Add support for Managed, Virtual, Key and null checks

lib/pg/Service.js

@@ -83,11 +83,8 @@ module.exports = class PostgresDatabase extends cds.DatabaseService {
     // "flattens" the query
     // and "redirects" modification statements (CUD) from view to actual table
     this.before(['CREATE', 'UPDATE'], '*', dateTime) // > has to run before rewrite
-
-    // TODO: Where to move this?
-    //this.before(['CREATE', 'UPDATE'], '*', keys)
-    //this.before(['CREATE', 'UPDATE'], '*', managed)
-    //this.before(['CREATE', 'UPDATE'], '*', virtual)
+    // VIRTUAL, MANAGED, Keys and null checks
+    this.before(['CREATE', 'UPDATE'], '*', this._input)
 
     this.before(['CREATE', 'READ', 'UPDATE', 'DELETE'], '*', rewrite)
     //this.before(['CREATE', 'READ', 'UPDATE', 'DELETE'], '*', this.setModel)
@@ -164,6 +161,10 @@ module.exports = class PostgresDatabase extends cds.DatabaseService {
   async acquire(arg) {
     // const tenant = (typeof arg === 'string' ? arg : arg.user.tenant) || 'anonymous'
     const dbc = await this._pool.connect()
+    // SET SCHEMA
+    if (this.options.credentials && this.options.credentials.schema) {
+      dbc.query(`SET search_path TO '${this.options.credentials.schema}';`)
+    }
     return dbc
   }