Rails MongoDb has_many and embeds_many - ruby-on-rails

Question

I have the following table structure for example - Users, Projects.
Users has_many Projects
Projects has_many Photos
But i want to embedded certain basic content of Projects and Photos into the Users Table so that i can reduce the number of database calls for certain pages.
Below is the structure i have come up with.
Users Table
[
{
"id": "LONG-MONGO-ID-HERE-USER-1",
"name": "Harsha MV",
"email": "harsha#mink7.com",
"gender": "male",
"telephone": "9986377561",
"is_pro": 1,
"projects": [
{
"id": "LONG-MONGO-ID-HERE-PROJECT-1",
"name": "Nike",
"url": "http://nike.com",
"logo": "logo_nike.jpg",
"photos": [
{
"title": "Some title for an Image",
"file": "project1_photo1.jpg"
},
{
"title": "another title for an Image",
"file": "project1_photo2.jpg"
}
]
},
{
"id": "LONG-MONGO-ID-HERE-PROJECT-2",
"name": "BMW",
"url": "http://bmw.com",
"logo": "logo_bmw.jpg",
"photos": [
{
"title": "Some title for an Image",
"file": "project2_photo1.jpg"
},
{
"title": "another title for an Image",
"file": "project2_photo2.jpg"
}
]
}
]
},
{
"id": "LONG-MONGO-ID-HERE-USER-2",
"name": "Pruthvi Gowda",
"email": "pruthvi#mink7.com",
"gender": "male",
"telephone": "9982318016",
"is_pro": 0,
"projects": [
{
"id": "LONG-MONGO-ID-HERE-PROJECT-3",
"name": "Adidas",
"url": "http://adidas.com",
"logo": "logo_adidas.jpg",
"photos": [
{
"title": "Some title for an Image",
"file": "project1_photo3.jpg"
},
{
"title": "another title for an Image",
"file": "project1_photo4.jpg"
}
]
},
{
"id": "LONG-MONGO-ID-HERE-PROJECT-2",
"name": "BMW",
"url": "http://bmw.com",
"logo": "logo_bmw.jpg",
"photos": [
{
"title": "Some title for an Image",
"file": "project2_photo1.jpg"
},
{
"title": "another title for an Image",
"file": "project2_photo2.jpg"
}
]
}
]
}
]
Projects Table
[
{
"id": "LONG-MONGO-ID-HERE-PROJECT-1",
"name": "Nike",
"url": "http://nike.com",
"logo": "logo_nike.jpg",
"about": "Lorem Ipsum is simply dummy text of the printing and typesetting industry.",
"testimonial": "e middle of text. All the Lorem Ipsum generators on the Internet tend",
"photos": [
{
"title": "Some title for an Image",
"description": "um is simply dummy text of the printing and t",
"file": "project1_photo1.jpg"
},
{
"title": "another title for an Image",
"description": "text of the printing and t um is simply dummy",
"file": "project1_photo2.jpg"
}
],
"user": {
"id": "LONG-MONGO-ID-HERE-USER-1",
"name": "Harsha MV",
"email": "harsha#mink7.com"
}
},
{
"id": "LONG-MONGO-ID-HERE-PROJECT-2",
"name": "BMW",
"url": "http://bmw.com",
"logo": "logo_bmw.jpg",
"about": "It is a long established fact that a reader will be distracted by the",
"testimonial": "from sections 1.10.32 and 1.10.33 of de Finibus Bonorum et Malorum",
"photos": [
{
"title": "Some title for an Image",
"description": "um is simply dummy text of the printing and t",
"file": "project2_photo1.jpg"
},
{
"title": "another title for an Image",
"description": "text of the printing and t um is simply dummy",
"file": "project2_photo2.jpg"
}
],
"user": {
"id": "LONG-MONGO-ID-HERE-USER-1",
"name": "Harsha MV",
"email": "harsha#mink7.com"
}
}
]
As I have understood MongoDb is all about replication of data. is this the right way of designing the database structure.
class User
include Mongoid::Document
field :first_name, type: String
field :last_name, type: String
field :company_name, type: String
embeds_many :projects, class_name: "Project"
has_many :projects, class_name: "Project"
end
Can i do something like the above so that i can save two instance of the same data.
But as you see in the embedded document i am not storing all the data from the projects - how can i strict it from adding all the data as embedded document but stored as a separate table?

Answer 1

It is not possible to add same model as both embedded and referenced collection. You can put the structure as same you have mentioned initially by referencing the project collection in user.
And create dummy model say ImportantProject which will be embedded in User and you can sync up the data project in this model while making changes in database.