Rails: Parameterfilter::Compiled_Filter Tries to Dup Symbol

How to filter nested parameters from Rails logs

Simply put this in application.rb:

config.filter_parameters += [:data]

This would filter nested [:data] keys also.

In rails 5, you can define hierarchy of the key:

config.filter_parameters += ["download.data"]

This would filter all the [:data] keys which have [:download] as the immediate parent.

Encoding parameters with multiple duplicate keys

Ran into a similar issue, there's a helpful post here Ruby Hash with duplicate keys? but briefly

params = {}.compare_by_identity
params['input'] = "webpage/url:http://www.example.com"
params['input'.dup] = "keywords:some+keywords"

then

params.to_query

returns

"input=keywords%3Asome%2Bkeywords&input=webpage%2Furl%3Ahttp%3A%2F%2Fwww.example.com"

Rails - Parameter with multiple values in the URL when consuming an API via Active Resource

to create a valid query string, you can use

params = {a: 1, b: [1,2]}.to_query

http://apidock.com/rails/Hash/to_query

http://apidock.com/rails/Hash/to_param

Rails - passing parameters in link_to

First of all, link_to is a html tag helper, its second argument is the url, followed by html_options. What you would like is to pass account_id as a url parameter to the path.
If you have set up named routes correctly in routes.rb, you can use path helpers.

link_to "+ Service", new_my_service_path(:account_id => acct.id)

I think the best practice is to pass model values as a param nested within :

link_to "+ Service", new_my_service_path(:my_service => { :account_id => acct.id })

# my_services_controller.rb
def new
  @my_service = MyService.new(params[:my_service])
end

And you need to control that account_id is allowed for 'mass assignment'. In rails 3 you can use powerful controls to filter valid params within the controller where it belongs. I highly recommend.

http://apidock.com/rails/ActiveModel/MassAssignmentSecurity/ClassMethods

Also note that if account_id is not freely set by the user (e.g., a user can only submit a service for the own single account_id, then it is better practice not to send it via the request, but set it within the controller by adding something like:

@my_service.account_id = current_user.account_id 

You can surely combine the two if you only allow users to create service on their own account, but allow admin to create anyone's by using roles in attr_accessible.

hope this helps

Rails: Preserving GET query string parameters in link_to

link_to 'Link', request.query_parameters.merge({:per_page => 20})

Ruby: Easiest Way to Filter Hash Keys?

Edit to original answer: Even though this is answer (as of the time of this comment) is the selected answer, the original version of this answer is outdated.

I'm adding an update here to help others avoid getting sidetracked by this answer like I did.

As the other answer mentions, Ruby >= 2.5 added the Hash#slice method which was previously only available in Rails.

Example:

> { one: 1, two: 2, three: 3 }.slice(:one, :two)
=> {:one=>1, :two=>2}

End of edit. What follows is the original answer which I guess will be useful if you're on Ruby < 2.5 without Rails, although I imagine that case is pretty uncommon at this point.

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If you're using Ruby, you can use the select method. You'll need to convert the key from a Symbol to a String to do the regexp match. This will give you a new Hash with just the choices in it.

choices = params.select { |key, value| key.to_s.match(/^choice\d+/) }

or you can use delete_if and modify the existing Hash e.g.

params.delete_if { |key, value| !key.to_s.match(/choice\d+/) }

or if it is just the keys and not the values you want then you can do:

params.keys.select { |key| key.to_s.match(/^choice\d+/) }

and this will give the just an Array of the keys e.g. [:choice1, :choice2, :choice3]

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