[Ruby On Rails] How to search the contents of params using include?

It is a memorandum.

retrieval method

params.require(:Model name).permit(:Column name).to_s.include?("Search word")

By writing to_s, the data contained in the "permit (: column name)" column will be treated as a character string.

Example when update is possible

Example ①

controller.rb

  def update
    if params.require(:fridge).permit(:icecream).to_s.include?("Gari-gari")
      @fridge.update(fridge_params) 
      redirect_to root_path
    else
      render :edit
    end
  end

  def fridge_params
    params.require(:fridge).permit(:vegetable, :meat, :icecream).merge(user_id: current_user.id)
  end

params

Parameters: {"authenticity_token"=>"XXX==", "fridge"=>{"vegetable"=>"eggplant", "meat"=>"beef", "icecream"=>"Gari-gari"}

Example ②

controller.rb

  def update
    if params.require(:fridge).permit(:icecream).to_s.include?("Yukimi Daifuku")
      @fridge.update(fridge_params) 
      redirect_to root_path
    else
      render :edit
    end
  end

  # fridge_params is omitted hereafter

params

Parameters: {"authenticity_token"=>"XXX==", "fridge"=>{"vegetable"=>"green pepper", "meat"=>"pork", "icecream"=>"Yukimi Daifuku"}

Example ③

controller.rb

  def update
    if params.require(:fridge).permit(:meat).to_s.include?("chicken")
      @fridge.update(fridge_params) 
      redirect_to root_path
    else
      render :edit
    end
  end

params

Parameters: {"authenticity_token"=>"XXX==", "fridge"=>{"vegetable"=>"Tomato", "meat"=>"Pork and chicken", "icecream"=>"jumbo"}

Example when update is not possible

Example ①

controller.rb

  def update
    if params.require(:fridge).permit(:vegetable).to_s.include?("Bean sprouts")
      @fridge.update(fridge_params) 
      redirect_to root_path
    else
      render :edit
    end
  end

params

Parameters: {"authenticity_token"=>"XXX==", "fridge"=>{"vegetable"=>"Chinese chive", "meat"=>"beef", "icecream"=>"Refreshing"}

Example ②

controller.rb

  def update
    if params.require(:fridge).permit(:vegetable).to_s.include?("Broccoli")
      @fridge.update(fridge_params) 
      redirect_to root_path
    else
      render :edit
    end
  end

params

Parameters: {"authenticity_token"=>"XXX==", "fridge"=>{"vegetable"=>"broccoli", "meat"=>"Mutton", "icecream"=>"Refreshing"}

Example ③

controller.rb

  def update
    if params.require(:fridge).permit(:icecream).to_s.include?("Giant corn")
      @fridge.update(fridge_params) 
      redirect_to root_path
    else
      render :edit
    end
  end

params

Parameters: {"authenticity_token"=>"XXX==", "fridge"=>{"vegetable"=>"Potatoes", "meat"=>"Human flesh", "icecream"=>"Gian and corn"}

important point

Just limiting the character strings you want to save with the controller does not mean that it will play the save in the DB. You may need to be careful when using it.

Reference article

https://stackoverflow.com/questions/57625775/how-to-check-if-parameters-string-contains-a-substring https://stackoverflow.com/questions/5629402/how-to-test-if-parameters-exist-in-rails/5629506