[SOLVED] Rails: Cannot create new documents with MongoMapper

Rails: Cannot create new documents with MongoMapper

I have been using MongoMapper with Rails 5.2. Creating model:

class Item
    include MongoMapper::Document
    key :title, String
    key :description, String
end

In the MongoDB, I inserted the document

{
    "title": "demo",
    "description": "this is the demo item"
}

Using Rails console to test this model

Item.where({:title => "demo"}).first

It shows the result is the document above. But when I create a new document with:

item = Item.create({:title => "demo2", :description => "the demo2"})

An error in the console

Traceback (most recent call last):
    2: from (irb):3
    1: from (eval):9:in `title='
NoMethodError (undefined method `[]' for nil:NilClass)

I tried with the method new

item = Item.new

The console shows:

Traceback (most recent call last):
    2: from (irb):4
    1: from (irb):4:in `new'
NoMethodError (undefined method `keys' for nil:NilClass)

Please help!

Solution

Mongomapper is not compatible with rails 5.2