I started my journey with Rails and Ruby a couple of days ago and so far it is going well and I'm loving it!
Though, I do have a minor concern that I cannot find a solution to. I've had a minor sneak peek on turbolink and how that is embedded with Rails. But, my question (problem?) is that whenever I import/include an image (which is located in app/assets/image) with Rails image_tag(...), that image is reloaded whenever I redirect to another page. But if I use <img src="..." whereas the src is an extern link (image fetched from another page) it is not being re-fetched (meaning, it's cached when I redirect to another page).
So my question is: is there a special way to apply turbolink to image_tag?
Thanks.
This is because you are running in development mode. Rails uses an "Asset Pipeline. When in development environment it reloads the assets.
When you come to production, you will see the difference.
You can read more about it here: http://guides.rubyonrails.org/asset_pipeline.html
Related
I have a very frustrating issue with a Rails 7 app after migrating to Ruby 3.2 with Esbuild.
Basically there is a few specific images that simply will not load, however, there are many others that load just fine that live in the same location, and are accessed the exact same way. It's driving me nuts.
I have cleared cached, restarted servers, cleared all the local build files, everything I can think of. This is also happening in both dev and production.
My Esbuild is running just fine, it is finding the files and compiling them with a finger print. The files all exist and are in the right location. (all sitting under app/assets/builds)
Accessing the file direcly in the browser, ie
http://localhost:4000/assets/logo_white_trans-QEBURZJB.png
Fails with a 404, cannot find the image. This file however exists with the correct name in the app/assets/builds folder.
Accessing another image from the page ie
http://localhost:4000/assets/leadstory-symbol-B5T7OIJB.png
Loads just fine.
It's almost like there is a static list of rails routes that match the images and it is not generating the route for some of these specific images, hence the 404, even though the file exists.
Some screenshots that highlight the odd behaviour
and the files listed in the directory, showing the file clearly exists
My package.json build step is
esbuild app/javascript/bundles/*.* --bundle --sourcemap --outdir=app/assets/builds --public-path=/assets --minify --log-limit=0 --loader:.js=jsx --loader:.png=file --loader:.svg=file
And a snip from the app of how its being loaded.
import LogoWhiteTrans from "../../assets/images/logo_white_trans.png";
<img src={LogoWhiteTrans} className="logo" alt="logo" />
Which looks to be working fine, the HTML outputs
<img src="/assets/logo_white_trans-QEBURZJB.png" class="logo" alt="logo">
The image can be loaded fine, from elsewhere in the app in a regular rails view using asset helpers (not from within the React app)
ie <%= asset_path('logo_white_trans.png') %>
Something I have noticed is in the logs, I see
ActionController::RoutingError (No route matches [GET] "/logo_white_trans-QEBURZJB.png"):
Notice there it does not say "/assets/logo_white_trans..."? I thought that was weird, as the URL in the image tag clearly has a /assets at the start. Trying either path does not work, with or without /assets directly in the browser. Just seems odd rails would see it that way
Im going nuts here, what am I missing. Its not a png specific issue, as other pngs are loading fine in the same way, nor is it an image issue the file exists and the naming is fine.
Is there some sort of manifest thats not being updated? An internal asset route list or something along those lines?
Im running Rails 7
Ruby 3.2
ESBuild
This isn't really an answer, but what I have ended up doing is moving all image assets out of the asset pipeline and into the public folder. I noticed that my assets were being duplicated by esbuilt and the rails asset precompile process, and basically the javascript build and rails eco system just do not work well together.
For anyone else having issues like this, we've just moved all our static assets in the public/images folder and we refernce the path /images/blah.png the same way in both React and Ruby now.
All image tags in either React or standard .erb views are just <img src="/images/blah.png/>. Its a lot cleaner.
Yes, we have given up asset finger printing, but its a small loss, considering most images never change and It's dramatically simplified things and sped up our build process considerably as it does not have to touch each file during precompilation.
Our views now also just have standard tags, instead of <asset_path> tags, which im sure is just quicker in general instead of ruby generating these asset strings all the time.
So, not really and answer to the initial question but it is a solution, and one i think anyone who is fusing modern javascript, react, typescript etc into a Rails app.
I work on apps that often have thousands of partials and finding what partial is rendering a section of HTML can be tedious and just waste time.
In development mode, it would sometimes be very helpful to turn on a config to have every partial used be prefaced with its path in an HTML comment so I could quickly know how to access and edit it.
Is there a config option for this or a gem that someone has made for this?
This functionality is built-in to recent rails versions for erb templates.
See here for details: https://blog.saeloun.com/2020/05/11/rails-support-annotates-html-output-with-template-file-names.html
That page mentions another option you could try.
Here is a link to the rails pr that introduced the change: https://github.com/rails/rails/pull/38848
I'm new to both Ruby on Rails and Locomotive CMS, but I'm just starting to create my first site with them.
I've got the engine running in a full Rails app (I'm going to need to deploy it on our own server later on). But it's just spitting out the 'Template' content defined through the admin interface, without any other template/content around it.
I can 'fix' it by shoving the html for the whole page in through this input field. But that's not right, surely? The Getting Started guide talks of putting the templates in the filesystem, at something like: Pages/index/first page. "All pages are inherited from index". I have an index.liquid under views/pages but it's not picking that up... (I've tried a couple of other locations too).
