Fix: Add getAvailableValues to Postgres parser;

Author: rokmohar

src/dialects/postgres.parser.ts

@@ -9,66 +9,58 @@ const pgArrayAggToArray = (agg: string) => agg.replace(/{/g, '').replace(/}/g, '
 
 const getColumnType = (dbType: string): PropertyType => {
   switch (dbType) {
-  case 'uuid': return 'uuid';
-  case 'bigint':
-  case 'int8':
-  case 'bigserial':
-  case 'serial8':
-  case 'integer':
-  case 'int':
-  case 'int4':
-  case 'smallint':
-  case 'int2':
-  case 'serial':
-  case 'serial4':
-  case 'smallserial':
-  case 'serial2':
-    return 'number';
-  case 'double precision':
-  case 'float8':
-  case 'numeric':
-  case 'decimal':
-  case 'real':
-  case 'float4':
-    return 'float';
-  case 'money':
-    return 'currency';
-  case 'boolean':
-    return 'boolean';
-  case 'time':
-  case 'time with time zone':
-  case 'timetz':
-  case 'time without time zone':
-  case 'timestamp':
-  case 'timestamp with time zone':
-  case 'timestamptz':
-  case 'timestamp without time zone':
-    return 'datetime';
-  case 'date':
-    return 'date';
-  case 'json':
-  case 'jsonb':
-    return 'key-value';
-  case 'text':
-  case 'character varying':
-  case 'char':
-  case 'varchar':
-  default:
-    return 'string';
+    case 'USER-DEFINED':
+      return 'mixed';
+    case 'uuid':
+      return 'uuid';
+    case 'bigint':
+    case 'int8':
+    case 'bigserial':
+    case 'serial8':
+    case 'integer':
+    case 'int':
+    case 'int4':
+    case 'smallint':
+    case 'int2':
+    case 'serial':
+    case 'serial4':
+    case 'smallserial':
+    case 'serial2':
+      return 'number';
+    case 'double precision':
+    case 'float8':
+    case 'numeric':
+    case 'decimal':
+    case 'real':
+    case 'float4':
+      return 'float';
+    case 'money':
+      return 'currency';
+    case 'boolean':
+      return 'boolean';
+    case 'time':
+    case 'time with time zone':
+    case 'timetz':
+    case 'time without time zone':
+    case 'timestamp':
+    case 'timestamp with time zone':
+    case 'timestamptz':
+    case 'timestamp without time zone':
+      return 'datetime';
+    case 'date':
+      return 'date';
+    case 'json':
+    case 'jsonb':
+      return 'key-value';
+    case 'text':
+    case 'character varying':
+    case 'char':
+    case 'varchar':
+    default:
+      return 'string';
   }
 };
 
-const getColumnInfo = (column: Record<string, number | string>): ColumnInfo => ({
-  name: column.column_name as string,
-  isId: column.key_type === 'PRIMARY KEY',
-  position: column.ordinal_position as number,
-  defaultValue: column.column_default,
-  isNullable: column.is_nullable === 'YES',
-  isEditable: column.is_updatable === 'YES',
-  type: column.referenced_table ? 'reference' : getColumnType(column.data_type as string),
-  referencedTable: (column.referenced_table ?? null) as string | null,
-});
-
 export class PostgresParser extends BaseDatabaseParser {
   public static dialects = ['postgresql' as const];
 
@@ -96,10 +88,10 @@ export class PostgresParser extends BaseDatabaseParser {
 
   public async getTables(schemaName: string) {
     const query = await this.knex.raw(`
-      SELECT table_name
-      FROM information_schema.tables
-      WHERE table_type='BASE TABLE'
-      AND table_schema='${schemaName}'
+        SELECT table_name
+        FROM information_schema.tables
+        WHERE table_type='BASE TABLE'
+          AND table_schema='${schemaName}'
     `);
 
     const result = await query;
@@ -177,7 +169,7 @@ export class PostgresParser extends BaseDatabaseParser {
 
     const relations = await relQuery;
 
-    return columns.map((col) => {
+    return Promise.all(columns.map(async (col) => {
       const rel = relations.rows.find((r) => {
         const cols = pgArrayAggToArray(r.col);
         if (cols.length > 1) return null; // AdminJS doesn't support multiple foreign keys
@@ -189,7 +181,35 @@ export class PostgresParser extends BaseDatabaseParser {
         col.referenced_table = rel.referenced_table;
       }
 
-      return new Property(getColumnInfo(col));
-    });
+      return new Property(await  this.getColumnInfo(col));
+    }));
+  }
+
+
+  async getColumnInfo(column: Record<string, number | string>): Promise<ColumnInfo> {
+    return {
+      name: column.column_name as string,
+      isId: column.key_type === 'PRIMARY KEY',
+      position: column.ordinal_position as number,
+      defaultValue: column.column_default,
+      isNullable: column.is_nullable === 'YES',
+      isEditable: column.is_updatable === 'YES',
+      type: column.referenced_table ? ('reference' as PropertyType) : getColumnType(column.data_type as string),
+      referencedTable: (column.referenced_table ?? null) as string | null,
+      availableValues: await this.getAvailableValues(column),
+    }
+  }
+
+  async getAvailableValues(column: Record<string, number | string>): Promise<string[] | null> {
+    if (column.data_type !== 'USER-DEFINED' || !column.udt_name) {
+      return null;
+    }
+    const query = this.knex
+      .from('pg_catalog.pg_enum as e')
+      .select('e.enumlabel')
+      .leftJoin('pg_catalog.pg_type as t', (c) => c.on('e.enumtypid', 't.oid'))
+      .where('t.typname', column.udt_name);
+    const labels = await query;
+    return labels.map((l) => l.enumlabel as string)
   }
 }