红宝石-用select_tag搜索表单

Question

I have 2 models, Post and Location, where location has_many posts and post belongs_to location. I want to make a search function with 3 conditions. With the following code it did not return any thing in my testing.

View search.html:

<%= form_tag search_posts_path, :method => 'get' do %>
    <p>
        <%= text_field_tag :title, params[:title] %>
        <%= text_field_tag :company, params[:company] %>
        <%= select_tag :location_id, options_from_collection_for_select(Location.all, :id, :name, params[:location_id]), include_blank: true %>
        <%= submit_tag "Search", :name => nil %>
    </p>
<% end %>

Controller post_controller.rb:

  def search
    title = params[:title]
    company = params[:company]
    location_id = params[:location_id]
    @posts = Post.search(title, company, location_id)
  end

Model Post.rb

def self.search(title, company, location_id)
    return scoped unless title.present? || company.present? || location_id.present?
where(['title LIKE ? AND company LIKE ? AND location_id = ?', "%#{title}%", "%#{company}%", "%#{location_id}%"])
end

Answer 1

There is no need of '%' for location_id if location_id is not a string.Hope this helps.

Model Post.rb

def self.search(title, company, location_id)
  return scoped unless title.present? || company.present? || location_id.present?
  where(['title LIKE ? AND company LIKE ? AND location_id = ?', "%#{title}%", "%#    
  {company}%", location_id])
end

Answer 2

You don't need % around our location_id and you shouldn't convert it to string

Few debugging tips for future reference:

a) Check whether this actually should return anything - does such a record exists in current db?

b) Try runnig the query through console. You can use .to_sql on relation object to see what SQL is executed

c) If no results, try break your where conditions and check which bit works and which doesn't (I'm almost sure the problem is related with data types for location_id)