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interface IBuildRequestHandler {
primaryEntity: boolean
requestBody: any
entity: string
dataset: string
table: string
entityDef: Record<string, any>
foreignKey?: string
primaryKey?: string
}
const mapOperatorToSql = (operator: string) => {
const operatorMap = {
equals: '=',
notEquals: '!=',
lessThan: '<',
lessOrEquals: '<=',
greaterThan: '>',
greaterOrEquals: '>=',
includes: 'LIKE',
notIncludes: 'NOT LIKE',
in: 'IN',
notIn: 'NOT IN',
// Add more operators as needed
}
if (operatorMap[operator as keyof typeof operatorMap] === undefined) {
throw new Error(`Operator ${operator} is not supported`)
}
return operatorMap[operator as keyof typeof operatorMap]
}
const formatValueForSql = (value: any) => {
if (typeof value === 'string') {
if (value.includes('(') && value.includes(')')) {
return value
}
return `'${value}'`
}
return value
}
const parseFilterToSql = (filter: any) => {
if (!filter) {
return ''
}
if (filter.or) {
const orConditions = filter.or.map((f) => parseFilterToSql(f))
return `(${orConditions.join(' OR ')})`
}
if (filter.and) {
const andConditions = filter.and.map((f) => parseFilterToSql(f))
return `(${andConditions.join(' AND ')})`
}
if (filter.operator && filter.field && filter.value) {
const { operator, field, value } = filter
if (operator === 'in' || operator === 'notIn') {
return `${formatValueForSql(value)} ${mapOperatorToSql(operator)} UNNEST(${field})`
}
return `${field} ${mapOperatorToSql(operator)} ${formatValueForSql(value)}`
}
return ''
}
const defineQueryHandler = (props: IBuildRequestHandler) => {
try {
const {
primaryEntity,
requestBody,
entity,
dataset,
table,
primaryKey,
foreignKey,
entityDef,
} = props
let query = '',
metaQuery = ''
// Always retrieve all fields. We will remove unwanted
// fields after building relationships.
query = `SELECT * FROM ${dataset}.${table}`
metaQuery = `SELECT COUNT(*) AS count FROM ${dataset}.${table}`
/**
* Filter handler
*/
if (
(requestBody.filter && requestBody.filter[entity]) ||
primaryKey ||
foreignKey
) {
if (requestBody.filter && requestBody.filter[entity]) {
query += ' WHERE '
query += parseFilterToSql(requestBody.filter[entity])
metaQuery += ' WHERE '
metaQuery += parseFilterToSql(requestBody.filter[entity])
}
if (primaryKey || foreignKey) {
const relationshipType = entityDef.type
if (relationshipType === 'has-many' && foreignKey) {
if (query.indexOf('WHERE') === -1) {
query += ' WHERE '
} else {
query += ' AND '
}
query += `${foreignKey} = {{foreignIdentifier}}`
}
if (relationshipType === 'has-one' && primaryKey) {
if (query.indexOf('WHERE') === -1) {
query += ' WHERE '
} else {
query += ' AND '
}
query += `${primaryKey} = {{foreignIdentifier}}`
}
}
}
/* END Filter handler */
/**
* Sort handler
*/
if (requestBody.sort && requestBody.sort[entity]) {
const sorts = requestBody.sort[entity]
query += ' ORDER BY'
for (let i = 0; i < sorts.length; i++) {
const sort = sorts[i]
if (sort[0] === '-') {
query += ` ${sort.slice(1).trim()} DESC`
if (i < sorts.length - 1) {
query += ','
} else {
query += ' '
}
} else {
query += ` ${sort.trim()}`
if (i < sorts.length - 1) {
query += ','
} else {
query += ' '
}
}
}
}
/* END Sort handler */
/**
* Pagination handler
*/
if (
primaryEntity &&
requestBody.pagination &&
requestBody.pagination.size
) {
const size = requestBody.pagination.size
const page = requestBody.pagination.page || 1
const offset = (page - 1) * size
query += ` LIMIT ${size} OFFSET ${offset}`
} else {
query += ' LIMIT 1000'
}
/* END Pagination handler */
return { query, metaQuery }
} catch (error: any) {
throw new CustomError(
`[buildBigQueryDataStoreRequest] ${error.message}`,
400
)
}
}
export default (req: any) => {
try {
const { body, entityDef, path } = req
const pathParts = path.split('/')
const primaryEntity = pathParts[pathParts.length - 1]
const entity = req.params.children ?? req.params.entity
const { repo, dataset, table } = entityDef
const requestBody = body
const response = {
primary: '',
secondary: {},
metaQuery: '',
}
let result = defineQueryHandler({
primaryEntity,
requestBody,
entity,
dataset,
table,
entityDef,
})
response.primary = result.query
response.metaQuery = result.metaQuery
if (req.settings.requestType === 'json') return response
// Includes handler
if (requestBody.includes) {
const includes = requestBody.includes
for (let childEntity of includes) {
response.secondary[childEntity] = {}
childEntity = childEntity.trim()
const childEntityDef = entityDef.relationships[childEntity]
const { dataset, table, foreignKey, primaryKey } = childEntityDef
result = defineQueryHandler({
primaryEntity: false,
requestBody,
entity: childEntity,
dataset,
table,
primaryKey,
foreignKey,
entityDef: childEntityDef,
})
response.secondary[childEntity] = result.query
}
}
return response
} catch (error: any) {
throw new CustomError(`[defineQueryBigQuery] ${error.message}`, 400)
}
}
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