diff --git a/src/main/scala/fr/loicknuchel/safeql/Field.scala b/src/main/scala/fr/loicknuchel/safeql/Field.scala
index 2188942..739c301 100644
--- a/src/main/scala/fr/loicknuchel/safeql/Field.scala
+++ b/src/main/scala/fr/loicknuchel/safeql/Field.scala
@@ -132,35 +132,18 @@ object SqlField {
     new SqlField(table, name, JdbcInfo(nullable, index, jdbcType, jdbcDeclaration), None)
 
   def apply[A, T <: Table.SqlTable, T2 <: Table.SqlTable](table: T, name: String, jdbcDeclaration: String, jdbcType: JdbcType, nullable: Boolean, index: Int, references: SqlField[A, T2]): SqlFieldRef[A, T, T2] =
-    new SqlFieldRef(table, name, JdbcInfo(nullable, index, jdbcType, jdbcDeclaration), None, references)
+    SqlFieldRef(table, name, JdbcInfo(nullable, index, jdbcType, jdbcDeclaration), None, references)
 
   case class JdbcInfo(nullable: Boolean, index: Int, jdbcType: JdbcType, jdbcDeclaration: String)
 
 }
 
-class SqlFieldRef[A, T <: Table.SqlTable, T2 <: Table.SqlTable](override val table: T,
-                                                                override val name: String,
-                                                                override val info: SqlField.JdbcInfo,
-                                                                override val alias: Option[String],
-                                                                val references: SqlField[A, T2]) extends SqlField[A, T](table, name, info, alias) {
+case class SqlFieldRef[A, T <: Table.SqlTable, T2 <: Table.SqlTable](override val table: T,
+                                                                     override val name: String,
+                                                                     override val info: SqlField.JdbcInfo,
+                                                                     override val alias: Option[String],
+                                                                     references: SqlField[A, T2]) extends SqlField[A, T](table, name, info, alias) {
   override def toString: String = s"SqlFieldRef(${table.getName}.$name, ${references.table.getName}.${references.name})"
-
-  override def canEqual(other: Any): Boolean = other.isInstanceOf[SqlFieldRef[_, _, _]]
-
-  override def equals(other: Any): Boolean = other match {
-    case that: SqlFieldRef[_, _, _] =>
-      super.equals(that) &&
-        (that canEqual this) &&
-        table == that.table &&
-        name == that.name &&
-        references == that.references
-    case _ => false
-  }
-
-  override def hashCode(): Int = {
-    val state: List[Any] = List(super.hashCode(), table, name, references)
-    state.map(_.hashCode()).foldLeft(0)((a, b) => 31 * a + b)
-  }
 }
 
 case class TableField[A](name: String, table: Option[String] = None, alias: Option[String] = None) extends Field[A] {
diff --git a/src/main/scala/fr/loicknuchel/safeql/Query.scala b/src/main/scala/fr/loicknuchel/safeql/Query.scala
index dd3b389..2606077 100644
--- a/src/main/scala/fr/loicknuchel/safeql/Query.scala
+++ b/src/main/scala/fr/loicknuchel/safeql/Query.scala
@@ -12,6 +12,7 @@ import doobie.util.{Put, Read}
 import fr.loicknuchel.safeql.Field.Order
 import fr.loicknuchel.safeql.Query.Inner._
 import fr.loicknuchel.safeql.Table.Sort
+import fr.loicknuchel.safeql.models._
 import fr.loicknuchel.safeql.utils.Extensions._
 
 import scala.util.control.NonFatal
diff --git a/src/main/scala/fr/loicknuchel/safeql/Table.scala b/src/main/scala/fr/loicknuchel/safeql/Table.scala
index 6b769dd..f4d58c0 100644
--- a/src/main/scala/fr/loicknuchel/safeql/Table.scala
+++ b/src/main/scala/fr/loicknuchel/safeql/Table.scala
@@ -11,6 +11,7 @@ import fr.loicknuchel.safeql.Query.Inner._
 import fr.loicknuchel.safeql.Query.{Delete, Insert, Select, Update}
 import fr.loicknuchel.safeql.Table.Inner._
 import fr.loicknuchel.safeql.Table.{Join, JoinTable, Sort}
+import fr.loicknuchel.safeql.models.{ConflictingTableFields, Exceptions, NotImplementedJoin, UnknownTableFields}
 
