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// _ _
// __ _____ __ ___ ___ __ _| |_ ___
// \ \ /\ / / _ \/ _` \ \ / / |/ _` | __/ _ \
// \ V V / __/ (_| |\ V /| | (_| | || __/
// \_/\_/ \___|\__,_| \_/ |_|\__,_|\__\___|
//
// Copyright © 2016 - 2024 Weaviate B.V. All rights reserved.
//
// CONTACT: [email protected]
//
package get
import (
"fmt"
"github.com/tailor-inc/graphql"
"github.com/weaviate/weaviate/entities/models"
"github.com/weaviate/weaviate/entities/schema"
"github.com/weaviate/weaviate/entities/search"
"golang.org/x/text/cases"
"golang.org/x/text/language"
)
func (b *classBuilder) referenceField(propertyType schema.PropertyDataType,
property *models.Property, className string,
) *graphql.Field {
refClasses := propertyType.Classes()
propertyName := cases.Title(language.Und, cases.NoLower).String(property.Name)
dataTypeClasses := []*graphql.Object{}
for _, refClassName := range refClasses {
// is a local ref
refClass, ok := b.knownClasses[string(refClassName)]
if !ok {
panic(fmt.Sprintf("buildGetClass: unknown referenced class type for %s.%s; %s",
className, property.Name, refClassName))
}
dataTypeClasses = append(dataTypeClasses, refClass)
}
if (len(dataTypeClasses)) == 0 {
// this could be the case when we only have network-refs, but all network
// refs were invalid (e.g. because the peers are gone). In this case we
// must return (nil) early, otherwise graphql will error because it has a
// union field with an empty list of unions.
return nil
}
dataTypeClasses = append(dataTypeClasses, b.beaconClass)
classUnion := graphql.NewUnion(graphql.UnionConfig{
Name: fmt.Sprintf("%s%s%s", className, propertyName, "Obj"),
Types: dataTypeClasses,
ResolveType: makeResolveClassUnionType(&b.knownClasses),
Description: property.Description,
})
return &graphql.Field{
Type: graphql.NewList(classUnion),
Description: property.Description,
Resolve: makeResolveRefField(),
}
}
func makeResolveClassUnionType(knownClasses *map[string]*graphql.Object) graphql.ResolveTypeFn {
return func(p graphql.ResolveTypeParams) *graphql.Object {
valueMap := p.Value.(map[string]interface{})
refType := valueMap["__refClassType"].(string)
switch refType {
case "local":
className := valueMap["__refClassName"].(string)
classObj, ok := (*knownClasses)[className]
if !ok {
panic(fmt.Errorf(
"local ref refers to class '%s', but no such kind exists in the peer network", className))
}
return classObj
default:
panic(fmt.Sprintf("unknown ref type %#v", refType))
}
}
}
func makeResolveRefField() graphql.FieldResolveFn {
return func(p graphql.ResolveParams) (interface{}, error) {
if p.Source.(map[string]interface{})[p.Info.FieldName] == nil {
return nil, nil
}
items, ok := p.Source.(map[string]interface{})[p.Info.FieldName].([]interface{})
if !ok {
// could be a models.MultipleRef which would indicate that we found only
// unresolved references, this is the case when accepts refs to types
// ClassA and ClassB and the object only contains refs to one type (e.g.
// ClassA). Now if the user only asks for resolving all of the other type
// (i.e. ClassB), then all results would be returned unresolved (as
// models.MultipleRef).
return nil, nil
}
results := make([]interface{}, len(items))
for i, item := range items {
switch v := item.(type) {
case search.LocalRef:
// inject some meta data so the ResolveType can determine the type
localRef := v.Fields
localRef["__refClassType"] = "local"
localRef["__refClassName"] = v.Class
results[i] = localRef
default:
return nil, fmt.Errorf("unsupported type, expected search.LocalRef or NetworkRef, got %T", v)
}
}
return results, nil
}
}
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