Write a join query with multiple tables in ruby on rails - sql

Question

I have Downloaded Document model which contains data regarding the user downloaded documents , the schema of downloaded_documents table is
id document_id document_type user_id
1 444 article 1
2 120 judgment 2
3 444 article 1
4 555 rule 3
5 555 rule 4
Now I want to generate report for all the downloaded documents and it users. And there is no relationship between the downloaded documents and user model, and each document_type in nothing but the each model in our application, so I want a document information also user information also. So How I write a query ?
I have written the following query:
DownloadedDocument.joins("JOIN users ON downloaded_documents.user_id = users.id").select("distinct on (downloaded_documents.document_id, downloaded_documents.user_id, downloaded_documents.document_type) users.email, document_type.created_at").where('created_at >=? and created_at <= ?',Date.parse(from_date), Date.parse(to_date))
But I am not getting the document information. I should add a one more JOIN in the above query which is nothing but JOIN on ------downloaded_documents.document_id = -----.id in the ---- place I need to add document type name, but for ALL I want all models mentioned in the document_type, so how could I write query?
My Article model schema
ID title
444 first title
Judgment schema
ID appellant_name respondent_name case_no
120 ddd gggg abc.123
Rule schema
ID rule_name
555 example
I want a output something like this:
{'judgment' => [{case_no: 'abc.123',email: 'abc.example.com', dcoument_id: 120}], 'article' => [{title: 'first title', email: 'ads#example.com', document_id: 444},{title: 'first_title', email: 'fff#example.com', document_id: 444}]}
I want to generate a report for to list document and its users