RoR中的动态条件查询

Question

I'm trying to make query in RoR, but my conditions are coming from params and changing dynamically.

I've tried this:

@userlist = User.find(:all, conditions:{(name:params[:name] if params[:name] != nil), (lastname:params[:lastname] if params[:lastname] != nil)})

It's just my imagination, but shows what I mean.

thanx

Answer 1

If you're on Rails 3:

@userlist = User.scoped
@userlist = @userlist.where(name: params[:name]) if params[:name].present?
@userlist = @userlist.where(lastname: params[:lastname]) if params[:lastname].present?

etc..

Answer 2

you could do something like:

BlahController < ActiveController::Base
  before_filter :find_params, :only => :index

  def index
    @user_list = User.where(@filtered_params).all
  end

  def find_params
    @filtered_params = params[:name].present? ? "'name = ?', #{params[:name]}" : "'last_name = ?', #{params[:last_name]}"
  end

end

So I assume you only have two conditions, a params[:name] or a params[:last_name] . If there are more, simply change the ternary to a if elsif statement.