[Rails carrier wave] How to not transition to the error screen even if the image upload is not selected
Solutions
Allow params to be nil by using fetch method instead of require.
private
def food_record_params
params.fetch(:food_record, {}).permit(:image)
end
Technology used
Implemented image upload function using carrierwave.
gem 'carrierwave'
How to use carrierwave https://qiita.com/uchida0331/items/f99aba46fd1a6df9e753
problem
On the image upload screen, if you press the registration button while the image is not selected, an event that transitions to the error screen occurs.
Cause
As shown in the error log, if the parameter does not contain a value in the require method, an error will occur. This is because require is a method for throwing an exception when params does not contain a value.
Reference material
ruby2.7 reference https://docs.ruby-lang.org/ja/latest/method/Hash/i/fetch.html