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114 lines
2.4 KiB
114 lines
2.4 KiB
package models
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import (
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"errors"
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"fmt"
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"io"
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"strings"
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)
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// A Tag associates a story with other content, like other stories, logs and more.
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type Tag struct {
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Kind TagKind `bson:"kind"`
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Name string `bson:"name"`
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}
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func (tag *Tag) Decode(v string) error {
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split := strings.SplitN(v, ":", 2)
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if len(split) == 1 {
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return errors.New("bad tag name: " + v)
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}
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kind := TagKind("")
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err := kind.UnmarshalGQL(v)
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if err != nil {
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return err
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}
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tag.Kind = kind
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tag.Name = split[1]
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return nil
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}
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func (tag *Tag) String() string {
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return string(tag.Kind) + ":" + tag.Name
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}
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// Equal returns true if the tags match one another.
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func (tag *Tag) Equal(other Tag) bool {
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return tag.Kind == other.Kind && tag.Name == other.Name
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}
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// IsChangeObject is an interface implementation to identify it as a valid
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// ChangeObject in GQL.
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func (*Tag) IsChangeObject() {
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panic("this method is a dummy, and so is its caller")
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}
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func EncodeTagArray(arr []Tag) []string {
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result := make([]string, len(arr))
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for i, v := range arr {
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result[i] = v.String()
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}
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return result
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}
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func DecodeTagArray(arr []string) ([]Tag, error) {
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result := make([]Tag, len(arr))
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for i, v := range arr {
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err := result[i].Decode(v)
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if err != nil {
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return nil, err
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}
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}
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return result, nil
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}
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// TagKind represents the kind of tags.
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type TagKind string
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const (
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// TagKindOrganization is a tag kind, see GraphQL documentation.
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TagKindOrganization TagKind = "Organization"
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// TagKindCharacter is a tag kind, see GraphQL documentation.
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TagKindCharacter TagKind = "Character"
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// TagKindLocation is a tag kind, see GraphQL documentation.
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TagKindLocation TagKind = "Location"
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// TagKindEvent is a tag kind, see GraphQL documentation.
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TagKindEvent TagKind = "Event"
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// TagKindSeries is a tag kind, see GraphQL documentation.
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TagKindSeries TagKind = "Series"
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)
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// UnmarshalGQL unmarshals
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func (e *TagKind) UnmarshalGQL(v interface{}) error {
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str, ok := v.(string)
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if !ok {
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return fmt.Errorf("enums must be strings")
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}
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*e = TagKind(str)
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switch *e {
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case TagKindOrganization, TagKindCharacter, TagKindLocation, TagKindEvent, TagKindSeries:
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return nil
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default:
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return fmt.Errorf("%s is not a valid TagKind", str)
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}
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}
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// MarshalGQL turns it into a JSON string
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func (e TagKind) MarshalGQL(w io.Writer) {
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_, _ = fmt.Fprintf(w, "\"%s\"", string(e))
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}
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// TagFilter is a filter for tag listing.
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type TagFilter struct {
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Kind *TagKind `bson:"kind,omitempty"`
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}
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