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How to Send Array Of Strings As Argument In Graphql Query?

6 minutes read

To send an array of strings as an argument in a GraphQL query, you can define the argument as a list in your schema definition and pass an array of strings when making the query. In the query variables, you can specify the argument as an array of strings using the appropriate syntax. This way, you can pass multiple strings as an argument to your GraphQL query for processing by the server.


What is the best practice for sending an array of strings in a GraphQL query?

The best practice for sending an array of strings in a GraphQL query is to use the List type in the GraphQL schema definition. In the schema, you can define a custom scalar type for a list of strings and then use this custom type in your query. Here is an example of how you can define a custom scalar type for a list of strings in your GraphQL schema:

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scalar StringList

type Query {
  searchItems(keywords: StringList!): [Item]
}


In this example, the StringList custom scalar type represents a list of strings. The searchItems query takes a parameter keywords of type StringList that represents a list of keywords to search for.


When sending a query with an array of strings, you need to specify the values as an array in the query variables. Here is an example of how you can send a query with an array of strings:

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query SearchItems($keywords: StringList!) {
  searchItems(keywords: $keywords) {
    name
    category
  }
}


And the corresponding query variables:

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{
  "keywords": ["keyword1", "keyword2", "keyword3"]
}


By following this approach, you can easily send arrays of strings in a GraphQL query and ensure that the data is correctly mapped to the schema.


How to format an array of strings in a GraphQL argument?

In GraphQL, when passing an array of strings as an argument, you can format it as follows:

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query {
  queryName(argumentName: ["string1", "string2", "string3"]) {
    field1
    field2
  }
}


You can replace "queryName" with the name of your query, "argumentName" with the name of the argument in your schema, and "field1" and "field2" with the fields you want to fetch.


Make sure to enclose each string in double quotes and separate them with commas within the square brackets. This is the standard way to pass an array of strings as an argument in GraphQL.


What is the significance of sending an array of strings in a GraphQL query?

Sending an array of strings in a GraphQL query can be significant for various reasons.

  1. Filtering and Sorting: By sending an array of strings, you can filter and sort the data based on the values in the array. This can be useful for querying specific data that matches the values provided.
  2. Including Multiple Values: An array of strings allows you to pass multiple values for a single field in a single query. This can simplify the query and reduce the number of API calls needed to retrieve the desired data.
  3. Dynamic Queries: Sending an array of strings allows for more dynamic and flexible queries, where the values in the array can be changed or updated at runtime to request different sets of data from the server.
  4. Subscription Queries: In some cases, sending an array of strings can be used to subscribe to specific events or updates from the server. By passing in an array of values, you can receive real-time updates for multiple entities at once.


Overall, sending an array of strings in a GraphQL query provides more flexibility and control over the data being requested and can help optimize the query process for both the client and the server.


How to define an array of strings as an argument in a GraphQL schema?

In a GraphQL schema, you can define an array of strings as an argument by using square brackets [] around the data type of the argument. Here is an example of how you can define an array of strings as an argument in a GraphQL schema:

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type Query {
  searchByKeywords(keywords: [String]): [String]
}


In this example, the searchByKeywords query accepts an argument called keywords, which is an array of strings. The query then returns an array of strings as its response. You can customize the name of the argument and the response according to your requirements.


What are the steps to include an array of strings in a GraphQL query?

To include an array of strings in a GraphQL query, you can follow these steps:

  1. Define a type for the array of strings in your GraphQL schema. This can be done by adding a new type definition in your schema file. For example, you can define a type called "StringArray" with a field named "values" that is an array of strings:
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type StringArray {
  values: [String]!
}


  1. Add a field in your query that returns the array of strings. You can include this field in an existing query or create a new query specifically for retrieving the array of strings. For example, you can add a field named "stringArray" to your query:
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type Query {
  stringArray: StringArray
}


  1. Implement a resolver function for the new field in your GraphQL server. The resolver function should return an object with the array of strings. For example, the resolver function for the "stringArray" field can return an object with a field "values" containing an array of strings:
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const resolvers = {
  Query: {
    stringArray: () => {
      return {
        values: ["string1", "string2", "string3"]
      };
    }
  }
};


  1. Update your GraphQL query to include the new field for the array of strings. You can now include the "stringArray" field in your GraphQL query along with any other fields you want to retrieve:
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query {
  stringArray {
    values
  }
}


  1. Execute the updated GraphQL query to retrieve the array of strings. When you execute the query, the resolver function will be called to fetch the array of strings, and the response will contain the array of strings in the "values" field of the "stringArray" object.


What is the role of an array of strings in a GraphQL query?

An array of strings in a GraphQL query is used to represent a list of values for a field. This can be useful when querying for multiple values of the same type, such as a list of IDs or names. The array syntax allows you to specify multiple values in a concise manner, making the query more efficient and easier to read.


For example, if you have a field called "users" that returns a list of user objects, you can use an array of strings to specify which users you want to retrieve:

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query {
  users(ids: ["123", "456", "789"]) {
    id
    name
    email
  }
}


In this query, we are requesting the user objects with IDs "123", "456", and "789". The array of strings allows us to specify multiple IDs in a single query, making it more efficient than sending individual requests for each user.

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