How to store string as array in database column using Ruby on Rails

问题

This question is asked many times on SO. The main problem is nothing got fits into my situation.

Case is, I am not able to store typed content as array in database column.

text_field whose code is:

= text_field_tag 'product[keywords][]', @product.keywords, class: 'tab-input
product_keywords'

In controller strong parameters are:

params.require(:product).permit(:id, :name, :keywords => [])

Jquery code that is not not removing value upon deletion when typed wrong value but it add commas after each element as I want to take commas seperated value in one column.

  $(document).on 'keyup', '.product_keywords', ->
    keyword = @value.replace(/(\w)[\s,]+(\w?)/g, '$1, $2')
    if keyword != @value
      @value = keyword
    return

model code:

serialize :keywords, Array

migration code:

class AddKeywordsToProducts < ActiveRecord::Migration[5.1]
  def change
    add_column :products, :keywords, :text
  end
end

So, if someone writes, abc and hit space a comma is added in the end. after three typed words it will look like:

abc, dbx, she

now I want to store it as array in column but its not storing properly. it stores as:

["abc, dbx, she"]

Also please can anybody tell me the best cases to handle these cases? Plus best practices to deal with such cases using ruby so I will learn it for future?

回答1:

You probably want a custom serializer as shown here. So instead of:

serialize :keywords, Array

You might do somewhat like:

serialize :keywords, KeywordSerializer

And somewhere in helpers:

class KeywordSerializer 
  def self.dump(what)
    what.join(", ")
  end
  def self.load(what)
    what.split(/\s*,\s*/)
  end
end

回答2:

Passing array elements using single form tag is not possible to pass as a array and passing array as a string, you need to process it near white-listing your params,

permitted_params = params.require(:product).permit(:id, :name, :keywords => [])
permitted_params[:keywords] = permitted_params[:keywords][0].split(/\s*,\s*/)

来源：https://stackoverflow.com/questions/53984862/how-to-store-string-as-array-in-database-column-using-ruby-on-rails

标签

ruby-on-rails

arrays

ruby

ruby-on-rails-5.1