func storiesByKeys(g *cayley.Handle, keys []string) []*Story {
stories := make([]*Story, 0, len(keys))
it, _ := cayley.StartPath(g, keys...).Save(StoryID, StoryID).Save(StoryTitle, StoryTitle).Save(StoryDescription, StoryDescription).Save(SiteID, SiteID).BuildIterator().Optimize()
defer it.Close()
for cayley.RawNext(it) {
s := Story{}
results := map[string]graph.Value{}
it.TagResults(results)
s.Id = atoi(g.NameOf(results[StoryID]))
s.Title = g.NameOf(results[StoryTitle])
s.Desc = g.NameOf(results[StoryDescription])
s.Site = Site(Site_value[g.NameOf(results[SiteID])])
s.annotate()
stories = append(stories, &s)
}
return stories
}
// viewIDs retrieves the item IDs associated with the view.
func viewIDs(v *view.View, path *path.Path, key string, graphDB *cayley.Handle) ([]string, embeddedRels, error) {
// Build the Cayley iterator.
it := path.BuildIterator()
it, _ = it.Optimize()
defer it.Close()
// tagOrder will allow us to look up the ordering of a tag or
// the tag corresponding to an order on demand.
tagOrder := make(map[string]string)
// Extract any tags and the ordering in the View value.
var viewTags []string
for idx, pth := range v.Paths {
alias := strconv.Itoa(idx+1) + "_"
for _, segment := range pth.Segments {
if segment.Tag != "" {
viewTags = append(viewTags, alias+segment.Tag)
tagOrder[alias+segment.Tag] = alias + strconv.Itoa(segment.Level)
tagOrder[alias+strconv.Itoa(segment.Level)] = alias + segment.Tag
}
}
}
// Retrieve the end path and tagged item IDs.
var ids []string
var embeds embeddedRels
for it.Next() {
// Tag the results.
resultTags := make(map[string]graph.Value)
it.TagResults(resultTags)
// Extract the tagged item IDs.
taggedIDs := make(map[string]relList)
for _, tag := range viewTags {
if t, ok := resultTags[tag]; ok {
// Append the view item ID.
ids = append(ids, quad.NativeOf(graphDB.NameOf(t)).(string))
// Add the tagged ID to the tagged map for embedded
// relationship extraction.
current, ok := taggedIDs[tag]
if !ok {
taggedIDs[tag] = []string{quad.NativeOf(graphDB.NameOf(t)).(string)}
continue
}
updated := append(current, quad.NativeOf(graphDB.NameOf(t)).(string))
taggedIDs[tag] = updated
}
}
// Extract any IDs that need to be embedded in view items.
embed, err := extractEmbeddedRels(v, taggedIDs, tagOrder, key)
if err != nil {
return ids, embeds, err
}
embeds = append(embeds, embed...)
}
if it.Err() != nil {
return ids, embeds, it.Err()
}
// Remove duplicates.
found := make(map[string]bool)
j := 0
for i, x := range ids {
if !found[x] {
found[x] = true
ids[j] = ids[i]
j++
}
}
ids = ids[:j]
// Add root item.
if v.ReturnRoot == true {
ids = append(ids, key)
}
return ids, embeds, nil
}