has_many :through Association in Rails

[@ChandanKumar-h4b]

Superb content buddy! Really appreciate your hard work 🙌

[@usamaislam1419]

excellent work brother

[@codenet1]

How do one access the students project submission date

[@MyOpinion_MyReview]

Can you explain build method

[@geekysunny01]

indian guy

[@vigneshwarsathyanarayanan]

When I try creating a StudentProject
the transaction gets rolled back
not sure why
StudentProject.create(student_id: 10, project_id: 10, submission_date: Date.today + 30.days)
TRANSACTION (0.1ms) begin transaction
Student Load (0.1ms) SELECT "students".* FROM "students" WHERE "students"."id" = ? LIMIT ? [["id", 10], ["LIMIT", 1]]
Project Load (0.0ms) SELECT "projects".* FROM "projects" WHERE "projects"."id" = ? LIMIT ? [["id", 10], ["LIMIT", 1]]
TRANSACTION (0.0ms) rollback transaction

[@APPSIMPACTAcademy]

Can you please try this way?
student_project = StudentProject.new(student_id: 10, project_id: 10, submission_date: Date.today + 30.days)
student_project.valid?
If this returns false, then please try to see the errors by running:
student_project.errors.full_messages

[@APPSIMPACTAcademy]

let me know if this works for you

[@vigneshwarsathyanarayanan]

@@APPSIMPACTAcademy i am getting this
irb(main):022:0> student_project.errors.full_messages
=> ["Project must exist"]

[@APPSIMPACTAcademy]

@@vigneshwarsathyanarayanan you need to check if the project model has some instances or not

[@vigneshwarsathyanarayanan]

@@APPSIMPACTAcademy i followed the lecture and in the project model there are only associations present
class Project < ApplicationRecord
has_many :student_projects
has_many :students, through: :student_projects
end