活動記錄文本匹配

Question

我想在Ruby中使用活動記錄做一些基本的文本匹配。

Here is my code so far; 

require 'active_record' 
require 'yaml' 
require 'pg' 
require 'pry' 
require 'FileUtils' 

$config = ' 
adapter: postgresql 
database: edgar 
username: YYYYY 
password: 
host: 127.0.0.1' 

ActiveRecord::Base.establish_connection(YAML::load($config)) 
class Doc < ActiveRecord::Base; end 
class Eightk < ActiveRecord::Base; end 



directory = "disease"  #Creates a directory called disease 
FileUtils.mkpath(directory)  # Makes the directory if it doesn't exists 

cancer = Eightk.where("text ilike '%cancer%'") 
death = Eightk.where("text ilike '%death%'") 


cancer.each do |filing|  #filing can be used instead of eightks 
    filename = "#{directory}/#{filing.doc_id}.html" 
    File.open(filename,"w").puts filing.text 
    puts "Storing #{filing.doc_id}..." 


death.each do |filing| #filing can be used instead of eightks 
    filename = "#{directory}/#{filing.doc_id}.html" 
    File.open(filename,"w").puts filing.text 
    puts "Storing #{filing.doc_id}..." 

    end 
end 

我有一長串的條件我想搜索;

1. 有沒有辦法讓我組合搜索列表。我想「癌症」 |「死亡」但沒有任何運氣
2. 我願做一個精確匹配的話，而不是ILIKE但不知道該命令，

感謝

Answer 1

也許類似

keywords = %w(cancer death anotherone) 
records = Eightk.where keywords.map{|w| "(text ILIKE '%#{w}%')"}.join(' OR ') 

records.each do |filing| 
    filename = "#{directory}/#{filing.doc_id}.html" 
    File.open(filename,"w").puts filing.text 
end 

否則，你可以使用「類似於」或「POSIX」 http://www.postgresql.org/docs/8.1/static/functions-matching.html#FUNCTIONS-SIMILARTO-REGEXP那麼你可以使用正則表達式。

如

Eightk.where "text SIMILAR TO '%(#{keywords.join '|' })%'" 

POSIX會允許你這樣做的起點和文字，讓你可以檢查僅在全字匹配的結束檢查（如將匹配,death，death或death.但不deathbed等。

我會離開的正則表達式的東西的人有更大的正則表達式，富:)