chore! EXPOSED-655 Join column default fields defaultValueFun, defaul…

…tValueInDb, isDatabaseGenerated into one field

documentation-website/Writerside/topics/Breaking-Changes.md

@@ -24,6 +24,20 @@
   -- Starting from version 0.57.0
   INSERT INTO TEST DEFAULT VALUES
   ```
+
+* The fields `defaultValueFun`, `dbDefaultValue`, and `isDatabaseGenerated` have been consolidated into a single field, 
+  `default`, of type `ColumnDefault`. The previous setup with the three separate fields often led to inconsistencies 
+  and confusion regarding their various combinations.
+
+  Here’s how you can migrate the common combinations:
+  - `defaultValueFun != null && dbDefaultValue != null` (knows as `default()`) becomes `DatabaseColumnDefaultExpressionWithValue`
+  - `dbDefaultValue != null` (knows as `defaultExpression()`) becomes `DatabaseColumnDefaultExpression`
+  - `defaultValueFun != null` (knows as `clientDefault()`) becomes `ClientColumnDefaultValue`
+  - `isDatabaseGenerated == true` (knows as `databaseGenerated`) becomes `DatabaseGeneratedColumnDefault`
+
+  If it is anticipated that a column will be transformed using `transform()`, 
+  the default value for that column should implement `TransformableColumnDefault`. However, not all defaults need to 
+  implement this interface; it is primarily necessary for columns with in-memory Kotlin values.
 
 ## 0.56.0
 * If the `distinct` parameter of `groupConcat()` is set to `true`, when using Oracle or SQL Server, this will now fail early with an

exposed-core/api/exposed-core.api

@@ -413,6 +413,15 @@ public final class org/jetbrains/exposed/sql/CheckConstraint : org/jetbrains/exp
 public final class org/jetbrains/exposed/sql/CheckConstraint$Companion {
 }
 
+public abstract interface class org/jetbrains/exposed/sql/ClientColumnDefault : org/jetbrains/exposed/sql/ColumnDefault {
+}
+
+public final class org/jetbrains/exposed/sql/ClientColumnDefaultValue : org/jetbrains/exposed/sql/ClientColumnDefault, org/jetbrains/exposed/sql/ColumnDefaultValue, org/jetbrains/exposed/sql/TransformableColumnDefault {
+	public fun <init> (Lkotlin/jvm/functions/Function0;)V
+	public fun getValue ()Lkotlin/jvm/functions/Function0;
+	public fun transform (Lkotlin/jvm/functions/Function1;)Lorg/jetbrains/exposed/sql/ColumnDefault;
+}
+
 public final class org/jetbrains/exposed/sql/Coalesce : org/jetbrains/exposed/sql/Function {
 	public fun <init> (Lorg/jetbrains/exposed/sql/ExpressionWithColumnType;Lorg/jetbrains/exposed/sql/Expression;[Lorg/jetbrains/exposed/sql/Expression;)V
 	public fun toQueryBuilder (Lorg/jetbrains/exposed/sql/QueryBuilder;)V
@@ -423,32 +432,54 @@ public final class org/jetbrains/exposed/sql/Column : org/jetbrains/exposed/sql/
 	public synthetic fun compareTo (Ljava/lang/Object;)I
 	public fun compareTo (Lorg/jetbrains/exposed/sql/Column;)I
 	public fun createStatement ()Ljava/util/List;
-	public final fun defaultValueInDb ()Lorg/jetbrains/exposed/sql/Expression;
 	public final fun descriptionDdl (Z)Ljava/lang/String;
 	public static synthetic fun descriptionDdl$default (Lorg/jetbrains/exposed/sql/Column;ZILjava/lang/Object;)Ljava/lang/String;
 	public fun dropStatement ()Ljava/util/List;
 	public fun equals (Ljava/lang/Object;)Z
 	public fun getColumnType ()Lorg/jetbrains/exposed/sql/IColumnType;
 	public fun getDdl ()Ljava/util/List;
-	public final fun getDefaultValueFun ()Lkotlin/jvm/functions/Function0;
+	public final fun getDefault ()Lorg/jetbrains/exposed/sql/ColumnDefault;
 	public final fun getForeignKey ()Lorg/jetbrains/exposed/sql/ForeignKeyConstraint;
 	public final fun getName ()Ljava/lang/String;
