84 lines
2.3 KiB
TypeScript
84 lines
2.3 KiB
TypeScript
// Translate for example "-name" to [ [ 'name', 'DESC' ], [ 'id', 'ASC' ] ]
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import { Sequelize } from 'sequelize-typescript'
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function getSort (value: string, lastSort: string[] = [ 'id', 'ASC' ]) {
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let field: any
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let direction: 'ASC' | 'DESC'
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if (value.substring(0, 1) === '-') {
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direction = 'DESC'
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field = value.substring(1)
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} else {
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direction = 'ASC'
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field = value
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}
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// Alias
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if (field.toLowerCase() === 'bestmatch') field = Sequelize.col('similarity')
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return [ [ field, direction ], lastSort ]
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}
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function getSortOnModel (model: any, value: string, lastSort: string[] = [ 'id', 'ASC' ]) {
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let [ firstSort ] = getSort(value)
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if (model) return [ [ model, firstSort[0], firstSort[1] ], lastSort ]
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return [ firstSort, lastSort ]
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}
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function throwIfNotValid (value: any, validator: (value: any) => boolean, fieldName = 'value') {
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if (validator(value) === false) {
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throw new Error(`"${value}" is not a valid ${fieldName}.`)
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}
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}
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function buildTrigramSearchIndex (indexName: string, attribute: string) {
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return {
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name: indexName,
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fields: [ Sequelize.literal('lower(immutable_unaccent(' + attribute + '))') as any ],
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using: 'gin',
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operator: 'gin_trgm_ops'
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}
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}
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function createSimilarityAttribute (col: string, value: string) {
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return Sequelize.fn(
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'similarity',
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searchTrigramNormalizeCol(col),
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searchTrigramNormalizeValue(value)
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)
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}
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function createSearchTrigramQuery (col: string, value: string) {
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return {
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[ Sequelize.Op.or ]: [
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// FIXME: use word_similarity instead of just similarity?
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Sequelize.where(searchTrigramNormalizeCol(col), ' % ', searchTrigramNormalizeValue(value)),
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Sequelize.where(searchTrigramNormalizeCol(col), ' LIKE ', searchTrigramNormalizeValue(`%${value}%`))
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]
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}
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}
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// ---------------------------------------------------------------------------
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export {
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getSort,
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getSortOnModel,
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createSimilarityAttribute,
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throwIfNotValid,
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buildTrigramSearchIndex,
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createSearchTrigramQuery
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}
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// ---------------------------------------------------------------------------
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function searchTrigramNormalizeValue (value: string) {
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return Sequelize.fn('lower', Sequelize.fn('unaccent', value))
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}
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function searchTrigramNormalizeCol (col: string) {
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return Sequelize.fn('lower', Sequelize.fn('immutable_unaccent', Sequelize.col(col)))
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}
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