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1 | // Translate for example "-name" to [ [ 'name', 'DESC' ], [ 'id', 'ASC' ] ] | |
2 | import { Sequelize } from 'sequelize-typescript' | |
3 | ||
4 | function getSort (value: string, lastSort: string[] = [ 'id', 'ASC' ]) { | |
5 | let field: any | |
6 | let direction: 'ASC' | 'DESC' | |
7 | ||
8 | if (value.substring(0, 1) === '-') { | |
9 | direction = 'DESC' | |
10 | field = value.substring(1) | |
11 | } else { | |
12 | direction = 'ASC' | |
13 | field = value | |
14 | } | |
15 | ||
16 | // Alias | |
17 | if (field.toLowerCase() === 'match') field = Sequelize.col('similarity') | |
18 | ||
19 | return [ [ field, direction ], lastSort ] | |
20 | } | |
21 | ||
22 | function getSortOnModel (model: any, value: string, lastSort: string[] = [ 'id', 'ASC' ]) { | |
23 | let [ firstSort ] = getSort(value) | |
24 | ||
25 | if (model) return [ [ model, firstSort[0], firstSort[1] ], lastSort ] | |
26 | return [ firstSort, lastSort ] | |
27 | } | |
28 | ||
29 | function throwIfNotValid (value: any, validator: (value: any) => boolean, fieldName = 'value') { | |
30 | if (validator(value) === false) { | |
31 | throw new Error(`"${value}" is not a valid ${fieldName}.`) | |
32 | } | |
33 | } | |
34 | ||
35 | function buildTrigramSearchIndex (indexName: string, attribute: string) { | |
36 | return { | |
37 | name: indexName, | |
38 | fields: [ Sequelize.literal('lower(immutable_unaccent(' + attribute + '))') as any ], | |
39 | using: 'gin', | |
40 | operator: 'gin_trgm_ops' | |
41 | } | |
42 | } | |
43 | ||
44 | function createSimilarityAttribute (col: string, value: string) { | |
45 | return Sequelize.fn( | |
46 | 'similarity', | |
47 | ||
48 | searchTrigramNormalizeCol(col), | |
49 | ||
50 | searchTrigramNormalizeValue(value) | |
51 | ) | |
52 | } | |
53 | ||
54 | // --------------------------------------------------------------------------- | |
55 | ||
56 | export { | |
57 | getSort, | |
58 | getSortOnModel, | |
59 | createSimilarityAttribute, | |
60 | throwIfNotValid, | |
61 | buildTrigramSearchIndex | |
62 | } | |
63 | ||
64 | // --------------------------------------------------------------------------- | |
65 | ||
66 | function searchTrigramNormalizeValue (value: string) { | |
67 | return Sequelize.fn('lower', Sequelize.fn('immutable_unaccent', value)) | |
68 | } | |
69 | ||
70 | function searchTrigramNormalizeCol (col: string) { | |
71 | return Sequelize.fn('lower', Sequelize.fn('immutable_unaccent', Sequelize.col(col))) | |
72 | } |