hasManyToMany

class Recipes extends Entities
{
    public function initialize() {
        parent::initialize();

        $this->hasManyToMany(
            'id',
            'PhalconRest\Models\Entities\RecipeIngredients',
            'idRecipe', 'idIngredient',
            'PhalconRest\Models\Entities\Ingredients',
            'id',
            array('alias' => 'recipeIngredients')
        );
        ....
    }
   ....
}
[columns]
recipe => id,recipe,..
ingredients => id,ingredients,origin,..
recipeIngredients => id,idRecipe,idIngredient,measure,cookingSecret,isDelivery
[create point]

        $oRecipe = new EntityRecipes();
        ....
        foreach( $data->ingredients as $ingredient)
        {
            $oRecipeIngredient = new EntityRecipeIngredients();

            $oRecipeIngredient->assign( (array)$ingredient);

            $aRecipeIngredients[] = $oRecipeIngredient;
        }
        ....
        return $oRecipe->create();
[posting data]
....
"ingredients":
        [{
            "idIngredient":135,
            "measure":"",
            "cookingSecret":false,
            "isDelivery":true
        }],
....

[error]

1 [internal function]: Phalcon\Mvc\Model->fireEvent('onValidationFai...')

2 [internal function]: Phalcon\Mvc\Model->preSave(Object(Phalcon\Mvc\Model\MetaData\Memory), false, 'idrecipeingred...')

3 [internal function]: Phalcon\Mvc\Model->save()

4 [internal function]: Phalcon\Mvc\Model->_postSaveRelatedRecords(Object(Phalcon\Db\Adapter\Pdo\Mysql), Array)

5 [internal function]: Phalcon\Mvc\Model->save(NULL, NULL)

6 /library/webserver/api/models/Repositories/Repository/Recipes.php(217): Phalcon\Mvc\Model->create()

7 /library/webserver/api/controllers/RecipesController.php(33): PhalconRest\Models\Repositories\Repository\Recipes->Add(Object(stdClass))

8 [internal function]: PhalconRest\Controllers\RecipesController->UploadRecipe()

9 [internal function]: Phalcon\Mvc\Micro\LazyLoader->__call('UploadRecipe', Array)

10 [internal function]: Phalcon\Mvc\Micro\LazyLoader->UploadRecipe()

11 /library/webserver/api/index.php(199): Phalcon\Mvc\Micro->handle()

12 /library/webserver/api/index.php(204): App->main()

13 {main}

```

"idRecipe": "Value of field idRecipe must be numeric"

i got this error msg. Is it wrong to use?

It looks like idRecipe is the primary key but it has a wrong value assigned. Check that the value assigned of 'idRecipe' to be an integer, this is why you're getting this error.