diff --git a/core/src/main/scala/lightdb/Field.scala b/core/src/main/scala/lightdb/Field.scala
index 31879186..b6a05916 100644
--- a/core/src/main/scala/lightdb/Field.scala
+++ b/core/src/main/scala/lightdb/Field.scala
@@ -24,25 +24,25 @@ sealed class Field[Doc <: Document[Doc], V](val name: String,
 
   def getJson(doc: Doc): Json = get(doc).json
 
-  override def is(value: V): Filter[Doc] = Filter.Equals(this, value)
+  override def is(value: V): Filter[Doc] = Filter.Equals(name, value)
 
-  override def !==(value: V): Filter[Doc] = Filter.NotEquals(this, value)
+  override def !==(value: V): Filter[Doc] = Filter.NotEquals(name, value)
 
   override protected def rangeLong(from: Option[Long], to: Option[Long]): Filter[Doc] =
-    Filter.RangeLong(this.asInstanceOf[Field[Doc, Long]], from, to)
+    Filter.RangeLong(name, from, to)
 
   override protected def rangeDouble(from: Option[Double], to: Option[Double]): Filter[Doc] =
-    Filter.RangeDouble(this.asInstanceOf[Field[Doc, Double]], from, to)
+    Filter.RangeDouble(name, from, to)
 
   override def IN(values: Seq[V]): Filter[Doc] = {
     Field.MaxIn.foreach { max =>
       if (values.size > max) throw new RuntimeException(s"Attempting to specify ${values.size} values for IN clause in $name, but maximum is ${Field.MaxIn}.")
     }
-    Filter.In(this, values)
+    Filter.In(name, values)
   }
 
   override def parsed(query: String, allowLeadingWildcard: Boolean): Filter[Doc] =
-    Filter.Parsed(this, query, allowLeadingWildcard)
+    Filter.Parsed(name, query, allowLeadingWildcard)
 
   override def words(s: String, matchStartsWith: Boolean, matchEndsWith: Boolean): Filter[Doc] = {
     val words = s.split("\\s+").map { w =>
@@ -62,7 +62,7 @@ sealed class Field[Doc <: Document[Doc], V](val name: String,
   def opt: Field[Doc, Option[V]] = new Field[Doc, Option[V]](name, doc => Option(get(doc)), () => implicitly[RW[Option[V]]], indexed)
 
   override def distance(from: GeoPoint, radius: Distance): Filter[Doc] =
-    Filter.Distance(this.asInstanceOf[Field[Doc, Option[GeoPoint]]], from, radius)
+    Filter.Distance(name, from, radius)
 
   override def toString: String = s"Field(name = $name)"
 }
diff --git a/core/src/main/scala/lightdb/Query.scala b/core/src/main/scala/lightdb/Query.scala
index d46cb5e6..389038c0 100644
--- a/core/src/main/scala/lightdb/Query.scala
+++ b/core/src/main/scala/lightdb/Query.scala
@@ -56,7 +56,7 @@ case class Query[Doc <: Document[Doc], Model <: DocumentModel[Doc]](collection:
                 (implicit transaction: Transaction[Doc]): SearchResults[Doc, V] = {
       val storeMode = collection.store.storeMode
       if (Query.Validation || (Query.WarnFilteringWithoutIndex && storeMode == StoreMode.All)) {
-        val notIndexed = filter.toList.flatMap(_.fields).filter(!_.indexed)
+        val notIndexed = filter.toList.flatMap(_.fields(collection.model)).filter(!_.indexed)
         storeMode match {
           case StoreMode.Indexes => if (notIndexed.nonEmpty) {
             throw NonIndexedFieldException(query, notIndexed)
diff --git a/core/src/main/scala/lightdb/doc/DocumentModel.scala b/core/src/main/scala/lightdb/doc/DocumentModel.scala
index 9fd332fa..a45a50a5 100644
--- a/core/src/main/scala/lightdb/doc/DocumentModel.scala
+++ b/core/src/main/scala/lightdb/doc/DocumentModel.scala
@@ -27,6 +27,11 @@ trait DocumentModel[Doc <: Document[Doc]] {
 
   def fields: List[Field[Doc, _]] = _fields
 
+  def fieldByName[F](name: String): Field[Doc, F] = _fields
+    .find(_.name == name)
+    .getOrElse(throw new NullPointerException(s"$name field not found"))
+    .asInstanceOf[Field[Doc, F]]
+
   lazy val builder: FilterBuilder[Doc, this.type] = new FilterBuilder(this, 1, Nil)
 
