Params require array rails

params require array rails

Allows you to choose which attributes should be permitted for mass updating and thus prevent accidentally exposing that which shouldn't be exposed. Provides two methods for this purpose: require and permit. The former is used to mark parameters as required. The latter is used to set the parameter as permitted and limit which attributes should be allowed for mass updating. The default is false. The values can be false to just filter them out, :log to additionally write a message on the logger, or :raise to raise ActionController::UnpermittedParameters exception.

The default value is :log in test and development environments, false otherwise. In a multi-threaded environment they should only be set once at boot-time and never mutated at runtime.

You can fetch values of ActionController::Parameters using either :key or "key". This list is in particular used to filter ordinary requests, String goes as first element to quickly short-circuit the common case.

If you modify this collection please update the API of permit above. Returns a new instance of ActionController::Parameters. Also, sets the permitted attribute to the default value of ActionController::Parameters. Source: show on GitHub. Returns true if another Parameters object contains the same content and permitted flag. Assigns a value to a given key. The given key may still get filtered out when permit is called.

Defined in a method to instantiate it only if needed. Testing membership still loops, but it's going to be faster than our own loop that converts values. Also, we are not going to build a new array object per fetch. Deletes a key-value pair from Parameters and returns the value. If key is not found, returns nil or, with optional code block, yields key and returns the result.

Extracts the nested parameter from the given keys by calling dig at each step. Returns nil if any intermediate step is nil. Calls block once for each key in the parameters, passing the key. If no block is given, an enumerator is returned instead.

Returns a new ActionController::Parameters instance that filters out the given keys. Returns a parameter for the given key. If the key can't be found, there are several options: With no other arguments, it will raise an ActionController::ParameterMissing error; if a second argument is given, then that is returned converted to an instance of ActionController::Parameters if possible ; if a block is given, then that will be run and its result returned. Returns a new ActionController::Parameters instance that includes only the given filters and sets the permitted attribute for the object to true.

This is useful for limiting which attributes should be allowed for mass updating. Otherwise, the key :name is filtered out. You may declare that the parameter should be an array of permitted scalars by mapping it to an empty array:.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

params require array rails

In the Rails 3 app, when I create a new question, it inserts into questions table and then into the categorizations table. In the rails 4 app, after it processes the parameters in QuestionController create, I'm getting this error in the server logs.

To declare that the value in params must be an array of permitted scalar values map the key to an empty array:. If you want to permit an array of hashes or an array of objects from the perspective of JSON.

I can't comment yet but following on Fellow Stranger solution you can also keep nesting in case you have keys which values are an array. Like this:. Learn more. Asked 6 years, 11 months ago. Active 4 months ago. Viewed k times. These are the three relevant models are the same for the two versions.

Leahcim Leahcim What does the create action look like in both apps? Active Oldest Votes. To declare that the value in params must be an array of permitted scalar values map the key to an empty array: params.

Yarin k gold badges silver badges bronze badges.Rails 4 introduced the pattern of strong parameters at the controller layer. As a best practice, you will explicitly list the parameters that an endpoint should accept in payloads.

Arrays are specified just slightly different. You don't want those blackhats to update any field they want on your poor models. Raise the shields -- strong parameters! Since Rails 4, it has been best practice to move this responsibility to the controller. At that layer, you can make adjustments and allowances on a per-endpoint basis eg, admin functionality has more power over a particular model than the layman user.

So, create a private function in your controller where you can filter your params for your model. It might look like:. The most standard use case for permit is to pass it a collection of :symbols. These keys must represent scalar values string, number, that sort only. But what about arrays?

They're represented differently by an empty array:. But wait -- one more problem, and I don't like the answer here. My client might send back a nil instead of an array ie, when the luchador has no wins.

If this happens, cue ugly error:. Strong Parameters You don't want those blackhats to update any field they want on your poor models. They're represented differently by an empty array: params.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am trying pass array as parameter to my controller method but it's not working for me. I tried it in following ways:. If you are trying to send parameter like [1,2], then in your controller you will get like "[1,2]". If you want to pass an array in query string, you need to pass it as follow as you have mentioned in question :. Learn more. ROR passing array as parameter Ask Question.

Asked 4 years, 8 months ago. Active 2 years, 11 months ago. Viewed 3k times. Need some help. Thank you. If I am reading question correctly,? Active Oldest Votes. If you are trying to send parameter like [1,2], then in your controller you will get like "[1,2]", and you need to parse for get in original array like: JSON.

