[RUBY] Convert the array of errors.full_messages to characters and output

Problems that have occurred and what you want to do

Since errors.full_messages is an array, the flash message is output as ["hoge hoge"] → I want to change it to characters and output hogehoge

What i did

Just add the to_sentence method to errors.full_messages


class Users::UserController < Users::ApplicationController

def update
 @user = user.Users
flash[:alert] = @user.errors.full_messages.to_sentence


Thank you for your hard work today.

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