   object field {
diff --git a/core/src/main/scala/lightdb/filter/Filter.scala b/core/src/main/scala/lightdb/filter/Filter.scala
index d8a73ed8..222653b7 100644
--- a/core/src/main/scala/lightdb/filter/Filter.scala
+++ b/core/src/main/scala/lightdb/filter/Filter.scala
@@ -2,55 +2,74 @@ package lightdb.filter
 
 import fabric.Json
 import lightdb.Field
-import lightdb.doc.Document
+import lightdb.doc.{Document, DocumentModel}
 import lightdb.spatial.GeoPoint
 
 sealed trait Filter[Doc <: Document[Doc]] {
-  def fields: List[Field[Doc, _]]
+  def fieldNames: List[String]
+
+  def fields(model: DocumentModel[Doc]): List[Field[Doc, _]] =
+    fieldNames.map(model.fieldByName)
 }
 
 object Filter {
   def and[Doc <: Document[Doc]](filters: Filter[Doc]*): Filter[Doc] = filters.tail
     .foldLeft(filters.head)((combined, filter) => combined && filter)
 
-  case class Equals[Doc <: Document[Doc], F](field: Field[Doc, F], value: F) extends Filter[Doc] {
-    def getJson: Json = field.rw.read(value)
+  case class Equals[Doc <: Document[Doc], F](fieldName: String, value: F) extends Filter[Doc] {
+    def getJson(model: DocumentModel[Doc]): Json = model.fieldByName[F](fieldName).rw.read(value)
+    def field(model: DocumentModel[Doc]): Field[Doc, F] = model.fieldByName(fieldName)
 
-    override lazy val fields: List[Field[Doc, _]] = List(field)
+    override lazy val fieldNames: List[String] = List(fieldName)
+  }
+  object Equals {
+    def apply[Doc <: Document[Doc], F](field: Field[Doc, F], value: F): Equals[Doc, F] = Equals(field.name, value)
   }
 
-  case class NotEquals[Doc <: Document[Doc], F](field: Field[Doc, F], value: F) extends Filter[Doc] {
-    def getJson: Json = field.rw.read(value)
+  case class NotEquals[Doc <: Document[Doc], F](fieldName: String, value: F) extends Filter[Doc] {
+    def getJson(model: DocumentModel[Doc]): Json = model.fieldByName[F](fieldName).rw.read(value)
+    def field(model: DocumentModel[Doc]): Field[Doc, F] = model.fieldByName(fieldName)
 
-    override lazy val fields: List[Field[Doc, _]] = List(field)
+    override lazy val fieldNames: List[String] = List(fieldName)
+  }
+  object NotEquals {
+    def apply[Doc <: Document[Doc], F](field: Field[Doc, F], value: F): NotEquals[Doc, F] = NotEquals(field.name, value)
   }
 
-  case class In[Doc <: Document[Doc], F](field: Field[Doc, F], values: Seq[F]) extends Filter[Doc] {
-    def getJson: List[Json] = values.toList.map(field.rw.read)
+  case class In[Doc <: Document[Doc], F](fieldName: String, values: Seq[F]) extends Filter[Doc] {
+    def getJson(model: DocumentModel[Doc]): List[Json] = values.toList.map(model.fieldByName[F](fieldName).rw.read)
+    def field(model: DocumentModel[Doc]): Field[Doc, F] = model.fieldByName(fieldName)
 
-    override lazy val fields: List[Field[Doc, _]] = List(field)
+    override lazy val fieldNames: List[String] = List(fieldName)
+  }
+  object In {
+    def apply[Doc <: Document[Doc], F](field: Field[Doc, F], values: Seq[F]): In[Doc, F] = In(field.name, values)
   }
 
-  case class RangeLong[Doc <: Document[Doc]](field: Field[Doc, Long], from: Option[Long], to: Option[Long]) extends Filter[Doc] {
-    override lazy val fields: List[Field[Doc, _]] = List(field)
+  case class RangeLong[Doc <: Document[Doc]](fieldName: String, from: Option[Long], to: Option[Long]) extends Filter[Doc] {
+    def field(model: DocumentModel[Doc]): Field[Doc, Long] = model.fieldByName(fieldName)
+    override lazy val fieldNames: List[String] = List(fieldName)
   }
 
