Source file src/github.com/vektah/gqlparser/validator/rules/single_field_subscriptions.go

Documentation: github.com/vektah/gqlparser/validator/rules

     1  package validator
     2  
     3  import (
     4  	"strconv"
     5  
     6  	"github.com/vektah/gqlparser/ast"
     7  	. "github.com/vektah/gqlparser/validator"
     8  )
     9  
    10  func init() {
    11  	AddRule("SingleFieldSubscriptions", func(observers *Events, addError AddErrFunc) {
    12  		observers.OnOperation(func(walker *Walker, operation *ast.OperationDefinition) {
    13  			if operation.Operation != ast.Subscription {
    14  				return
    15  			}
    16  
    17  			if len(operation.SelectionSet) > 1 {
    18  				name := "Anonymous Subscription"
    19  				if operation.Name != "" {
    20  					name = `Subscription ` + strconv.Quote(operation.Name)
    21  				}
    22  
    23  				addError(
    24  					Message(`%s must select only one top level field.`, name),
    25  					At(operation.SelectionSet[1].GetPosition()),
    26  				)
    27  			}
    28  		})
    29  	})
    30  }
    31  

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