diff --git a/src/widgets/field/BooleanField.js b/src/widgets/field/BooleanField.js
index b9cd516..50cc75a 100644
--- a/src/widgets/field/BooleanField.js
+++ b/src/widgets/field/BooleanField.js
@@ -31,7 +31,7 @@ BooleanField.propTypes = {
     label: PropTypes.string,
     record: PropTypes.object,
     source: PropTypes.string.isRequired,
-    convert: PropTypes.func.isRequired,
+    convert: PropTypes.oneOfType([PropTypes.func,PropTypes.object]),
 };
 
 BooleanField.defaultProps = {
diff --git a/src/widgets/field/EmailField.js b/src/widgets/field/EmailField.js
index 95d70a2..6393fff 100644
--- a/src/widgets/field/EmailField.js
+++ b/src/widgets/field/EmailField.js
@@ -17,7 +17,7 @@ EmailField.propTypes = {
     label: PropTypes.string,
     record: PropTypes.object,
     source: PropTypes.string.isRequired,
-    convert: PropTypes.func.isRequired
+    convert: PropTypes.oneOfType([PropTypes.func,PropTypes.object])
 };
 
 EmailField.defaultProps = {
diff --git a/src/widgets/field/NumberField.js b/src/widgets/field/NumberField.js
index 7eecd9e..a98eeb8 100644
--- a/src/widgets/field/NumberField.js
+++ b/src/widgets/field/NumberField.js
@@ -56,7 +56,7 @@ NumberField.propTypes = {
     options: PropTypes.object,
     record: PropTypes.object,
     source: PropTypes.string.isRequired,
-    convert: PropTypes.func.isRequired,
+    convert: PropTypes.oneOfType([PropTypes.func,PropTypes.object]),
 };
 
 NumberField.defaultProps = {
diff --git a/src/widgets/field/RichTextField.js b/src/widgets/field/RichTextField.js
index 511e67b..3eec99f 100644
--- a/src/widgets/field/RichTextField.js
+++ b/src/widgets/field/RichTextField.js
@@ -25,15 +25,15 @@ RichTextField.propTypes = {
     record: PropTypes.object,
     source: PropTypes.string.isRequired,
     stripTags: PropTypes.bool,
-    convert: PropTypes.func.isRequired
+    convert: PropTypes.oneOfType([PropTypes.func,PropTypes.object])
 };
 
 RichTextField.defaultProps = {
     addLabel: true,
     stripTags: false,
-    convert: function (value) {
-        return value
-    }
+    // convert: function (value) {
+    //     return value
+    // }
 };
 
 export default RichTextField;
diff --git a/src/widgets/field/TextField.js b/src/widgets/field/TextField.js
index a95dcf8..a21c139 100644
--- a/src/widgets/field/TextField.js
+++ b/src/widgets/field/TextField.js
@@ -25,7 +25,7 @@ TextField.propTypes = {
     label: PropTypes.string,
     record: PropTypes.object,
     source: PropTypes.string.isRequired,
-    convert: PropTypes.oneOf([PropTypes.func,PropTypes.object])
+    convert: PropTypes.oneOfType([PropTypes.func,PropTypes.object])
 };
 
 TextField.defaultProps = {