-  case class RangeDouble[Doc <: Document[Doc]](field: Field[Doc, Double], from: Option[Double], to: Option[Double]) extends Filter[Doc] {
-    override lazy val fields: List[Field[Doc, _]] = List(field)
+  case class RangeDouble[Doc <: Document[Doc]](fieldName: String, from: Option[Double], to: Option[Double]) extends Filter[Doc] {
+    def field(model: DocumentModel[Doc]): Field[Doc, Double] = model.fieldByName(fieldName)
+    override lazy val fieldNames: List[String] = List(fieldName)
   }
 
-  case class Parsed[Doc <: Document[Doc], F](field: Field[Doc, F], query: String, allowLeadingWildcard: Boolean) extends Filter[Doc] {
-    override lazy val fields: List[Field[Doc, _]] = List(field)
+  case class Parsed[Doc <: Document[Doc], F](fieldName: String, query: String, allowLeadingWildcard: Boolean) extends Filter[Doc] {
+    def field(model: DocumentModel[Doc]): Field[Doc, F] = model.fieldByName(fieldName)
+    override lazy val fieldNames: List[String] = List(fieldName)
   }
 
-  case class Distance[Doc <: Document[Doc]](field: Field[Doc, Option[GeoPoint]], from: GeoPoint, radius: lightdb.distance.Distance) extends Filter[Doc] {
-    override lazy val fields: List[Field[Doc, _]] = List(field)
+  case class Distance[Doc <: Document[Doc]](fieldName: String, from: GeoPoint, radius: lightdb.distance.Distance) extends Filter[Doc] {
+    def field(model: DocumentModel[Doc]): Field[Doc, GeoPoint] = model.fieldByName(fieldName)
+    override lazy val fieldNames: List[String] = List(fieldName)
   }
 
   case class Multi[Doc <: Document[Doc]](minShould: Int, filters: List[FilterClause[Doc]] = Nil) extends Filter[Doc] {
     def conditional(filter: Filter[Doc], condition: Condition, boost: Option[Double] = None): Multi[Doc] =
       copy(filters = filters ::: List(FilterClause(filter, condition, boost)))
 
-    override def fields: List[Field[Doc, _]] = filters.flatMap(_.filter.fields)
+    override def fieldNames: List[String] = filters.flatMap(_.filter.fieldNames)
   }
 }
\ No newline at end of file
diff --git a/lucene/src/main/scala/lightdb/lucene/LuceneStore.scala b/lucene/src/main/scala/lightdb/lucene/LuceneStore.scala
index 5bb4d645..8ab77037 100644
--- a/lucene/src/main/scala/lightdb/lucene/LuceneStore.scala
+++ b/lucene/src/main/scala/lightdb/lucene/LuceneStore.scala
@@ -236,29 +236,29 @@ class LuceneStore[Doc <: Document[Doc], Model <: DocumentModel[Doc]](directory:
 
   private def filter2Lucene(filter: Option[Filter[Doc]]): LuceneQuery = filter match {
     case Some(f) => f match {
-      case f: Filter.Equals[Doc, _] => exactQuery(f.field, f.getJson)
+      case f: Filter.Equals[Doc, _] => exactQuery(f.field(collection.model), f.getJson(collection.model))
       case f: Filter.NotEquals[Doc, _] =>
         val b = new BooleanQuery.Builder
         b.add(new MatchAllDocsQuery, BooleanClause.Occur.MUST)
-        b.add(exactQuery(f.field, f.getJson), BooleanClause.Occur.MUST_NOT)
+        b.add(exactQuery(f.field(collection.model), f.getJson(collection.model)), BooleanClause.Occur.MUST_NOT)
         b.build()
       case f: Filter.In[Doc, _] =>
-        val queries = f.getJson.map(json => exactQuery(f.field, json))
+        val queries = f.getJson(collection.model).map(json => exactQuery(f.field(collection.model), json))
         val b = new BooleanQuery.Builder
         b.setMinimumNumberShouldMatch(1)
         queries.foreach { q =>
           b.add(q, BooleanClause.Occur.SHOULD)
         }
         b.build()
-      case Filter.RangeLong(index, from, to) => LongField.newRangeQuery(index.name, from.getOrElse(Long.MinValue), to.getOrElse(Long.MaxValue))
-      case Filter.RangeDouble(index, from, to) => DoubleField.newRangeQuery(index.name, from.getOrElse(Double.MinValue), to.getOrElse(Double.MaxValue))
-      case Filter.Parsed(index, query, allowLeadingWildcard) =>
-        val parser = new QueryParser(index.name, this.index.analyzer)
+      case Filter.RangeLong(fieldName, from, to) => LongField.newRangeQuery(fieldName, from.getOrElse(Long.MinValue), to.getOrElse(Long.MaxValue))
+      case Filter.RangeDouble(fieldName, from, to) => DoubleField.newRangeQuery(fieldName, from.getOrElse(Double.MinValue), to.getOrElse(Double.MaxValue))
+      case Filter.Parsed(fieldName, query, allowLeadingWildcard) =>
+        val parser = new QueryParser(fieldName, this.index.analyzer)
         parser.setAllowLeadingWildcard(allowLeadingWildcard)
         parser.setSplitOnWhitespace(true)
         parser.parse(query)
-      case Filter.Distance(index, from, radius) =>
-        LatLonPoint.newDistanceQuery(index.name, from.latitude, from.longitude, radius.toMeters)
+      case Filter.Distance(fieldName, from, radius) =>
+        LatLonPoint.newDistanceQuery(fieldName, from.latitude, from.longitude, radius.toMeters)
       case Filter.Multi(minShould, clauses) =>
         val b = new BooleanQuery.Builder
         val hasShould = clauses.exists(c => c.condition == Condition.Should || c.condition == Condition.Filter)
diff --git a/sql/src/main/scala/lightdb/sql/SQLStore.scala b/sql/src/main/scala/lightdb/sql/SQLStore.scala
index 0835b885..b00f2468 100644
--- a/sql/src/main/scala/lightdb/sql/SQLStore.scala
+++ b/sql/src/main/scala/lightdb/sql/SQLStore.scala
@@ -481,35 +481,35 @@ abstract class SQLStore[Doc <: Document[Doc], Model <: DocumentModel[Doc]] exten
     throw new UnsupportedOperationException("Distance filtering not supported in SQL!")
 
