diff --git a/packages/datasource-customizer/src/collection-customizer.ts b/packages/datasource-customizer/src/collection-customizer.ts
index 6a900b365..c55753d8a 100644
--- a/packages/datasource-customizer/src/collection-customizer.ts
+++ b/packages/datasource-customizer/src/collection-customizer.ts
@@ -1,6 +1,7 @@
 import {
   CollectionSchema,
   CollectionUtils,
+  ColumnSchema,
   Logger,
   Operator,
   SchemaUtils,
@@ -46,7 +47,7 @@ export default class CollectionCustomizer<
   readonly name: string;
 
   get schema(): CollectionSchema {
-    return this.stack.validation.getCollection(this.name).schema;
+    return this.stack.binary.getCollection(this.name).schema;
   }
 
   constructor(
@@ -646,6 +647,28 @@ export default class CollectionCustomizer<
     });
   }
 
+  /**
+   * Mark a field as optional
+   *
+   * Be wary that your database might still refuse empty values if it requires one
+   * @param name the name of the column you would like optional
+   * @example
+   * .setFieldNullable('userName');
+   */
+  setFieldNullable(name: TColumnName<S, N>): this {
+    return this.pushCustomization(async () => {
+      const column = this.schema.fields[name];
+
+      if (column && column?.type === 'Column') {
+        (column as ColumnSchema).allowNull = true;
+
+        column.validation = column.validation?.filter(
+          validation => validation.operator !== 'Present',
+        );
+      }
+    });
+  }
+
   private pushRelation(name: string, definition: RelationDefinition): this {
     return this.pushCustomization(async () => {
       this.stack.relation.getCollection(this.name).addRelation(name, definition);
diff --git a/packages/datasource-customizer/src/datasource-customizer.ts b/packages/datasource-customizer/src/datasource-customizer.ts
index 65217f88e..23d66e191 100644
--- a/packages/datasource-customizer/src/datasource-customizer.ts
+++ b/packages/datasource-customizer/src/datasource-customizer.ts
@@ -40,16 +40,14 @@ export default class DataSourceCustomizer<S extends TSchema = TSchema> {
    * Retrieve schema of the agent
    */
   get schema(): DataSourceSchema {
-    return this.stack.validation.schema;
+    return this.stack.binary.schema;
   }
 
   /**
    * Get list of customizable collections
    */
   get collections(): CollectionCustomizer<S>[] {
-    return this.stack.validation.collections.map(c =>
-      this.getCollection(c.name as TCollectionName<S>),
-    );
+    return this.stack.binary.collections.map(c => this.getCollection(c.name as TCollectionName<S>));
   }
 
   constructor(options?: Options) {
diff --git a/packages/datasource-customizer/test/collection-customizer.test.ts b/packages/datasource-customizer/test/collection-customizer.test.ts
index 5cf16ca95..92f6f6320 100644
--- a/packages/datasource-customizer/test/collection-customizer.test.ts
+++ b/packages/datasource-customizer/test/collection-customizer.test.ts
@@ -87,6 +87,12 @@ describe('Builder > Collection', () => {
               filterOperators: new Set(['Equal', 'In']),
             }),
             title: factories.columnSchema.build({ columnType: 'String' }),
+            numberOfPages: factories.columnSchema.build({ columnType: 'Number', allowNull: false }),
+            numberOfCoWriter: factories.columnSchema.build({
+              columnType: 'Number',
+              allowNull: false,
+              validation: [{ operator: 'Present' }, { operator: 'LessThan', value: '3' }],
+            }),
           },
         }),
       }),
@@ -98,8 +104,9 @@ describe('Builder > Collection', () => {
     // @ts-ignore
     const { stack } = dsc;
     const customizer = new CollectionCustomizer(dsc, stack, 'authors');
+    const bookCustomizer = new CollectionCustomizer(dsc, stack, 'books');
 
-    return { dsc, customizer, stack };
+    return { dsc, customizer, stack, bookCustomizer };
   };
 
   describe('use', () => {
@@ -873,4 +880,42 @@ describe('Builder > Collection', () => {
       expect(self).toEqual(customizer);
     });
   });
+
+  describe('setFieldNullable', () => {
+    describe('when the field is already optional', () => {
+      it('should not change anything', async () => {
+        const { dsc, bookCustomizer } = await setup();
+
+        const self = bookCustomizer.setFieldNullable('title');
+        await dsc.getDataSource(logger);
+
+        expect((self.schema.fields.title as ColumnSchema).allowNull).toStrictEqual(true);
+      });
+    });
+
+    describe('when the field is not optional', () => {
+      it('should make it optional', async () => {
+        const { dsc, bookCustomizer } = await setup();
+
+        const self = bookCustomizer.setFieldNullable('numberOfPages');
+        await dsc.getDataSource(logger);
+
+        expect((self.schema.fields.numberOfPages as ColumnSchema).allowNull).toStrictEqual(true);
+      });
+
+      describe('when the field also include `Present` validation', () => {
+        it('should make it optional and remove validation', async () => {
+          const { dsc, bookCustomizer } = await setup();
+
+          const self = bookCustomizer.setFieldNullable('numberOfCoWriter');
+          await dsc.getDataSource(logger);
+
+          const column = self.schema.fields.numberOfCoWriter as ColumnSchema;
+          expect(column.allowNull).toStrictEqual(true);
+          expect(column.validation).toHaveLength(1);
+          expect(column.validation[0].operator).toBe('LessThan');
+        });
+      });
+    });
+  });
 });