inlinefragmentteja

Inlinefragmentteja, commonly referred to as inline fragments, are a feature of GraphQL queries that allow selecting fields conditionally based on the runtime type of a field that can resolve to multiple concrete types, such as interfaces or unions. They enable clients to request type-specific fields without declaring separate reusable fragments.

In GraphQL syntax, an inline fragment is written inside a selection set as ... on TypeName { fields }. A meta field like typename can be included to identify the actual type at runtime, which is useful when handling polymorphic results. For example:

query {

search(query: "ocean") {

typename

... on Photo {

id

url

}

... on Person {

id

name

}

}

}

Inline fragments are the inline counterparts to named fragments. They are defined at the point of use and cannot be reused in other parts of the query. Named fragments, by contrast, declare a fragment with a name and can be spread into multiple selection sets.

Use cases for inline fragments arise when querying fields that implement an interface or belong to a union. They let clients fetch type-specific fields only when those fields exist on the runtime type, reducing over-fetching and keeping queries concise. They are commonly supported by GraphQL clients and servers, including popular implementations like Apollo and Relay.

In practice, inline fragments complement named fragments: use inline fragments for ad hoc, type-specific selections and named fragments when you need to reuse a set of fields across multiple parts of a query.