 	public final fun getReferee ()Lorg/jetbrains/exposed/sql/Column;
 	public final fun getTable ()Lorg/jetbrains/exposed/sql/Table;
 	public fun hashCode ()I
-	public final fun isDatabaseGenerated ()Z
 	public fun modifyStatement ()Ljava/util/List;
 	public final fun modifyStatements (Lorg/jetbrains/exposed/sql/ColumnDiff;)Ljava/util/List;
 	public final fun nameInDatabaseCase ()Ljava/lang/String;
 	public final fun nameUnquoted ()Ljava/lang/String;
 	public final fun referee ()Lorg/jetbrains/exposed/sql/Column;
-	public final fun setDefaultValueFun (Lkotlin/jvm/functions/Function0;)V
+	public final fun setDefault (Lorg/jetbrains/exposed/sql/ColumnDefault;)V
 	public final fun setForeignKey (Lorg/jetbrains/exposed/sql/ForeignKeyConstraint;)V
 	public fun toQueryBuilder (Lorg/jetbrains/exposed/sql/QueryBuilder;)V
 	public fun toString ()Ljava/lang/String;
 	public final fun withColumnType (Lorg/jetbrains/exposed/sql/IColumnType;)Lorg/jetbrains/exposed/sql/Column;
 }
 
+public abstract interface class org/jetbrains/exposed/sql/ColumnDefault {
+}
+
+public abstract interface class org/jetbrains/exposed/sql/ColumnDefaultExpression : org/jetbrains/exposed/sql/ColumnDefault {
+	public abstract fun getExpression ()Lorg/jetbrains/exposed/sql/Expression;
+}
+
+public final class org/jetbrains/exposed/sql/ColumnDefaultKt {
+	public static final fun clientDefaultValue (Lorg/jetbrains/exposed/sql/Column;)Ljava/lang/Object;
+	public static final fun clientDefaultValueOrExpression (Lorg/jetbrains/exposed/sql/Column;)Ljava/lang/Object;
+	public static final fun databaseDefaultExpression (Lorg/jetbrains/exposed/sql/Column;)Lorg/jetbrains/exposed/sql/Expression;
+	public static final fun defaultValue (Lorg/jetbrains/exposed/sql/Column;)Ljava/lang/Object;
+	public static final fun hasClientDefault (Lorg/jetbrains/exposed/sql/Column;)Z
+	public static final fun hasClientDefaultValue (Lorg/jetbrains/exposed/sql/Column;)Z
+	public static final fun hasDatabaseDefault (Lorg/jetbrains/exposed/sql/Column;)Z
+	public static final fun hasDefaultValue (Lorg/jetbrains/exposed/sql/Column;)Z
+	public static final fun isDefaultable (Lorg/jetbrains/exposed/sql/Column;)Z
+	public static final fun transform (Lorg/jetbrains/exposed/sql/ColumnDefault;Lkotlin/jvm/functions/Function1;)Lorg/jetbrains/exposed/sql/ColumnDefault;
+}
+
+public abstract interface class org/jetbrains/exposed/sql/ColumnDefaultValue : org/jetbrains/exposed/sql/ColumnDefault {
+	public abstract fun getValue ()Lkotlin/jvm/functions/Function0;
+}
+
 public final class org/jetbrains/exposed/sql/ColumnDiff {
 	public static final field Companion Lorg/jetbrains/exposed/sql/ColumnDiff$Companion;
 	public fun <init> (ZZZZZ)V
@@ -688,6 +719,21 @@ public final class org/jetbrains/exposed/sql/Database$Companion {
 	public final fun registerJdbcDriver (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V
 }
 
+public abstract interface class org/jetbrains/exposed/sql/DatabaseColumnDefault : org/jetbrains/exposed/sql/ColumnDefault {
+}
+
+public final class org/jetbrains/exposed/sql/DatabaseColumnDefaultExpression : org/jetbrains/exposed/sql/ColumnDefaultExpression, org/jetbrains/exposed/sql/DatabaseColumnDefault {
+	public fun <init> (Lorg/jetbrains/exposed/sql/Expression;)V
+	public fun getExpression ()Lorg/jetbrains/exposed/sql/Expression;
+}
+
+public final class org/jetbrains/exposed/sql/DatabaseColumnDefaultExpressionWithValue : org/jetbrains/exposed/sql/ColumnDefaultExpression, org/jetbrains/exposed/sql/ColumnDefaultValue, org/jetbrains/exposed/sql/DatabaseColumnDefault, org/jetbrains/exposed/sql/TransformableColumnDefault {
