How to create multiple records and handle validations with create method in rails?

Question

I want to create multiple records at once but if there are any record which was not created because of any validation error then it should handle that error in some way.

PARAMETERS

  Parameters: {"group"=>[{"sort_by"=>"id", "template_ids"=>[182], "name"=>"Csdfwses", "count"=>1}, {"sort_by"=>"id", "template_ids"=>[181], "name"=>"rthydrt", "count"=>1}]}

So my controller's create method is like this:

def create
  @groups = Group.create group_params
   if @groups
    render json: { success: true, message: "#{@groups.length} groups created" }
   else
    render_422 @groups, 'Could not save groups.'
   end
end

i want to handle the case if there is any error occurred while creating any record such that after creating it should display the error message.

With the above approach there is no way to use error method here. How to show the error messages?

I tried using begin-rescue:

 def create
  begin
   @groups = Group.create! group_params
    if @groups
     render json: { success: true, message: "#{@groups.length} groups created" }
    else
     render_422 @groups, 'Could not save groups.'
    end
  rescue ActiveRecord::RecordInvalid => invalid
    render json: { success: false, message: "#{invalid.record.errors.messages}" }, status: 500
  end
 end

But i'm looking for the cleaner approach if there is any?

Answer 1

You want to pass an array of hashes to model.create to create multiple records at once.

def create
  @groups = Group.create group_params
   if @groups.all? { |group| group.persisted? }
    render json: { success: true, message: "#{@groups.length} groups created" }
   else
    render_422 @groups, 'Could not save groups.'
   end
end

If you want to display any validation errors, then you will want to look in model.errors or for a nice array of errors you can look at model.errors.full_messages.

def create
  @groups = Group.create group_params
   if @groups.all? { |group| group.persisted? }
    render json: { success: true, message: "#{@groups.length} groups created" }
   else
    errors = @groups.select(&:invalid?).map{ |g| g.errors.full_messages }.join("<br/>") 
    render_422 @groups, "Could not save groups. Here are the errors: #{errors}"
   end
end

You will want to format the errors better, but this is a simple example.