Source file src/github.com/vektah/gqlparser/v2/validator/rules/unique_directives_per_location.go

Documentation: github.com/vektah/gqlparser/v2/validator/rules

     1  package validator
     2  
     3  import (
     4  	"github.com/vektah/gqlparser/v2/ast"
     5  
     6  	//nolint:revive // Validator rules each use dot imports for convenience.
     7  	. "github.com/vektah/gqlparser/v2/validator"
     8  )
     9  
    10  func init() {
    11  	AddRule("UniqueDirectivesPerLocation", func(observers *Events, addError AddErrFunc) {
    12  		observers.OnDirectiveList(func(walker *Walker, directives []*ast.Directive) {
    13  			seen := map[string]bool{}
    14  
    15  			for _, dir := range directives {
    16  				if dir.Name != "repeatable" && seen[dir.Name] {
    17  					addError(
    18  						Message(`The directive "@%s" can only be used once at this location.`, dir.Name),
    19  						At(dir.Position),
    20  					)
    21  				}
    22  				seen[dir.Name] = true
    23  			}
    24  		})
    25  	})
    26  }
    27  

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