+	public fun <init> (Lorg/jetbrains/exposed/sql/Expression;Lkotlin/jvm/functions/Function0;)V
+	public fun getExpression ()Lorg/jetbrains/exposed/sql/Expression;
+	public fun getValue ()Lkotlin/jvm/functions/Function0;
+	public fun transform (Lkotlin/jvm/functions/Function1;)Lorg/jetbrains/exposed/sql/ColumnDefault;
+}
+
 public final class org/jetbrains/exposed/sql/DatabaseConfig {
 	public static final field Companion Lorg/jetbrains/exposed/sql/DatabaseConfig$Companion;
 	public synthetic fun <init> (Lorg/jetbrains/exposed/sql/SqlLogger;ZLjava/lang/Integer;IIJJIJJZLjava/lang/Long;IZLorg/jetbrains/exposed/sql/vendors/DatabaseDialect;Lorg/jetbrains/exposed/sql/Schema;IZLkotlin/jvm/internal/DefaultConstructorMarker;)V
@@ -761,6 +807,10 @@ public final class org/jetbrains/exposed/sql/DatabaseConfig$Companion {
 public abstract interface class org/jetbrains/exposed/sql/DatabaseConnectionAutoRegistration : kotlin/jvm/functions/Function1 {
 }
 
+public final class org/jetbrains/exposed/sql/DatabaseGeneratedColumnDefault : org/jetbrains/exposed/sql/DatabaseColumnDefault {
+	public fun <init> ()V
+}
+
 public final class org/jetbrains/exposed/sql/DatabaseKt {
 	public static final fun getName (Lorg/jetbrains/exposed/sql/Database;)Ljava/lang/String;
 }
@@ -2712,6 +2762,10 @@ public class org/jetbrains/exposed/sql/Transaction : org/jetbrains/exposed/sql/U
 public final class org/jetbrains/exposed/sql/Transaction$Companion {
 }
 
+public abstract interface class org/jetbrains/exposed/sql/TransformableColumnDefault : org/jetbrains/exposed/sql/ColumnDefault {
+	public abstract fun transform (Lkotlin/jvm/functions/Function1;)Lorg/jetbrains/exposed/sql/ColumnDefault;
+}
+
 public final class org/jetbrains/exposed/sql/Trim : org/jetbrains/exposed/sql/Function {
 	public fun <init> (Lorg/jetbrains/exposed/sql/Expression;)V
 	public final fun getExpr ()Lorg/jetbrains/exposed/sql/Expression;
@@ -3210,7 +3264,7 @@ public class org/jetbrains/exposed/sql/statements/InsertStatement : org/jetbrain
 	public final fun getResultedValues ()Ljava/util/List;
 	public final fun getTable ()Lorg/jetbrains/exposed/sql/Table;
 	protected fun isColumnValuePreferredFromResultSet (Lorg/jetbrains/exposed/sql/Column;Ljava/lang/Object;)Z
-	protected final fun isEntityIdClientSideGeneratedUUID (Lorg/jetbrains/exposed/sql/Column;)Z
+	protected final fun isEntityIdClientSideGeneratedUUID (Lorg/jetbrains/exposed/sql/Column;)Ljava/lang/Boolean;
 	public final fun isIgnore ()Z
 	public fun prepareSQL (Lorg/jetbrains/exposed/sql/Transaction;Z)Ljava/lang/String;
 	public fun prepared (Lorg/jetbrains/exposed/sql/Transaction;Ljava/lang/String;)Lorg/jetbrains/exposed/sql/statements/api/PreparedStatementApi;

exposed-core/src/main/kotlin/org/jetbrains/exposed/dao/id/IdTable.kt

@@ -140,7 +140,7 @@ open class CompositeIdTable(name: String = "") : IdTable<CompositeID>(name) {
             }
         )
         return Column(this, "composite_id", EntityIDColumnType(placeholder)).apply {
-            defaultValueFun = null
+            default = null
         }
     }
 

exposed-core/src/main/kotlin/org/jetbrains/exposed/sql/Alias.kt

@@ -18,9 +18,7 @@ class Alias<out T : Table>(val delegate: T, val alias: String) : Table() {
     val tableNameWithAlias: String = "${delegate.tableName} $alias"
 
     private fun <T> Column<T>.clone() = Column<T>(this@Alias, name, columnType).also {
-        it.defaultValueFun = defaultValueFun
-        it.dbDefaultValue = dbDefaultValue
-        it.isDatabaseGenerated = isDatabaseGenerated
+        it.default = default
         it.foreignKey = foreignKey
