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August 9, 2021 12:33
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Rails examples: Single Table Inheritance (STI), strong parameters, single controller.
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# Variant 1 | |
def user_params(type) | |
params.require(type.to_sym).permit(attributes) | |
end | |
# Variant 2 | |
def user_params(type) | |
case type | |
when "user" | |
params.require(:user).permit(user_attributes) | |
when "apprentice" | |
params.require(:apprentice).permit(apprentice_attributes) | |
end | |
end | |
# Variant 3 | |
def update | |
... | |
if @user.update(send("#{@user.type.underscore.to_sym}_params")) | |
... | |
end | |
def user_params | |
params.require(:user).permit(attributes) | |
end | |
def apprentice_params | |
params.require(:apprentice).permit(attributes) | |
end | |
# Variant 4 | |
https://github.com/T-Dnzt/sti-with-rails4/blob/master/app/controllers/animals_controller.rb |
If the list gets too long I took an approach where I defined the permitted attributes in every model
# products_controller.rb
def product_class
@product_class ||= params[:product][:type].camelcase.constantize
end
def create
product_class.new product_params
end
def product_params
@product_params ||= product_class.permitted_attributes_from_params(params[:product])
end
# product/product_a.rb
class ProductA < Product
def self.permitted_attributes_from_params(params)
parameters = ActionController::Parameters.new(params)
parameters.permit(:name, :price).tap do |whitelisted|
whitelisted[:hash_attribute] = params[:hash_attribute] # this is in case the hash keys are dynamic
end
end
end
Again, this approach is for when the possible amount of permitted gets crazy big cause of STI.
Thank you this worked wonderfully!
Just stumbled upon this and found a handy solution for my problem, thank you :)
Thanks! To get the name of the model used in the parameters, you can also use:
@model_instance.model_name.param_key
And what about that?
def user_params
type = @user.type.underscore.to_sym
params.require(type).permit(:name, :age)
end
Thanks! To get the name of the model used in the parameters, you can also use:
@model_instance.model_name.param_key
👍 - cleanest IMO. Thanks @flavio-b!
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For multipart product names (like in my case CoreProduct, AddonProduct...) adding an underscore
call is needed to get the model name to the right format.