Sudhir Sudhir 1 1 silver badge 4 4 bronze badges. You cannot get array from query string like this:?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.

params require array rails

Already on GitHub? Sign in to your account. Here it will be one line for each params, so say if I require 10params, it will be 10lines of repeated code which is not DRY. So I propose a method which does this in one line:.

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If that's more preferable I can do that too. As its not important to me if its one method or two methods. I just want to have an ability to require multiple params in single call. Typically the pattern is to use require for parent hashes, and permit for individual attributes. An individual attribute requirement is usually checked by model validation. Validations work well if you want to store a value. But incase of larger apps where same model is being used in multiple controllers Web vs API controllers for exampleit gets you into conditional callbacks which are not exactly clean.

This is where ability to require params at controller level is simple, clean way. Now, I am curious to know what are the cons of this approach according to you.

The issue is that in Strong Parameters, permit is the heart of the logic that marks the attribute as whitelisted for future use in models. If using require on individual attributes, you'd still need to permit them as well, or they will not be accepted by model the most common use caseand require doesn't automatically permit the attribute.

Permit Array in Rails Strong Parameters

Therefore I think its the permit statement which could be enhanced with requires, e. In above example, email and name would be required and permitted attributes of userwhile phone would be optional and permitted.

Rails: Generating Enum Hash Filter

If you ask for one key, you just get that value directly. If you ask for multiple keys, you get an array of values. This of course means that params. But imo that's fine. Then we can combine it with permit by returning a hash-like object that responds to permit :. It's up to debate whether using this syntax should implicitly permit thing1 and thing2 to avoid having to repeat them in the permit part, but technical implementation could go either way.

I don't want to mix require and permit semantics. Require means return the value, raise if its not there. Permit means, return key in a hash, no raising. If that's the case, then I have a concern.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

I have a private method like this for a registration form which has four fields, firstnameemailpassword and confirm password. I am not sure how to check for password confirmation. In that case, this is how you will use params. Learn more. Asked 5 years, 10 months ago. Active 1 year, 3 months ago. Viewed 3k times. How do i convert the code below to use params.

Is your field name is confirmpassword? Then if you want to whitelist it,you have do it like this params. Active Oldest Votes. Looking at your code User. Paritosh Piplewar Paritosh Piplewar 7, 4 4 gold badges 19 19 silver badges 38 38 bronze badges.

params require array rails

I have a password confirmation field? Currently you have said confirm password. Sign up or log in Sign up using Google.Most likely, we want to access data sent in by the user or other parameters in our controller actions. Rails does not make any distinction between query string parameters and POST parameters, and both are available in the params hash in our controller:. The params hash is not limited to one-dimensional keys and values. It can contain arrays and nested hashes.

To send an array of values, append an empty pair of square brackets "[]" to the key name:. The value of params[:ids] will now be ["1", "2", "3"]. Note that parameter values are always strings; Rails makes no attempt to guess or cast the type.

If we're writing a web service application, we might be more comfortable accepting parameters in JSON format. Also, if we've turned on config. The parameters will be cloned and wrapped in the key according to our controller's name by default. And assume that we're sending the data to CompaniesController, it would then be wrapped in :company key like this:. The params hash will always contain the :controller and :action keys. As an example, consider a listing of users where the list can show either active or inactive users.

We can add a route which captures the :status parameter in a "pretty" URL:. When this route is used, params[:foo] will also be set to "bar" just like it was passed in the query string. In the same way params[:action] will contain "index". The one we got is called strong parameterswhich requires us to tell Rails exactly which parameters are allowed into our controller actions.

This is to protect us from "mass assignment" though the ability to grab and automatically assign all controller parameters to our model in one shot makes our job easier.

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Here is the same code from Getting Started with Rails that triggers the error:. In this case, we want to both allow and require the title and text parameters for valid use of create. The syntax for this introduces require and permit. This is often factored out into its own method so it can be reused by multiple actions in the same controller, for example create and update.

We often put a method into private section so that we want to make sure it can't be called outside its intended context. Here is how we do it:. I hope this site is informative and helpful. Toggle navigation BogoToBogo. Controller and Parameters Bogotobogo's contents To see more items, click left or right arrow. Sponsor Open Source development activities and free contents for everyone.


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