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

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

     1  package validator
     2  
     3  import (
     4  	"github.com/vektah/gqlparser/ast"
     5  	. "github.com/vektah/gqlparser/validator"
     6  )
     7  
     8  func init() {
     9  	AddRule("UniqueDirectivesPerLocation", func(observers *Events, addError AddErrFunc) {
    10  		observers.OnDirectiveList(func(walker *Walker, directives []*ast.Directive) {
    11  			seen := map[string]bool{}
    12  
    13  			for _, dir := range directives {
    14  				if seen[dir.Name] {
    15  					addError(
    16  						Message(`The directive "%s" can only be used once at this location.`, dir.Name),
    17  						At(dir.Position),
    18  					)
    19  				}
    20  				seen[dir.Name] = true
    21  			}
    22  		})
    23  	})
    24  }
    25  

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