+type SortType = { sortModel: any, sortValue: string }
+
+// Translate for example "-name" to [ [ 'name', 'DESC' ], [ 'id', 'ASC' ] ]
+function getSort (value: string, lastSort: string[] = [ 'id', 'ASC' ]) {
+ let { direction, field } = buildDirectionAndField(value)
+
+ if (field.toLowerCase() === 'match') { // Search
+ field = Sequelize.col('similarity')
+ }
+
+ return [ [ field, direction ], lastSort ]
+}
+
+function getVideoSort (value: string, lastSort: string[] = [ 'id', 'ASC' ]) {
+ let { direction, field } = buildDirectionAndField(value)
+
+ // Alias
+ if (field.toLowerCase() === 'match') { // Search
+ field = Sequelize.col('similarity')
+ } else if (field.toLowerCase() === 'trending') { // Sort by aggregation
+ return [
+ [ Sequelize.fn('COALESCE', Sequelize.fn('SUM', Sequelize.col('VideoViews.views')), '0'), direction ],
+
+ [ Sequelize.col('VideoModel.views'), direction ],
+
+ lastSort
+ ]
+ }
+
+ return [ [ field, direction ], lastSort ]
+}
+
+function getSortOnModel (model: any, value: string, lastSort: string[] = [ 'id', 'ASC' ]) {
+ let [ firstSort ] = getSort(value)
+
+ if (model) return [ [ model, firstSort[0], firstSort[1] ], lastSort ]
+ return [ firstSort, lastSort ]
+}
+
+function throwIfNotValid (value: any, validator: (value: any) => boolean, fieldName = 'value') {
+ if (validator(value) === false) {
+ throw new Error(`"${value}" is not a valid ${fieldName}.`)
+ }
+}
+
+function buildTrigramSearchIndex (indexName: string, attribute: string) {
+ return {
+ name: indexName,
+ fields: [ Sequelize.literal('lower(immutable_unaccent(' + attribute + '))') as any ],
+ using: 'gin',
+ operator: 'gin_trgm_ops'