How to remove empty parameters from params hash?

Question

In my Rails 4 application I have this setup:

class InvoicesController < ApplicationController

  def index
    @invoices = current_user.invoices.search(params)
  end

  ...

end

---

class Invoice < ActiveRecord::Base

  belongs_to :user

  def self.search(params)
    data = all
    data = data.where("number LIKE ?", "%#{params[:number]}%") if params[:number]
    data = data.where("total > ?", params[:minimum]) if params[:minimum]
    data = data.where("total < ?", params[:maximum]) if params[:maximum]
    data
  end

  ...

end

The problem is that I have a bunch of other GET parameters which are all part of the params hash. How can I remove the blank parameters from the URL so that I don't end up with URLs like:

/invoices?after=&before=&maximum=&minimum=&number=

Thanks for any help.

Answer 1

Put this after the hash:

.reject{|_, v| v.blank?}

Answer 2

Rails 6.1+

Rails 6.1 added compact and compact! to ActionController::Parameters in order to remove nil values from params hash.

params.compact

params.compact!

Here is a link to PR.

---

Rails 6.1 added compact_blank and compact_blank! to ActionController::Parameters in order to remove blank values from params hash.

params.compact_blank

params.compact_blank!

Here is a link to PR.

Examples of blank values:

nil, '', ' ', [], {}, false