Fix migration if executed two or more times

src/main/kotlin/fr/postgresjson/migration/Migrations.kt

@@ -1,7 +1,6 @@
 package fr.postgresjson.migration
 
 import com.fasterxml.jackson.core.type.TypeReference
-import com.github.jasync.sql.db.util.size
 import fr.postgresjson.connexion.Connection
 import fr.postgresjson.definition.Function.FunctionNotFound
 import fr.postgresjson.entity.Entity
@@ -39,13 +38,23 @@ data class Migrations private constructor(
     private val queries: MutableMap<String, Query> = mutableMapOf(),
     private val functions: MutableMap<String, Function> = mutableMapOf()
 ) {
+    private var directories: List<File> = emptyList()
     private val logger: Logger? by LoggerDelegate()
     constructor(directory: File, connection: Connection): this(listOf(directory), connection)
 
     constructor(directories: List<File>, connection: Connection): this(connection) {
         initDB()
+        this.directories = directories
+        reset()
+    }
+
+    fun reset() {
+        queries.clear()
+        functions.clear()
+
         getMigrationFromDB()
         getMigrationFromDirectory(directories)
+
         queries.forEach { (_, query) ->
             if (query.doExecute === null) {
                 query.doExecute = Action.DOWN
@@ -97,11 +106,11 @@ data class Migrations private constructor(
             it.isFile
         }.forEach { file ->
             if (file.name.endsWith(".up.sql")) {
-                file.path.substring(0, file.path.size - 7).let {
+                file.path.substring(0, file.path.length - 7).let {
                     try {
                         val down = File("$it.down.sql").readText()
                         val up = file.readText()
-                        val name = file.name.substring(0, file.name.size - 7)
+                        val name = file.name.substring(0, file.name.length - 7)
                         addQuery(name, up, down)
                     } catch (e: FileNotFoundException) {
                         throw DownMigrationNotDefined("$it.down.sql", e)
@@ -244,6 +253,7 @@ data class Migrations private constructor(
             sendQuery("COMMIT")
         }
         logger?.info("Migration done")
+        reset()
 
         return list.toMap()
     }
@@ -264,6 +274,7 @@ data class Migrations private constructor(
             sendQuery("COMMIT")
         }
         logger?.info("Migration DOWN done")
+        reset()
 
         return list.toMap()
     }