GraphQL API and utilities for the rpdata project
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package stories
import ( "errors"
"git.aiterp.net/rpdata/api/models" "github.com/globalsign/mgo/bson" )
// ErrTagNotExists is an error returned by Story.RemoveTag
var ErrTagNotExists = errors.New("Tag does not exist on story")
// RemoveTag removes a tag to the story. It returns ErrTagNotExists if the tag does not exist.
func RemoveTag(story models.Story, tag models.Tag) (*models.Story, error) { index := -1 for i := range story.Tags { if story.Tags[i].Equal(tag) { index = i break } } if index == -1 { return nil, ErrTagNotExists }
err := collection.UpdateId(story.ID, bson.M{"$pull": bson.M{"tags": tag}}) if err != nil { return nil, err }
story.Tags = append(story.Tags[:index], story.Tags[index+1:]...)
return &story, nil }
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