pg_search不返回单个字段的结果

Question

我为我的“资产”模型提供了一个搜索页面，除了搜索“serial_no”字段特定的任何内容外，一切工作都正常。

Asset.rb

# == Schema Information 
# 
# Table name: assets 
# 
# id    :integer   not null, primary key 
# asset_description :string(255) 
# asset_type  :string(255) 
# status   :string(255) 
# serial_no   :string(255) 
# user_id   :integer 
# cost    :decimal(,) 
# barcode   :string(255) 
# comment   :string(255) 
# date_purchased :date 
# created_at  :datetime  not null 
# updated_at  :datetime  not null 
# 
class Asset < ActiveRecord::Base 
    attr_accessible :asset_description, :asset_type, :comment, 
    :date_purchased, :serial_no, :status, :user_id, :cost, :barcode 
    belongs_to :user 
    validates :user_id, presence: true 
    validates :asset_description, presence: true 
    validates :asset_type, presence: true 
    validates :serial_no, presence: true, uniqueness: true 
    validates :status, presence: true 
    validates :comment, length: { maximum: 150 } 

    include PgSearch 
    pg_search_scope :search, against: [:asset_description, :status, :asset_type, 
    :comment, :cost, :serial_no, :date_purchased], 
    using: {tsearch: { dictionary: "english" }}, 
    associated_against: { user: :name } 

    #older assets first 
    default_scope order: 'assets.created_at ASC' 

    def self.text_search(query) 
    if query.present? 
     search(query) 
    else 
     scoped 
    end 
    end 
end 

例如，我与serial_no资产：Z21313412A但是当我搜索 “Z” 不返回任何结果。我一直试图解决这个问题几个星期，但没有运气。

Answer 1

Acording到documentation：

PostgreSQL’s full text search matches on whole words by default. 
If you want to search for partial words, however, you can set :prefix to true. 
Since this is a :tsearch-specific option, you should pass it to :tsearch 
directly, as shown in the following example. 

也许将:prefix到配置解决了这个问题。从GitHub的页面
示例：

pg_search_scope :whose_name_starts_with, 
       :against => :name, 
       :using => { 
       :tsearch => {:prefix => true} 
       }