   private def filter2Part(f: Filter[Doc]): SQLPart = f match {
-    case f: Filter.Equals[Doc, _] if f.field.isArr =>
-      val values = f.getJson.asVector
+    case f: Filter.Equals[Doc, _] if f.field(collection.model).isArr =>
+      val values = f.getJson(collection.model).asVector
       val parts = values.map { json =>
         val jsonString = JsonFormatter.Compact(json)
-        SQLPart(s"${f.field.name} LIKE ?", List(SQLArg.StringArg(s"%$jsonString%")))
+        SQLPart(s"${f.fieldName} LIKE ?", List(SQLArg.StringArg(s"%$jsonString%")))
       }
       SQLPart.merge(parts: _*)
-    case f: Filter.Equals[Doc, _] if f.value == null | f.value == None => SQLPart(s"${f.field.name} IS NULL")
-    case f: Filter.Equals[Doc, _] => SQLPart(s"${f.field.name} = ?", List(SQLArg.FieldArg(f.field, f.value)))
-    case f: Filter.NotEquals[Doc, _] if f.field.isArr =>
-      val values = f.getJson.asVector
+    case f: Filter.Equals[Doc, _] if f.value == null | f.value == None => SQLPart(s"${f.fieldName} IS NULL")
+    case f: Filter.Equals[Doc, _] => SQLPart(s"${f.fieldName} = ?", List(SQLArg.FieldArg(f.field(collection.model), f.value)))
+    case f: Filter.NotEquals[Doc, _] if f.field(collection.model).isArr =>
+      val values = f.getJson(collection.model).asVector
       val parts = values.map { json =>
         val jsonString = JsonFormatter.Compact(json)
-        SQLPart(s"${f.field.name} NOT LIKE ?", List(SQLArg.StringArg(s"%$jsonString%")))
+        SQLPart(s"${f.fieldName} NOT LIKE ?", List(SQLArg.StringArg(s"%$jsonString%")))
       }
       SQLPart.merge(parts: _*)
-    case f: Filter.NotEquals[Doc, _] if f.value == null | f.value == None => SQLPart(s"${f.field.name} IS NOT NULL")
-    case f: Filter.NotEquals[Doc, _] => SQLPart(s"${f.field.name} != ?", List(SQLArg.FieldArg(f.field, f.value)))
-    case f: Filter.In[Doc, _] => SQLPart(s"${f.field.name} IN (${f.values.map(_ => "?").mkString(", ")})", f.values.toList.map(v => SQLArg.FieldArg(f.field, v)))
+    case f: Filter.NotEquals[Doc, _] if f.value == null | f.value == None => SQLPart(s"${f.fieldName} IS NOT NULL")
+    case f: Filter.NotEquals[Doc, _] => SQLPart(s"${f.fieldName} != ?", List(SQLArg.FieldArg(f.field(collection.model), f.value)))
+    case f: Filter.In[Doc, _] => SQLPart(s"${f.fieldName} IN (${f.values.map(_ => "?").mkString(", ")})", f.values.toList.map(v => SQLArg.FieldArg(f.field(collection.model), v)))
     case f: Filter.RangeLong[Doc] => (f.from, f.to) match {
-      case (Some(from), Some(to)) => SQLPart(s"${f.field.name} BETWEEN ? AND ?", List(SQLArg.LongArg(from), SQLArg.LongArg(to)))
-      case (None, Some(to)) => SQLPart(s"${f.field.name} <= ?", List(SQLArg.LongArg(to)))
-      case (Some(from), None) => SQLPart(s"${f.field.name} >= ?", List(SQLArg.LongArg(from)))
