add convenience for psql db

Author: tanner0101

Diff for: Sources/FluentPostgreSQL/SchemaBuilder+PostgreSQL.swift

@@ -1,22 +1,19 @@
-//extension SchemaBuilder {
-//    public func field<T>(for keyPath: KeyPath<Model, T>, type: PostgreSQLColumnType, primaryKey: Bool? = nil, generatedByDefaultAsIdentity: Bool = false, notNull: Bool = true, default: String? = nil) {
-//        var attributes: [String] = []
-//        if let primaryKey = primaryKey {
-//            if primaryKey {
-//                attributes.append("PRIMARY KEY")
-//            }
-//        } else if keyPath == Model.idKey {
-//            attributes.append("PRIMARY KEY")
-//        }
-//        if generatedByDefaultAsIdentity {
-//            attributes.append("GENERATED BY DEFAULT AS IDENTITY")
-//        }
-//        if notNull {
-//            attributes.append("NOT NULL")
-//        }
-//        if let `default` = `default` {
-//            attributes.append("DEFAULT " + `default`)
-//        }
-//        field(for: .fluentProperty(.keyPath(keyPath)), type: .init(name: type.name, parameters: type.parameters, attributes: attributes))
-//    }
-//}
+extension SchemaBuilder where Model.Database == PostgreSQLDatabase {
+    public func field<T>(
+        for keyPath: KeyPath<Model, T>,
+        type dataType: PostgreSQLQuery.DataType,
+        isArray: Bool = false,
+        collate: String? = nil,
+        _ constraints: PostgreSQLQuery.ColumnConstraint...
+    ) {
+        let property = FluentProperty.keyPath(keyPath)
+        let columnDefinition = PostgreSQLQuery.ColumnDefinition.init(
+            name: property.path[0],
+            dataType: dataType,
+            isArray: isArray,
+            collate: collate,
+            constraints: constraints
+        )
+        schema.createColumns.append(columnDefinition)
+    }
+}

Diff for: Tests/FluentPostgreSQLTests/FluentPostgreSQLTests.swift

@@ -175,7 +175,7 @@ class FluentPostgreSQLTests: XCTestCase {
 
             static func prepare(on conn: PostgreSQLConnection) -> EventLoopFuture<Void> {
                 return PostgreSQLDatabase.create(Pet.self, on: conn) { builder in
-                    builder.field(for: \.id, isIdentifier: true)
+                    builder.field(for: \.id, type: .bigint, .notNull, .primaryKey, .generated(.byDefault))
                     builder.field(for: \.type, type: .bigint)
                     builder.field(for: \.name, type: .text)
                 }