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4 minutes read
To query GraphQL in React with TypeScript, you typically use a library like Apollo Client. First, you need to set up an ApolloClient instance with the appropriate configurations, including the GraphQL endpoint URL. Then, you can use the useQuery hook provided by Apollo Client in your React component to fetch data from the GraphQL server.When using TypeScript, you can define the types of the data returned by the query using interfaces or type aliases.
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After a GraphQL mutation is performed, the cache can be updated in a couple of ways. One common approach is to use the update function provided by Apollo Client's useMutation hook or client.mutate method. Within this function, you can manually update the cache to reflect the changes made by the mutation.Alternatively, you can use the refetchQueries option in the mutation's configuration to automatically refetch specific queries after the mutation has completed.
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In GraphQL, you can cast a value into a specific type by using type coercion. Type coercion allows you to convert a value from one type to another, such as converting a string into an integer or a boolean.To cast a value into a specific type in GraphQL, you can use built-in scalar types like Int, Float, String, Boolean, ID, etc. When defining a field in your GraphQL schema, you can specify the type of the field using these scalar types.
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In GraphQL, you can format the result of a query by using directives. Directives allow you to apply additional logic or formatting to the result of a query. One common directive that is used for formatting results is the @include directive. This directive allows you to conditionally include or exclude fields from the result of a query based on certain criteria.
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In GraphQL, it is possible to pass an array of arrays as a parameter by defining a custom input type that corresponds to the nested array structure. You can create a new input type that represents an array of arrays, and then use this type as a parameter in your GraphQL queries or mutations.For example, you can define a custom input type called "ArrayOfArraysInput" that represents an array of arrays in your GraphQL schema.
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When deserializing a GraphQL response, you need to first convert the response data into a compatible format in your programming language. This typically involves parsing the JSON data returned in the response and mapping it to objects in your application. Depending on the language you are using, you may need to use libraries or frameworks specifically designed for deserializing JSON data.
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In GraphQL, filtering results can be done by adding arguments to your query fields. These arguments can be used to specify the conditions that the returned data must meet in order to be included in the result set. These arguments can be used in combination with operators like equals, greater than, less than, and others to further refine the query results.
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In GraphQL, the orderBy argument can be used to specify the order in which the results of a query should be sorted. This argument is typically used in conjunction with fields that return an array of items, such as a list of posts or products.To use the orderBy argument, you can add it to the field where you want to apply sorting. The argument takes a list of fields that you want to sort by, along with the direction of the sorting (ascending or descending).
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In order to perform a mutation query in GraphQL in Django, you first need to define a mutation class in your Django application. This mutation class will inherit from the graphene.Mutation class and will include fields that represent the input parameters for the mutation.Next, you will need to define a resolver function for the mutation class. This function will be responsible for executing the desired operation, such as creating, updating, or deleting a record in the database.
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To add an existing custom type to a GraphQL schema, you need to first define the custom type in your schema using the GraphQL schema definition language. This can be done by creating a new GraphQLObjectType and specifying its fields, including any custom scalar types or other custom types that it may reference.