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我试图在我的 Rails 4 应用程序中实现textacular gem 。基本和高级搜索工作正常，但是当我尝试实现模糊搜索时，我遇到了一些麻烦。

来自存储库的安装说明：

最后，#fuzzy_search 方法允许您使用 Postgres 的三元组搜索功能。

为了使用它，您需要确保您的数据库安装了 pg_trgm 模块。在您的开发机器上，您可以要求 textacular/tasks 并运行

rake textacular:install_trigram

根据您的生产环境，您可能能够使用 rake 任务，或者您可能必须手动运行命令。对于 Postgres 9.1 及更高版本，您需要运行

创建扩展 pg_trgm;

我试过的

我尝试在我的应用程序的根目录中运行rake textacular:install_trigram并收到以下消息：bundle exec rake textacular:install_trigram

/usr/local/Cellar/postgresql/9.2.4/share/postgresql/extension/pg_trgm.control
rake aborted!
PG::InsufficientPrivilege: ERROR:  permission denied to create extension "pg_trgm"
HINT:  Must be superuser to create this extension.
: CREATE EXTENSION pg_trgm;
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/postgresql/database_statements.rb:128:in `exec'
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/postgresql/database_statements.rb:128:in `block in execute'
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract_adapter.rb:425:in `block in log'
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.0.0/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract_adapter.rb:420:in `log'
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/postgresql/database_statements.rb:127:in `execute'
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/gems/textacular-3.1.0/lib/textacular/postgres_module_installer.rb:54:in `install_postgres_91_module'
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/gems/textacular-3.1.0/lib/textacular/postgres_module_installer.rb:7:in `install_module'
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/gems/textacular-3.1.0/lib/textacular/tasks.rb:14:in `block (2 levels) in <top (required)>'
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/bin/ruby_noexec_wrapper:14:in `eval'
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/bin/ruby_noexec_wrapper:14:in `<main>'
Tasks: TOP => textacular:install_trigram

基于此，我尝试sudo rake textacular:install_trigram并得到了这个：

cannot load such file -- bundler/setup
/Users/ssapra/Sameet/Programming/WebDev/Rails/myapp/config/boot.rb:4:in `<top (required)>'
/Users/ssapra/Sameet/Programming/WebDev/Rails/myapp/config/application.rb:1:in `<top (required)>'
/Users/ssapra/Sameet/Programming/WebDev/Rails/myapp/Rakefile:4:in `<top (required)>'
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/bin/ruby_noexec_wrapper:14:in `eval'
/Users/ssapra/.rvm/gems/ruby-2.0.0-p247/bin/ruby_noexec_wrapper:14:in `<main>'
(See full trace by running task with --trace)

最后，在阅读了For Postgres 9.1 and above之后，我尝试运行psql然后CREATE EXTENSION pg_trgm;. 没有错误（尽管我现在做的任何时候，它都会告诉我它已经存在）。所以我\quit然后替换我的有效代码行：

@search = Content.advanced_search(params[:search].split(" ").join("|")).basic_search(params[:search])

和：

@search = Content.fuzzy_search(title: params[:search]).fuzzy_search(text: params[:search])

甚至：

 @search = Content.fuzzy_search(params[:search])

我明白了：

PG::UndefinedFunction: ERROR:  operator does not exist: character varying % unknown
LINE 1: ...NT(*) FROM "contents"  WHERE (("contents"."title" % 'inv')) ...
                                                             ^
HINT:  No operator matches the given name and argument type(s). You might need to add explicit type casts.
: SELECT COUNT(*) FROM "contents"  WHERE (("contents"."title" % 'inv')) AND (("contents"."text" % 'inv'))

它卡在第一行：

-if @contents.empty?
       %p="No results found for: #{@query}"
-elsif !@query.empty?
       %p="Your search results for: #{@query}"

内容控制器

在我的contents_controller.rb: 我有这三个补充：

require 'textacular'
require 'textacular/tasks'
ActiveRecord::Base.extend(Textacular)

我正在运行 Postgres 9.2.4。有任何想法吗？

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