I'm sure this is a dumb question, but please could someone tell me where to put my template in the file system? Or how to point Locomotive to pick it up from the right place?
(I did get the file system liquid template working by defining it through the Rails way, with a route, a controller and adding a liquid template initializer I found here. But then it's missing the variables that should come from the CMS content).
I'm loading the site using bundle exec unicorn_rails. And I'm using Rails v3.2.13, Ruby v1.9.3 and Locomotive_cms v2.2.2.
Thanks!
I'm Didier from LocomotiveCMS.
LocomotiveCMS is a little bit different from the other CMS, in a sense, we offer a tool named Wagon to manage your site locally without having to install mongodb, rails and some other components.
Another huge benefit is that you can write your templates in HAML and your CSS in SASS/ SCSS or Less (we embedded Compass as well) and with our preferred texts editor (editing a whole site in a browser is a nightmare).
That's a nice eco-system in order to be super efficient when it comes to develop a LocomotiveCMS site.
Once you're done with your local work, you can deploy your site to a remote LocomotiveCMS engine in a similar way you push your application to Heroku. Actually, pushing a site will create the back-office for the final end user.
I suggest you to read that page.
http://doc.locomotivecms.com/guides/get-started/requirements
and this one too
http://www.locomotivecms.com/tour
Our message is still not clear on our official website but believe me, we are working to make it better.
Hope it will help you !
Didier
I'm learning to develop a web app using Rails on mac osx. I just added some css styling to my webpage. But every time I edit it and save it, and run rails s I cannot see the changes I made in the CSS on my webpage. I tried doing a hard refresh using COMMAND+SHIFT+R as well, but no luck. Any one know what's going on? I'm using firefox by the way.
Most likely, the css is being cached by the the web server. In your view, you need to add an autogenerated timestamp at the end of the css file name like so:
app.css?t=12044402444
or disable caching in your web server of choice.
I have put all my images for my admin theme in the assets folder within a folder called admin. Then I link to it like normal ie.
# Ruby
image_tag "admin/file.jpg" .....
#CSS
.logo{ background:url('/assets/images/admin/logo.png');
FYI. Just for testing I am not using the asset_path tag just yet as I have not compiled my assets.
Ok all good so far until I decided to update an image. I replaced some colors but on reload the new styled image is not showing. If I view the image directly in the browser its still showing the old image. Going one step further I destroyed the admin images folder. But it has broken nothing all the images are still being displayed. And yes I have cleared my cache and have tried on multiple browsers.
Is there some sort of image caching going on? This is just local development using pow to serve the pages.
Even destroying the whole images folder the images are still being served.
Am I missing something?
In 3.1 you just get rid of the 'images' part of the path. So an image that lives in /assets/images/example.png will actually be accessible in a get request at this url - /assets/example.png
Because the assets/images folder gets generated along with a new 3.1 app, this is the convention that they probably want you to follow. I think that's where image_tag will look for it, but I haven't tested that yet.
Also, during the RailsConf keynote, I remember D2h saying the the public folder should not have much in it anymore, mostly just error pages and a favicon.
You'll want to change the extension of your css file from .css.scss to .css.scss.erb and do:
background-image:url(<%=asset_path "admin/logo.png"%>);
You may need to do a "hard refresh" to see changes. CMD+SHIFT+R on OSX browsers.
In production, make sure
rm -rf public/assets
bundle exec rake assets:precompile RAILS_ENV=production
happens upon deployment.
For what it's worth, when I did this I found that no folder should be include in the path in the css file. For instance if I have app/assets/images/example.png, and I put this in my css file...
div.example { background: url('example.png'); }
... then somehow it magically works. I figured this out by running the rake assets:precompile task, which just sucks everything out of all your load paths and dumps it in a junk drawer folder: public/assets. That's ironic, IMO...
In any case this means you don't need to put any folder paths, everything in your assets folders will all end up living in one huge directory. How this system resolves file name conflicts is unclear, you may need to be careful about that.
Kind of frustrating there aren't better docs out there for this big of a change.
In rails 4 you can now use a css and sass helper image-url:
div.logo {background-image: image-url("logo.png");}
If your background images aren't showing up consider looking at how you're referencing them in your stylesheets.
when referencing images in CSS or in an IMG tag, use image-name.jpg
while the image is really located under ./assets/images/image-name.jpg
http://railscasts.com/episodes/279-understanding-the-asset-pipeline
This railscast (Rails Tutorial video on asset pipeline) helps a lot to explain the paths in assets pipeline as well. I found it pretty useful, and actually watched it a few times.
The solution I chose is #Lee McAlilly's above, but this railscast helped me to understand why it works. Hope it helps!
The asset pipeline in rails offers a method for this exact thing.
You simply add image_path('image filename') to your css or scss file and rails takes care of everything. For example:
.logo{ background:url(image_path('admin/logo.png'));
(note that it works just like in a .erb view, and you don't use "/assets" or "/assets/images" in the path)
Rails also offers other helper methods, and there's another answer here: How do I use reference images in Sass when using Rails 3.1?