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29 lines
686 B
29 lines
686 B
package stories
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import (
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"errors"
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"git.aiterp.net/rpdata/api/models"
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"github.com/globalsign/mgo/bson"
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)
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// ErrTagAlreadyExists is an error returned by Story.AddTag
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var ErrTagAlreadyExists = errors.New("Tag already exists on story")
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// AddTag adds a tag to the story. It returns ErrTagAlreadyExists if the tag is already there
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func AddTag(story models.Story, tag models.Tag) (*models.Story, error) {
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for i := range story.Tags {
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if story.Tags[i].Equal(tag) {
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return nil, ErrTagAlreadyExists
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}
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}
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err := collection.UpdateId(story.ID, bson.M{"$push": bson.M{"tags": tag}})
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if err != nil {
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return nil, err
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}
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story.Tags = append(story.Tags, tag)
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return &story, nil
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}
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