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The Safe Navigation Operator (&.) in Ruby

This incredible method makes you safely navigate through nested objects when dealing with third party APIs. It also makes it makes easy to refactor projects using OpenStruct s structures and replace those with hashes. The dig is basically an elvis operator for hashes and arrays.

Ruby 2. With digyou can navigate through it without worrying about nil s or invalid attributes, allowing you to create a wrapper around this response object. Way nicer than using a bunch of ActiveSupport try s everywhere. The good part on OpenStruct is also its biggest disadvantage: it allows flexible attributes, making objects completely unpredictable. Now consider this: the Address class could actually return an empty OpenStruct instead of a populated one, or worse, just a null object.

You would get NoMethodError being raised on almost every step you take when navigating this object. Now that we have power to dig up this, we could transform everything into a hash and just dig it!

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This is way more readable and faster than very slow Ruby OpenStructs. Worst case scenario is a 1. Yep, this is fast enough.

rails params require multiple

The new dig method versatility is amazing, as it now provides Ruby programmers the ability of querying unknown objects with ease and safety. Tiago Padrela Amaro Geek and coder. No more OpenStructs! Comparison: Array navigation not found: GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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Sign in to your account. Hey, currently this is not considered Hash, so. This is correct behavior -- ActionController::Parameters is not a hash anymore. This means that isn't Ruby or Rails' fault that dig doesn't work -- it's just the new way that the public API is structured. See and for more details about this change in behavior.

It is a really convenient API, and developers will get used to it as 2. I don't see how it would expose any security issues that aren't already exposed by []since it can be just a wrapper around that existing API:. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. New issue.

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This comment has been minimized. Sign in to view. I get that this is the correct behavior - ActionController::Parameters is not a hash. Sign up for free to join this conversation on GitHub. Already have an account?

Sign in to comment. Linked pull requests. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again.

If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. If any one of the required parameters is missing, your action handler will not be called at all. Instead, an error hash that looks like this will be served with Bad Request:. The gem is available as open source under the terms of the MIT License. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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rails params require multiple

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Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit Fetching latest commit…. You signed in with another tab or window.

Reload to refresh your session. You signed out in another tab or window.I recently had a requirement to create a single form with data from more than one record.

rails params require multiple

This is a simple request, but I had never done it before in Rails. After experimenting for a while and reading quite a few forum posts and StackOverflow answers I came up with a working solution. Hopefully this will save someone a little time in the future. Each user will have a first name, last name, and e-mail address. Next, add the new routes for editing all users.

I tried to stick to the RESTful convention with these. The only thing it needs to do is get all users. The interesting part of this code starts around line 9.

As expected, we iterate over the users with users. The next line tells Rails to name the fields for each user with array notation. The key for each of these hashes will be the user id. We iterate over each key in params['user']then find and update the user associated with that id. I am leaving error checking as an exercise for the reader…. Hey, great article. Anthony, thanks for the great post.

I have one question I posted on StackOverflow and referenced your site.

【Rails入門】params使い方まとめ

I am using Rails 4 and it requires defining permissible fields inside the controller. I am running into an error and was hoping you might be able to help? Thank you! Hey again, Anthony. I think I found a solution for Rails 4 strong parameters. I wanted to share just in case your other readers may want to know, too. I modified the code to fit your model above.

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Now you can: User. Magnificent, thanks so much Anthony. Really helped a newbie out. Skip to content. Other than that it was extremely helpful! This was brilliant thanks! Thanks a lot, Cheers.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. From what I can tell, strong parameters currently has no ability to permit a hash with unknown keys.

I would have expected that passing an empty hash as an permitted value would allow a hash to be passed through. Assigning the data parameter separately is an option but it complicates my code unnecessarily -- I would prefer to be able to stick with mass-assignment for all attributes. Happy to work on a patch for this if this proposal is reasonable. I've only just started looking into strong parameters though so there may be drawbacks I haven't considered.

Another possibility which I think I like even better would be to allow permit! I think your 2. We wanted to keep the API on point to handle the most common situations. As assigning a hash with unknown keys more or less defeates the purpose of strong parameters restricting allowed keysIt's not supported because it could make your code vulnerable.

As you mentioned already you can simply fall back on a normal assignment if you know that you want to permit unknown keys. Confirm, the API is designed to whitelist every single key. If your use case does not fit well then you need to resort to Ruby. That flexibility is also by design, in the end it is just Ruby. I would argue that this actually makes the API more consistent, since permit! Except you'd only be permitting an unknown hash on a single key within the params.

It's certainly more secure than doing a permit! My main problem with this is that I go from having to test one message Product.

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The separate assignment for my hash also has to be duplicated across both my create and update actions.The most interesting addition to Ruby 2. A similar operator has been present in C and Groovy for a long time with a slightly different syntax -?.

So what does it do? If you want to be safe and not risk a nil error, you would write something like the following:. This is really verbose and annoying to type. ActiveSupport includes the try method which has a similar behaviour but with few key differences that will be discussed later :. It accomplishes the same thing - it either returns the address or nil if some value along the chain is nil.

The first example may also return false if, for example, the owner is set to false. The syntax is a bit awkward but I guess we will have to deal with it because it does make the code more compact. No surprises so far. What if owner is false unlikely but not impossible in the exciting world of shitty code?

As Joeri Samson pointed out in the comments, this section is actually wrong - I mistakenly used?. The dig method is, in my opinion, the most useful feature in this version. No longer do we have to write abominations like the following:.

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We can now simply use Hash dig and accomplish the same thing:. I really dislike dealing with nil values in dynamic languages check my previous posts and think the addition of the safe operator and the dig methods are really neat.

Yanking Webpacker out of Rails 6 How to use Rails without webpacker. Benchmarking Ruby How to benchmark ruby code and compare different solutions to a problem. The Null Object pattern A technique for dealing with certain nil errors.

rails params require multiple

Rails migration generator - how to specify decimal precision and scale.Tag: ruby-on-railsrest. The " parsing the response to JSON " bit is handled by the scaffolding. The issue comes when trying to use the strong parameters method scaffolded. And why is the user even required in the first place, if that's exactly what I intend to create?

Aside from this security check, it returns pretty much what params[:user]. This requires that the params hash is of the form. The problem with doing params. From that docs: Produces a shallow copy of obj—the instance variables of obj are copied, but not the objects they reference. If you are not sure how deep your object It's not "through Hash", it's "array access" operator. That log excert is from a one off dyno, a la heroku run console - this is entirely seperate to your web dynos which you may be runnning 2x dyno's for.

The standard way to use a search would be to include a parameter in the URL. When you are using nested routes you need to get the parent id from the parameters and merge it with the form parameters. Strong parameters Rails sends form parameters in nested hashes. It'll work without any issue, as Active Record wraps-up these callback methods in a single transaction.

Since the object is destroyed in first yield, it seems the later is not feasible assuming everything is running in one thread. How Rails handles this? No, object isn't destroyed in first yield.

Just the way you catch every other error begin Transaction. You can use an API key, however - as you wrote - it's pure protection and easily accessible value - potential abuser just needs to view the source or investigate the queries. At the beginning of the session not in traditional meaning I'm pretty sure it's nil in your case In order to do that, they would need to have prior Maybe it makes extract the planet as another model?

As it is a truthy value, the check will pass always, regardless of what are the results of evaluating Telling it short, this value limits the amount of simultaneously opened files for multipart requests.

To understand better what is multipart, you can see this question. The reason for this limitation is an ability to better adjust your app for your server. If you have too many files opened at Take a look at merit gem. Even if you want to develop your own badge system from scratch this gem contains plenty of nice solutions you can use.


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