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1 | import { Sequelize } from 'sequelize-typescript' | |
2 | ||
3 | type SortType = { sortModel: any, sortValue: string } | |
4 | ||
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) | |
8 | ||
9 | if (field.toLowerCase() === 'match') { // Search | |
10 | field = Sequelize.col('similarity') | |
11 | } | |
12 | ||
13 | return [ [ field, direction ], lastSort ] | |
14 | } | |
15 | ||
16 | function getVideoSort (value: string, lastSort: string[] = [ 'id', 'ASC' ]) { | |
17 | let { direction, field } = buildDirectionAndField(value) | |
18 | ||
19 | // Alias | |
20 | if (field.toLowerCase() === 'match') { // Search | |
21 | field = Sequelize.col('similarity') | |
22 | } else if (field.toLowerCase() === 'trending') { // Sort by aggregation | |
23 | return [ | |
24 | [ Sequelize.fn('COALESCE', Sequelize.fn('SUM', Sequelize.col('VideoViews.views')), '0'), direction ], | |
25 | ||
26 | [ Sequelize.col('VideoModel.views'), direction ], | |
27 | ||
28 | lastSort | |
29 | ] | |
30 | } | |
31 | ||
32 | return [ [ field, direction ], lastSort ] | |
33 | } | |
34 | ||
35 | function getSortOnModel (model: any, value: string, lastSort: string[] = [ 'id', 'ASC' ]) { | |
36 | let [ firstSort ] = getSort(value) | |
37 | ||
38 | if (model) return [ [ model, firstSort[0], firstSort[1] ], lastSort ] | |
39 | return [ firstSort, lastSort ] | |
40 | } | |
41 | ||
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}.`) | |
45 | } | |
46 | } | |
47 | ||
48 | function buildTrigramSearchIndex (indexName: string, attribute: string) { | |
49 | return { | |
50 | name: indexName, | |
51 | fields: [ Sequelize.literal('lower(immutable_unaccent(' + attribute + '))') as any ], | |
52 | using: 'gin', | |
53 | operator: 'gin_trgm_ops' | |
54 | } | |
55 | } | |
56 | ||
57 | function createSimilarityAttribute (col: string, value: string) { | |
58 | return Sequelize.fn( | |
59 | 'similarity', | |
60 | ||
61 | searchTrigramNormalizeCol(col), | |
62 | ||
63 | searchTrigramNormalizeValue(value) | |
64 | ) | |
65 | } | |
66 | ||
67 | // --------------------------------------------------------------------------- | |
68 | ||
69 | export { | |
70 | SortType, | |
71 | getSort, | |
72 | getVideoSort, | |
73 | getSortOnModel, | |
74 | createSimilarityAttribute, | |
75 | throwIfNotValid, | |
76 | buildTrigramSearchIndex | |
77 | } | |
78 | ||
79 | // --------------------------------------------------------------------------- | |
80 | ||
81 | function searchTrigramNormalizeValue (value: string) { | |
82 | return Sequelize.fn('lower', Sequelize.fn('immutable_unaccent', value)) | |
83 | } | |
84 | ||
85 | function searchTrigramNormalizeCol (col: string) { | |
86 | return Sequelize.fn('lower', Sequelize.fn('immutable_unaccent', Sequelize.col(col))) | |
87 | } | |
88 | ||
89 | function buildDirectionAndField (value: string) { | |
90 | let field: any | |
91 | let direction: 'ASC' | 'DESC' | |
92 | ||
93 | if (value.substring(0, 1) === '-') { | |
94 | direction = 'DESC' | |
95 | field = value.substring(1) | |
96 | } else { | |
97 | direction = 'ASC' | |
98 | field = value | |
99 | } | |
100 | ||
101 | return { direction, field } | |
102 | } |