         it.extraDefinitions = extraDefinitions
     }

exposed-core/src/main/kotlin/org/jetbrains/exposed/sql/Column.kt

@@ -28,17 +28,10 @@ class Column<T>(
     @Suppress("UNCHECKED_CAST")
     fun <S : T> referee(): Column<S>? = referee as? Column<S>
 
-    /** Returns the function that calculates the default value for this column. */
-    var defaultValueFun: (() -> T)? = null
-    internal var dbDefaultValue: Expression<T>? = null
-
-    /** Returns the default value for this column on the database-side. */
-    fun defaultValueInDb() = dbDefaultValue
-
-    internal var isDatabaseGenerated: Boolean = false
-
-    /** Returns whether this column's value will be generated in the database. */
-    fun isDatabaseGenerated() = isDatabaseGenerated
+    /**
+     * The default value for this column.
+     */
+    var default: ColumnDefault<T>? = null
 
     internal var extraDefinitions = mutableListOf<Any>()
 
@@ -121,12 +114,13 @@ class Column<T>(
             else -> append(columnType.sqlType())
         }
 
-        val defaultValue = dbDefaultValue
-        if (defaultValue != null) {
-            val expressionSQL = currentDialect.dataTypeProvider.processForDefaultValue(defaultValue)
-            if (!currentDialect.isAllowedAsColumnDefault(defaultValue)) {
+        val defaultDatabaseValue = databaseDefaultExpression()
+
+        if (defaultDatabaseValue != null) {
+            val expressionSQL = currentDialect.dataTypeProvider.processForDefaultValue(defaultDatabaseValue)
+            if (!currentDialect.isAllowedAsColumnDefault(defaultDatabaseValue)) {
                 val clientDefault = when {
-                    defaultValueFun != null && dbDefaultValue == null -> " Expression will be evaluated on the client."
+                    hasClientDefault() -> " Expression will be evaluated on the client."
                     !columnType.nullable -> " Column will be created with NULL marker."
                     else -> ""
                 }
@@ -148,7 +142,7 @@ class Column<T>(
             append(extraDefinitions.joinToString(separator = " ", prefix = " ") { "$it" })
         }
 
-        if (columnType.nullable || (defaultValue != null && defaultValueFun == null && !currentDialect.isAllowedAsColumnDefault(defaultValue))) {
+        if (columnType.nullable || (defaultDatabaseValue != null && !currentDialect.isAllowedAsColumnDefault(defaultDatabaseValue))) {
             append(" NULL")
         } else if (!isPKColumn || (currentDialect is SQLiteDialect && !isSQLiteAutoIncColumn)) {
             append(" NOT NULL")
@@ -163,14 +157,10 @@ class Column<T>(
         val newColumn: Column<R> = Column(table, name, columnType)
         newColumn.foreignKey = foreignKey
         @Suppress("UNCHECKED_CAST")
-        newColumn.dbDefaultValue = dbDefaultValue as Expression<R>?
-        newColumn.isDatabaseGenerated = isDatabaseGenerated
+        newColumn.default = default as ColumnDefault<R>?
         newColumn.extraDefinitions = extraDefinitions
         body?.let { newColumn.it() }
 
-        if (defaultValueFun != null) {
-            require(newColumn.defaultValueFun != null) { "defaultValueFun was lost on cloning the column" }
-        }
         return newColumn
     }
 
@@ -183,9 +173,7 @@ class Column<T>(
         columnType = columnType
     ).also {
         it.foreignKey = this.foreignKey
-        it.defaultValueFun = this.defaultValueFun
-        it.dbDefaultValue = this.dbDefaultValue
-        it.isDatabaseGenerated = this.isDatabaseGenerated
+        it.default = this.default
         it.extraDefinitions = this.extraDefinitions
     }