タグactiverecord - これはページ10です - GeneraCodice

I have a mistakes: undefined method `name' for nil:NilClass and undefined method `id' for nil:NilClass

https://www.generacodice.com/jp/articolo/13530961/i-have-a-mistakes-undefined-method-name-for-nil-nilclass-and-undefined-method-id-for-nil-nilclass
  ruby  -  ruby-on-rails  -  activerecord  -  ruby-on-rails-4
StackOverflow StackOverflow

user model error - Rails

https://www.generacodice.com/jp/articolo/13529275/user-model-error-rails
  ruby-on-rails  -  activerecord  -  devise  -  pundit
StackOverflow StackOverflow

Rails: Most efficient way to check if a new record already exists in DB

https://www.generacodice.com/jp/articolo/13528846/rails-most-efficient-way-to-check-if-a-new-record-already-exists-in-db
  ruby-on-rails  -  activerecord  -  ruby-on-rails-4
StackOverflow StackOverflow

nil value reaching ActiveRecord validation despite correct value passed to constructor

https://www.generacodice.com/jp/articolo/13527370/nil-value-reaching-activerecord-validation-despite-correct-value-passed-to-constructor
  ruby  -  validation  -  activerecord  -  ruby-on-rails-4
StackOverflow StackOverflow

removing the brackets and quotes from active record

https://www.generacodice.com/jp/articolo/13526854/removing-the-brackets-and-quotes-from-active-record
  ruby  -  ruby-on-rails  -  activerecord
StackOverflow StackOverflow

rails activerecord concern, including url helpers

https://www.generacodice.com/jp/articolo/13516489/rails-activerecord-concern-including-url-helpers
  ruby-on-rails  -  activerecord
StackOverflow StackOverflow

Multiple where clauses on the same column with a many to many relationship

https://www.generacodice.com/jp/articolo/13510528/multiple-where-clauses-on-the-same-column-with-a-many-to-many-relationship
  sql  -  ruby-on-rails  -  activerecord  -  arel
StackOverflow StackOverflow

load data in form_tag without refreshing page in rails 4

https://www.generacodice.com/jp/articolo/13508611/load-data-in-form-tag-without-refreshing-page-in-rails-4
  ruby-on-rails  -  activerecord
StackOverflow StackOverflow

How do I associate these two objects correctly?

https://www.generacodice.com/jp/articolo/13507225/how-do-i-associate-these-two-objects-correctly
  ruby-on-rails  -  activerecord  -  associations
StackOverflow StackOverflow

500 Internal Server error on find_or_create_by()

https://www.generacodice.com/jp/articolo/13499254/500-internal-server-error-on-find-or-create-by
  ruby-on-rails  -  activerecord  -  ruby-on-rails-4
StackOverflow StackOverflow
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