 import scala.language.dynamics
 
diff --git a/src/main/scala/fr/loicknuchel/safeql/gen/Generator.scala b/src/main/scala/fr/loicknuchel/safeql/gen/Generator.scala
index 929d1d8..17e1673 100644
--- a/src/main/scala/fr/loicknuchel/safeql/gen/Generator.scala
+++ b/src/main/scala/fr/loicknuchel/safeql/gen/Generator.scala
@@ -5,9 +5,9 @@ import java.util.UUID
 import cats.effect.IO
 import doobie.Update0
 import doobie.syntax.connectionio._
-import fr.loicknuchel.safeql.FailedScript
 import fr.loicknuchel.safeql.gen.reader.{H2Reader, Reader}
 import fr.loicknuchel.safeql.gen.writer.Writer
+import fr.loicknuchel.safeql.models.FailedScript
 import fr.loicknuchel.safeql.utils.Extensions._
 import fr.loicknuchel.safeql.utils.FileUtils
 import org.flywaydb.core.Flyway
diff --git a/src/main/scala/fr/loicknuchel/safeql/Exceptions.scala b/src/main/scala/fr/loicknuchel/safeql/models/Exceptions.scala
similarity index 74%
rename from src/main/scala/fr/loicknuchel/safeql/Exceptions.scala
rename to src/main/scala/fr/loicknuchel/safeql/models/Exceptions.scala
index 456fa43..4a50dea 100644
--- a/src/main/scala/fr/loicknuchel/safeql/Exceptions.scala
+++ b/src/main/scala/fr/loicknuchel/safeql/models/Exceptions.scala
@@ -1,8 +1,9 @@
-package fr.loicknuchel.safeql
+package fr.loicknuchel.safeql.models
 
 import cats.data.NonEmptyList
 import doobie.util.Read
 import doobie.util.fragment.Fragment
+import fr.loicknuchel.safeql.{Cond, Field, SqlField, Table}
 
 object Exceptions {
   def check[A, T <: Table](fields: List[Field[_]], table: T, value: => A): A =
@@ -37,3 +38,17 @@ case class FailedScript(script: String, cause: Throwable)
 
 case class NotImplementedJoin[T <: Table, T2 <: Table](t: T, t2: T2)
   extends Exception(s"Join between ${t.sql} and ${t2.sql} is not implemented")
+
+case class MultiException(errs: NonEmptyList[Throwable]) extends RuntimeException {
+  override def getMessage: String = errs.toList.map(e => s"\n  - ${e.getMessage}").mkString
+
+  override def getLocalizedMessage: String = errs.toList.map(e => s"\n  - ${e.getLocalizedMessage}").mkString
+
+  override def getStackTrace: Array[StackTraceElement] = errs.head.getStackTrace
+
+  override def getCause: Throwable = errs.head.getCause
+}
+
+object MultiException {
+  def apply(err: Throwable, others: Throwable*): MultiException = new MultiException(NonEmptyList(err, others.toList))
+}
diff --git a/src/main/scala/fr/loicknuchel/safeql/Page.scala b/src/main/scala/fr/loicknuchel/safeql/models/Page.scala
similarity index 87%
rename from src/main/scala/fr/loicknuchel/safeql/Page.scala
rename to src/main/scala/fr/loicknuchel/safeql/models/Page.scala
index 20e1dda..d632ac8 100644
--- a/src/main/scala/fr/loicknuchel/safeql/Page.scala
+++ b/src/main/scala/fr/loicknuchel/safeql/models/Page.scala
@@ -1,9 +1,8 @@
-package fr.loicknuchel.safeql
+package fr.loicknuchel.safeql.models
 
 import cats.data.NonEmptyList
-import fr.loicknuchel.safeql.Page.Params
 
-case class Page[A](items: List[A], params: Params, total: Long)
+case class Page[A](items: List[A], params: Page.Params, total: Long)
 
 object Page {
 
diff --git a/src/main/scala/fr/loicknuchel/safeql/utils/Extensions.scala b/src/main/scala/fr/loicknuchel/safeql/utils/Extensions.scala
index 88da544..20f40ca 100644
--- a/src/main/scala/fr/loicknuchel/safeql/utils/Extensions.scala
+++ b/src/main/scala/fr/loicknuchel/safeql/utils/Extensions.scala
@@ -6,6 +6,7 @@ import cats.effect.IO
 import doobie.syntax.string._
 import doobie.util.fragment.Fragment
 import doobie.util.fragment.Fragment.const0
+import fr.loicknuchel.safeql.models.MultiException
 
 import scala.collection.generic.CanBuildFrom
 import scala.collection.mutable
diff --git a/src/main/scala/fr/loicknuchel/safeql/utils/MultiException.scala b/src/main/scala/fr/loicknuchel/safeql/utils/MultiException.scala
deleted file mode 100644
index 75c959a..0000000
--- a/src/main/scala/fr/loicknuchel/safeql/utils/MultiException.scala
+++ /dev/null
@@ -1,17 +0,0 @@
-package fr.loicknuchel.safeql.utils
-
-import cats.data.NonEmptyList
-
-case class MultiException(errs: NonEmptyList[Throwable]) extends RuntimeException {
-  override def getMessage: String = errs.toList.map(e => s"\n  - ${e.getMessage}").mkString
-
-  override def getLocalizedMessage: String = errs.toList.map(e => s"\n  - ${e.getLocalizedMessage}").mkString
-
-  override def getStackTrace: Array[StackTraceElement] = errs.head.getStackTrace
-
-  override def getCause: Throwable = errs.head.getCause
-}
-
-object MultiException {
-  def apply(err: Throwable, others: Throwable*): MultiException = new MultiException(NonEmptyList(err, others.toList))
-}
diff --git a/src/test/scala/fr/loicknuchel/safeql/QuerySpec.scala b/src/test/scala/fr/loicknuchel/safeql/QuerySpec.scala
index 50c267c..c114f9e 100644
--- a/src/test/scala/fr/loicknuchel/safeql/QuerySpec.scala
+++ b/src/test/scala/fr/loicknuchel/safeql/QuerySpec.scala
@@ -6,6 +6,7 @@ import cats.data.NonEmptyList
 import doobie.util.Put
 import doobie.util.meta.Meta
 import fr.loicknuchel.safeql.Query.Inner._
+import fr.loicknuchel.safeql.models.Page
 import fr.loicknuchel.safeql.testingutils.BaseSpec
 import fr.loicknuchel.safeql.testingutils.Entities.{Category, User}
 import fr.loicknuchel.safeql.testingutils.database.Tables.{CATEGORIES, POSTS, USERS}
diff --git a/src/test/scala/fr/loicknuchel/safeql/TableSpec.scala b/src/test/scala/fr/loicknuchel/safeql/TableSpec.scala
index c44c601..69c4372 100644
--- a/src/test/scala/fr/loicknuchel/safeql/TableSpec.scala
+++ b/src/test/scala/fr/loicknuchel/safeql/TableSpec.scala
@@ -1,5 +1,6 @@
 package fr.loicknuchel.safeql
 
+import fr.loicknuchel.safeql.models.NotImplementedJoin
 import fr.loicknuchel.safeql.testingutils.BaseSpec
 import fr.loicknuchel.safeql.testingutils.database.Tables.{CATEGORIES, FEATURED, POSTS, USERS}
 
diff --git a/src/test/scala/fr/loicknuchel/safeql/utils/MultiExceptionSpec.scala b/src/test/scala/fr/loicknuchel/safeql/models/MultiExceptionSpec.scala
similarity index 93%
rename from src/test/scala/fr/loicknuchel/safeql/utils/MultiExceptionSpec.scala
rename to src/test/scala/fr/loicknuchel/safeql/models/MultiExceptionSpec.scala
index 6ce1e6a..9da9480 100644
--- a/src/test/scala/fr/loicknuchel/safeql/utils/MultiExceptionSpec.scala
+++ b/src/test/scala/fr/loicknuchel/safeql/models/MultiExceptionSpec.scala
@@ -1,4 +1,4 @@
-package fr.loicknuchel.safeql.utils
+package fr.loicknuchel.safeql.models
 
 import fr.loicknuchel.safeql.testingutils.BaseSpec
 
diff --git a/src/test/scala/fr/loicknuchel/safeql/utils/ExtensionsSpec.scala b/src/test/scala/fr/loicknuchel/safeql/utils/ExtensionsSpec.scala
index 0337eb3..219cc24 100644
--- a/src/test/scala/fr/loicknuchel/safeql/utils/ExtensionsSpec.scala
+++ b/src/test/scala/fr/loicknuchel/safeql/utils/ExtensionsSpec.scala
@@ -4,6 +4,7 @@ import cats.data.NonEmptyList
 import cats.effect.IO
 import doobie.syntax.string._
 import doobie.util.fragment.Fragment
+import fr.loicknuchel.safeql.models.MultiException
 import fr.loicknuchel.safeql.testingutils.BaseSpec
 import fr.loicknuchel.safeql.utils.Extensions._