In rails, how can I find out what caused a .save() to fail, other than validation errors?

In rails, how can I find out what caused a .save() to fail, other than validation errors?

---

I have an ActiveRecord model which is returning true from valid? (and .errors is empty), but is returning false from save(). If the model instance is valid, how can I find out what's causing the save to fail?

---

Check all your callbacks.

I had a problem like this where I had and "after_validate" method that was failing after I had made a bunch of changes to the model. The model was valid but the "after_validate" was returning false, so if I used model.valid it said true, but then if I saved it gave me validation errors (passed through from the after_validate callback). It was weird.

Look at the application trace and you should be able to see what line of code is raising the exception.

---

Try using the bang version save! (with an exclamation mark at the end) and inspecting the resulting error.

---

If @user.save (for example) returns false, then just run this to get all the errors:

@user.errors.full_messages

---

Yea, I fixed this issue by making sure I return true in all my before_* callbacks then it starts working :)

---

The problem I had was that I had forgotten to add the validation to the model.

class ContactGroup < ActiveRecord::Base
  validates_presence_of :name
end

참고URL : https://stackoverflow.com/questions/4714001/in-rails-how-can-i-find-out-what-caused-a-save-to-fail-other-than-validatio