add postgres dialect support for homelab migration

server/utils/sqlDialectHelpers.js

@@ -0,0 +1,75 @@
+function getDialect(sequelize) {
+  if (!sequelize) return 'sqlite'
+  if (typeof sequelize.getDialect === 'function') return sequelize.getDialect()
+  return sequelize.dialect?.name || 'sqlite'
+}
+
+function isPostgres(sequelize) {
+  return getDialect(sequelize) === 'postgres'
+}
+
+function booleanLiteral(value, sequelize) {
+  if (isPostgres(sequelize)) return value ? 'TRUE' : 'FALSE'
+  return value ? '1' : '0'
+}
+
+function noCaseSortExpression(columnExpression, sequelize) {
+  if (isPostgres(sequelize)) return `LOWER(${columnExpression})`
+  return `${columnExpression} COLLATE NOCASE`
+}
+
+function coalesceFunctionName(sequelize) {
+  return isPostgres(sequelize) ? 'COALESCE' : 'IFNULL'
+}
+
+function jsonArrayContainsAny(columnExpression, bindName, sequelize) {
+  if (isPostgres(sequelize)) {
+    return `(SELECT count(*) FROM jsonb_array_elements_text(COALESCE(${columnExpression}::jsonb, '[]'::jsonb)) AS json_each(value) WHERE json_each.value IN (:${bindName}))`
+  }
+  return `(SELECT count(*) FROM json_each(${columnExpression}) WHERE json_valid(${columnExpression}) AND json_each.value IN (:${bindName}))`
+}
+
+function jsonArrayContainsValue(columnExpression, bindName, sequelize) {
+  if (isPostgres(sequelize)) {
+    return `(SELECT count(*) FROM jsonb_array_elements_text(COALESCE(${columnExpression}::jsonb, '[]'::jsonb)) AS json_each(value) WHERE json_each.value = :${bindName})`
+  }
+  return `(SELECT count(*) FROM json_each(${columnExpression}) WHERE json_valid(${columnExpression}) AND json_each.value = :${bindName})`
+}
+
+function jsonArrayExpand(columnExpression, sequelize, options = {}) {
+  const alias = options.alias || 'json_each'
+  const textValues = options.textValues !== false
+  if (isPostgres(sequelize)) {
+    const fn = textValues ? 'jsonb_array_elements_text' : 'jsonb_array_elements'
+    return `${fn}(COALESCE(${columnExpression}::jsonb, '[]'::jsonb)) AS ${alias}(value)`
+  }
+  return `json_each(${columnExpression})`
+}
+
+function jsonPathText(columnExpression, pathSegments, sequelize) {
+  const path = Array.isArray(pathSegments) ? pathSegments : [pathSegments]
+  if (isPostgres(sequelize)) {
+    return `${columnExpression}::jsonb #>> '{${path.join(',')}}'`
+  }
+  return `json_extract(${columnExpression}, '$.${path.join('.')}')`
+}
+
+function jsonPathNumber(columnExpression, pathSegments, sequelize) {
+  if (isPostgres(sequelize)) {
+    return `NULLIF(${jsonPathText(columnExpression, pathSegments, sequelize)}, '')::double precision`
+  }
+  return `json_extract(${columnExpression}, '$.${[].concat(pathSegments).join('.')}')`
+}
+
+module.exports = {
+  getDialect,
+  isPostgres,
+  booleanLiteral,
+  noCaseSortExpression,
+  coalesceFunctionName,
+  jsonArrayContainsAny,
+  jsonArrayContainsValue,
+  jsonArrayExpand,
+  jsonPathText,
+  jsonPathNumber
+}