+      case (Some(from), Some(to)) => SQLPart(s"${f.fieldName} BETWEEN ? AND ?", List(SQLArg.LongArg(from), SQLArg.LongArg(to)))
+      case (None, Some(to)) => SQLPart(s"${f.fieldName} <= ?", List(SQLArg.LongArg(to)))
+      case (Some(from), None) => SQLPart(s"${f.fieldName} >= ?", List(SQLArg.LongArg(from)))
       case _ => throw new UnsupportedOperationException(s"Invalid: $f")
     }
     case f: Filter.RangeDouble[Doc] => (f.from, f.to) match {
-      case (Some(from), Some(to)) => SQLPart(s"${f.field.name} BETWEEN ? AND ?", List(SQLArg.DoubleArg(from), SQLArg.DoubleArg(to)))
-      case (None, Some(to)) => SQLPart(s"${f.field.name} <= ?", List(SQLArg.DoubleArg(to)))
-      case (Some(from), None) => SQLPart(s"${f.field.name} >= ?", List(SQLArg.DoubleArg(from)))
+      case (Some(from), Some(to)) => SQLPart(s"${f.fieldName} BETWEEN ? AND ?", List(SQLArg.DoubleArg(from), SQLArg.DoubleArg(to)))
+      case (None, Some(to)) => SQLPart(s"${f.fieldName} <= ?", List(SQLArg.DoubleArg(to)))
+      case (Some(from), None) => SQLPart(s"${f.fieldName} >= ?", List(SQLArg.DoubleArg(from)))
       case _ => throw new UnsupportedOperationException(s"Invalid: $f")
     }
     case f: Filter.Parsed[Doc, _] =>
@@ -523,7 +523,7 @@ abstract class SQLStore[Doc <: Document[Doc], Model <: DocumentModel[Doc]] exten
         }
         s
       }.toList
-      SQLPart(parts.map(_ => s"${f.field.name} LIKE ?").mkString(" AND "), parts.map(s => SQLArg.StringArg(s)))
+      SQLPart(parts.map(_ => s"${f.fieldName} LIKE ?").mkString(" AND "), parts.map(s => SQLArg.StringArg(s)))
     case f: Filter.Distance[Doc] => distanceFilter(f)
     case f: Filter.Multi[Doc] =>
       val (shoulds, others) = f.filters.partition(f => f.condition == Condition.Filter || f.condition == Condition.Should)
diff --git a/sqlite/src/main/scala/lightdb/sql/SQLiteStore.scala b/sqlite/src/main/scala/lightdb/sql/SQLiteStore.scala
index c84daad5..623d3250 100644
--- a/sqlite/src/main/scala/lightdb/sql/SQLiteStore.scala
+++ b/sqlite/src/main/scala/lightdb/sql/SQLiteStore.scala
@@ -96,7 +96,7 @@ class SQLiteStore[Doc <: Document[Doc], Model <: DocumentModel[Doc]](val connect
   }
 
   override protected def distanceFilter(f: Filter.Distance[Doc]): SQLPart =
-    SQLPart(s"ST_Distance(${f.field.name}, GeomFromText(?, 4326), true) <= ?", List(SQLArg.GeoPointArg(f.from), SQLArg.DoubleArg(f.radius.m)))
+    SQLPart(s"ST_Distance(${f.fieldName}, GeomFromText(?, 4326), true) <= ?", List(SQLArg.GeoPointArg(f.from), SQLArg.DoubleArg(f.radius.m)))
 
   override protected def addColumn(field: Field[Doc, _])(implicit transaction: Transaction[Doc]): Unit = {
     if (field.rw.definition.className.contains("lightdb.spatial.GeoPoint")) {