ruby-on-rails-5

问题 I want to test something. If false do this. I wish not to test for true, only false. My code looks like this and I only need to do something if false: if Model.exists?(table_column: 'joe') # this part is blank else # run this code end My code runs after the else which is what I want. Is there a clean rails/ruby method that tests for false? My code would only run if false, not true. If duplicate, I'll gladly delete. Thanks 回答1: Use unless unless Model.exists?(table_column: 'joe') # run code

问题 I have a Rails 5 app with the Devise gem installed. My project is set up in such a way, that all controllers are namespaced...Even Devise controllers. In my routes file I have done this(This will better explain my namespacing structure): controllers: { sessions: "api/v1/public/members/users/sessions", passwords: "api/v1/public/members/users/passwords", registrations: "api/v1/public/members/users/registrations", }, path_names: { sign_in: 'login', password: 'forgot', sign_up: 'register', sign

问题 I am trying to get this spec to pass: it "queues up AbsenteeReservationEmailerJob" do ActiveJob::Base.queue_adapter = :test expect { subject }.to enqueue_job(AbsenteeReservationEmailerJob) end My factory looks like so: FactoryBot.define do factory :absentee_reservation do amount_cents { 10_000 + rand(1_000_000) } creator { create(:user) } before(:create) do |absentee_reservation| auction = create(:auction_with_one_item_one_bidder) item = auction.items.first absentee_reservation.auction =

问题 I'm trying to install ruby on rails with rails installer. When I use "rails new blog" to get my feet wet on starting the web page, I keep getting a build error to build a native extension. I've also have similar problems installing sqlite3. The same issues appear on my laptop as well. (Both windows) So far I tried downloading this walkthrough (https://github.com/Shopify/bootsnap/issues/134), but get stuck when it tells me to do the script. I tried running the given script in irb as it said to

问题 Here is the file, containing what should receive from the Message Relay Job that successfully loads on the server. App.chatrooms = App.cable.subscriptions.create "ChatroomsChannel", connected: -> # Called when the subscription is ready for use on the server disconnected: -> # Called when the subscription has been terminated by the server received: (data) -> console.log(data) active_chatroom = $("[data-behavior='messages'][data-chatroom-id='#{data.chatroom_id}']").append("<div><strong>#{data

问题 I am using Shrine Gem for image uploads and was wondering how, if possible, can I show a 1st page preview in my template like showing an image per-say. I am ok with using jQuery or other library. Below is my code for the file upload, including my Shrine initializer and uploader file. view ... <div class="col-md-4 upload-block"> <%= f.label :spec_sheet, 'Spec Sheet' %> <% if @product.spec_sheet.present? %> <div class="product-image"> <%= image_tag(@product.spec_sheet_url(:thumb)) %> <div class

问题 We have code that is effectively doing this. obj.things.each |thing| ... do some stuff ... obj.things.destroy(thing) ... do some more stuff... end We found out that simultaneously iterating over a CollectionProxy while changing the CollectionProxy results in only half the items being iterated over. Currently we're working around this by flattening the proxy into an array. But this means copying all the things into memory. obj.things.to_a.each |thing| ... end Is there a way to iterate and

问题 I am using the following Gems: 'paperclip' 'aws-sdk', '~> 2.3' I would like to save images to S3, but am unable to get them to save. model/user.rb class User < ApplicationRecord # This method associates the attribute ":avatar" with a file attachment has_attached_file :avatar, styles: { thumb: '100x100>', square: '200x200#', medium: '300x300>' } # Validate the attached image is image/jpg, image/png, etc validates_attachment_content_type :avatar, :content_type => /\Aimage\/.*\Z/ end migration

问题 As I understand it any js file in the assets/javascripts folder is loaded if /= require_tree is present in the application.js file. I can't get my JS code to work, however. I have put it in assets/javascripts/locations.js and it doesn't work. When I put it in a script tag in my application.html.erb file it worked perfectly on the other hand. Any ideas what I could be missing? Running Rails 5.2. The JS code is below. locations.js var locations = ["coordinatesStore"] .map(id => document

问题 I'm struggling to figure out exactly how to get this to work, but essentially I have 2 models: class User class Profile One User has One Profile. I also have a SettingsController with "profile" and "update" actions: class SettingsController < ApplicationController def profile @profile = User.find_by_id(current_user).profile end def update set_profile respond_to do |format| if @profile.update(profile_params) format.html { redirect_to @profile, notice: 'Profile was successfully updated.' } else