• Nomethoderror Undefined Method Generate_key For Nil Nilclass 2
• Nomethoderror Undefined Method Generate_key For Nil Nilclass Money
• Undefined Method For Nil Class

• Undefined method `' for nil:NilClass (NoMethodError) ということなので、 nil に対して、定義されていないメソッド を使用してしまったということです。 がいくつも登場していますので、ここでは、.
• Nilに対してを使ってアクセスしようとしたら出るerrorですね。 nil0 NoMethodError: undefined method `' for nil:NilClass 8～11行までにを使っていじろうとしていますが、そのうちのどれかで変数がnilのままいじろうとして怒られてます。.

If your error looks like ..

note.html.erb で、note.userがnilになってしまうと、そこでメソッドを呼びだそうとしても存在しないので、NoMethodErrorとなってしまいます。 imagefor 側で、 nil が来てもエラーにせずにちゃんと抜けられるようにすることと、 note.user が本当に nil になっていいのか.

.. this means that you're calling a method on an object that has not been defined properly.

Step 1: Check return value of method you're is what you expect

Check to see what the return value of the method you're calling is. Is the return value the object you expect? You may need to handle a situation where you receive an false or nil value back.

For example, here we're searching for a contact by an id number that does not exist:

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The error:

We expected contact to be defined, but as the contact wasn't found, we couldn't call the method full_name on it.

To fix this error, we could adjust our program like so:

Step 2: Define instance variables before using them

Unlike local variables, which when undefined, raise an undefined local variable error, instance variables start out as a NilClass, and you won't receive a helpful undefined variable style message. Instead, you'll only learn about the issue when you try to call a method on them.

For example, here we're trying to determine someones age by the current year and the year they were born:

Our error:

Nomethoderror Undefined Method Generate_key For Nil Nilclass 2

@current_year was never defined, and as @current_year begins with an @, it is treated as an instance variable. Ruby was expecting that NilClass had a method called - (the subtraction symbol). In other words, the ruby interpreter expected this:

Of course, we wouldn't add a method like this to NilClass in this way.

Nomethoderror Undefined Method Generate_key For Nil Nilclass Money

Undefined Method For Nil Class

What we need to do is define @current_year first: