Firestore-Sammlung mit einem „array_contains“-Filter abfragen
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Firestore-Sammlung mit einem „array_contains“-Filter abfragen
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[[["Leicht verständlich","easyToUnderstand","thumb-up"],["Mein Problem wurde gelöst","solvedMyProblem","thumb-up"],["Sonstiges","otherUp","thumb-up"]],[["Schwer verständlich","hardToUnderstand","thumb-down"],["Informationen oder Beispielcode falsch","incorrectInformationOrSampleCode","thumb-down"],["Benötigte Informationen/Beispiele nicht gefunden","missingTheInformationSamplesINeed","thumb-down"],["Problem mit der Übersetzung","translationIssue","thumb-down"],["Sonstiges","otherDown","thumb-down"]],[],[[["\u003cp\u003eThis content demonstrates how to query a Firestore collection using the \u003ccode\u003earray_contains\u003c/code\u003e filter.\u003c/p\u003e\n"],["\u003cp\u003eCode samples are provided in C#, Go, Java, Node.js, PHP, Python, and Ruby, illustrating the \u003ccode\u003earray_contains\u003c/code\u003e functionality.\u003c/p\u003e\n"],["\u003cp\u003eThe examples query a "cities" collection to find documents where the "regions" array contains "west_coast".\u003c/p\u003e\n"],["\u003cp\u003eThe documentation requires you to set up Application Default Credentials for authentication when accessing Firestore.\u003c/p\u003e\n"]]],[],null,["# Query a Firestore collection with an array_contains filter\n\nExplore further\n---------------\n\n\nFor detailed documentation that includes this code sample, see the following:\n\n- [Perform simple and compound queries in Cloud Firestore](https://firebase.google.com/docs/firestore/query-data/queries)\n- [Query and filter data](/firestore/native/docs/query-data/queries)\n\nCode sample\n-----------\n\n### C#\n\n\nTo authenticate to Firestore, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n CollectionReference citiesRef = db.Collection(\"cities\");\n Query query = citiesRef.WhereArrayContains(\"Regions\", \"west_coast\");\n\n### Go\n\n\nTo authenticate to Firestore, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n query := cities.Where(\"regions\", \"array-contains\", \"west_coast\").Documents(ctx)\n\n### Java\n\n\nTo authenticate to Firestore, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n CollectionReference citiesRef = db.collection(\"cities\");\n Query westCoastQuery = citiesRef.whereArrayContains(\"regions\", \"west_coast\");\n\n### Node.js\n\n\nTo authenticate to Firestore, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n const westCoastCities = citiesRef.where('regions', 'array-contains',\n 'west_coast').get();\n\n### PHP\n\n\nTo authenticate to Firestore, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n $containsQuery = $citiesRef-\u003ewhere('regions', 'array-contains', 'west_coast');\n\n### Python\n\n\nTo authenticate to Firestore, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n cities_ref = db.collection(\"cities\")\n\n query = cities_ref.where(\n filter=FieldFilter(\"regions\", \"array_contains\", \"west_coast\")\n )\n\n### Ruby\n\n\nTo authenticate to Firestore, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n cities_ref = firestore.col collection_path\n cities = cities_ref.where \"regions\", \"array-contains\", \"west_coast\"\n\nWhat's next\n-----------\n\n\nTo search and filter code samples for other Google Cloud products, see the\n[Google Cloud sample browser](/docs/samples?product=firestore)."]]
