query : item.label,
  ),
  limit(4),
);

autocomplete({
  container: "#autocomplete",
  plugins: [recentSearchesPlugin, querySuggestionsPlugin],
  reshape({ sourcesBySourceId }) {
    const { recentSearchesPlugin, querySuggestionsPlugin, ...rest } =
      sourcesBySourceId;

    return [
      combineSuggestions(recentSearchesPlugin, querySuggestionsPlugin),
      Object.values(rest),
    ];
  },
});
For your reshape functions to support pipe, you need to make sure your sources are one level deep, for example using Array.flat.
You can find an example that groups products by category with the Reshape API in the sandboxes.