1 import { Sequelize } from 'sequelize-typescript'
3 type SortType = { sortModel: any, sortValue: string }
5 // Translate for example "-name" to [ [ 'name', 'DESC' ], [ 'id', 'ASC' ] ]
6 function getSort (value: string, lastSort: string[] = [ 'id', 'ASC' ]) {
7 let { direction, field } = buildDirectionAndField(value)
9 if (field.toLowerCase() === 'match') { // Search
10 field = Sequelize.col('similarity')
13 return [ [ field, direction ], lastSort ]
16 function getVideoSort (value: string, lastSort: string[] = [ 'id', 'ASC' ]) {
17 let { direction, field } = buildDirectionAndField(value)
20 if (field.toLowerCase() === 'match') { // Search
21 field = Sequelize.col('similarity')
22 } else if (field.toLowerCase() === 'trending') { // Sort by aggregation
24 [ Sequelize.fn('COALESCE', Sequelize.fn('SUM', Sequelize.col('VideoViews.views')), '0'), direction ],
26 [ Sequelize.col('VideoModel.views'), direction ],
32 return [ [ field, direction ], lastSort ]
35 function getSortOnModel (model: any, value: string, lastSort: string[] = [ 'id', 'ASC' ]) {
36 let [ firstSort ] = getSort(value)
38 if (model) return [ [ model, firstSort[0], firstSort[1] ], lastSort ]
39 return [ firstSort, lastSort ]
42 function throwIfNotValid (value: any, validator: (value: any) => boolean, fieldName = 'value') {
43 if (validator(value) === false) {
44 throw new Error(`"${value}" is not a valid ${fieldName}.`)
48 function buildTrigramSearchIndex (indexName: string, attribute: string) {
51 fields: [ Sequelize.literal('lower(immutable_unaccent(' + attribute + '))') as any ],
53 operator: 'gin_trgm_ops'
57 function createSimilarityAttribute (col: string, value: string) {
61 searchTrigramNormalizeCol(col),
63 searchTrigramNormalizeValue(value)
67 // ---------------------------------------------------------------------------
74 createSimilarityAttribute,
76 buildTrigramSearchIndex
79 // ---------------------------------------------------------------------------
81 function searchTrigramNormalizeValue (value: string) {
82 return Sequelize.fn('lower', Sequelize.fn('immutable_unaccent', value))
85 function searchTrigramNormalizeCol (col: string) {
86 return Sequelize.fn('lower', Sequelize.fn('immutable_unaccent', Sequelize.col(col)))
89 function buildDirectionAndField (value: string) {
91 let direction: 'ASC' | 'DESC'
93 if (value.substring(0, 1) === '-') {
95 field = value.substring(1)
101 return { direction, field }