Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

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    1. This table or related slice is empty.
    1. PORuby on Rails: how to get error messages from a child resource displayed?
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    1. PTAnswer
    1. This table or related slice is empty.
    1. USFred
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    1. VO
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      1. This table or related slice is empty.
      1. VTDownMod
    2. VO
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      1. VTUpMod
    1. COIt gets linked and stored into the database as it should. I'm intentionally failing validation by passing a bad email as the problem originally suggests. If I pass a proper email that passes the regex, then I don't get an error. The point here is to *intentionally* fail, and get the appropriate message into the view.
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      1. USrandombits
    2. COI understand you are deliberately failing the example. I don't think you understand my point. Why have you made the add_student method a class method? In Ruby, self points to the class object in class methods, so the message add_student, while being sent to the instance object, executes with self pointing to the class object rather than the instance object. Perhaps ActiveRecord manages to do the right thing despite this, but unless I'm missing something, the method should not be a class method. I would be grateful if you could tell me what I'm missing.
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      1. USFred
    3. COOK, I understand now. The add_student method cannot be a class method; that was a typo in your example. If you send a class method message to an instance object, you get NoMethodError. Rails doesn't recover from calling a class method on an instance object, at least in this case. The code you gave produces a NoMethodError in SchoolsController#create when I tried it out. Ruby instance objects do not see class methods because class methods are singleton methods for the class object. That's what I didn't understand, and now I do. Learn a thing a day, drive ignorance away!
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

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