Undefined Method Raise_In_Transactional_Callbacks=' for Activerecord::Base:Class (Nomethoderror)

Undefined method raise_in_transactional_callbacks=' for ActiveRecord::Base:Class (NoMethodError)

Your config/application.rb has the following line:

config.active_record.raise_in_transactional_callbacks = true

This is not a valid configuration value in your version of Rails. You will need to delete it or comment it out to continue.

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Note: this error and the one that preceded it are indicative of an incomplete Rails version change. If you are in the early stages of a tutorial, you might seriously consider restarting your application using your preferred version of Rails from the very start. This will help you avoid this type of error until you are more familiar with the technology.

undefined method `raise_in_transactional_callbacks=' for # Class:0x0000000460c328 when connecting to localhost

Go to your config/application.rb and comment the line:

config.active_record.raise_in_transactional_callbacks = true

Please help, undefined method `raise_in_transactional_callbacks=' for # Class:0x007fc3b02ed058

Remove this line:

config.active_record.raise_in_transactional_callbacks = true

from application.rb.

source

Can't create a new Spree app: undefined method `raise_in_transactional_callbacks='

The problem: I'd created a new rails app with rails new, which had automatically created an app using rails 4.2.0beta. Then I had issues with gem incompatibilities, so I'd changed the version number of a few gems, including downgrading Rails back to 4.1.8.

BUT the config setting raise_in_transactional_callbacks is new in Rails 4.2.0, so in earlier versions of Rails it will raise an error. If you're getting this error message you need to remove the line config.active_record.raise_in_transactional_callbacks = true from config/application.rb.

NoMethodError: undefined method `type' for # Class

Change type to type_name as type can be only use for STI.

validates :name, :type, presence: true

to

validates :name, :type_name, presence: true

Rails undefined method `[]' for nil:NilClass

Try this

def initialize
  super
  @session_types = Array.new
  @program_id = ''
end

You were very scarce with pasting your errors, but that's the first thing that comes to mind. Please post the entire error if this doesn't help.

The reason for that is your Setting class inherits from ActiveRecord::Base, calling super first calls parent's initialize method, this way you add functionality to the method (extend it). Without super you override it, meaning you replace everything it does by default (like for example connecting to the database, validating) by your code.

ActiveRecord::RecordInvalid: Validation failed: Left side must exist

Problem solved in this issue.

As @pixeltrix stated:

Hmm, looks like the one of the belongs_to associations on the
constructed join model isn't pointing to the right column so is seen
as nil. Previously this wasn't a problem but since we require
belongs_to associations by default now it blows up. The easy fix is
just to put optional: true on the :left_side association when it's
constructed but I think we can do better than that /p>

NoMethodError undefined method 'each' for :String

You defined events(association) and you tried to assing string on events it raise error.

You can not assign string to association. if you create events string column on user model. you should change events column name or change events association(has_many) name. This makes conflict.

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