Question

我正在尝试通过capistrano进行部署，出于某种原因，我得到了：

/Users/mysite/.rvm/gems/ruby-1.9.2-p318@fbadapter/gems/json-1.4.6/lib/json/common.rb:146:in `initialize': can't convert Hash into String (TypeError)
  from /Users/mysite/.rvm/gems/ruby-1.9.2-p318@fbadapter/gems/json-1.4.6/lib/json/common.rb:146:in `new'
  from /Users/mysite/.rvm/gems/ruby-1.9.2-p318@fbadapter/gems/json-1.4.6/lib/json/common.rb:146:in `parse'
  from /Users/mysite/.rvm/gems/ruby-1.9.2-p318@fbadapter/gems/chef-capistrano-0.1.0/lib/chef/capistrano.rb:27:in `role_from_chef'
  from ./config/deploy.rb:35:in `block in load'

我config/deploy.rb的问题是：

after 'multistage:ensure' do
 role_from_chef :db, 'app', :limit => 1, :primary => true # perform db operations on one of the app servers
 role_from_chef :web, 'app'
 role_from_chef :app
 role_from_chef :queue
 role_from_chef :cron
end

第二行是第35行

更新代码

  def role_from_chef(cap_role, *roles)
    %w(chef_host chef_port chef_scheme chef_client_name chef_key_file).each do |value|
      abort "Please set :#{value}" unless exists?(value.to_sym)
    end

    Spice.setup do |s|
      s.host = fetch(:chef_host)
      s.port = fetch(:chef_port)
      s.scheme = fetch(:chef_scheme)
      s.client_name = fetch(:chef_client_name)
      s.key_file = fetch(:chef_key_file)
    end
    Spice.connect!

    options = roles.extract_options!
    roles = [cap_role.to_s] if roles.empty?
    search_roles = fetch(:chef_search_roles) + roles
    query = search_roles.map{|r| "role:#{r}"}.join(" AND ")

    response = Spice.connection.get("/search/node?q=#{URI.encode(query)}")        
    response_object = JSON.parse(response)
    raise response_object['error'].join(' ') if response_object.has_key?('error')

    nodes = response_object['rows']
    hosts = nodes.select{|n| n['ec2']}.map{|n| n['ec2']['public_hostname']}

    if limit = options.delete(:limit)
      hosts = hosts.slice(0, limit)
    end

    hosts.each do |host|
      node = nodes.detect { |n| n['ec2']['public_hostname'] == host }
      puts "#{cap_role}: #{node['ec2']['instance_id']} - #{node['ec2']['public_hostname']}"
    end

    hosts << options
    role cap_role, *hosts
  end

Answer 1

role_from_chef :db, 'app', :limit => 1, :primary => true

相当于

role_from_chef( :db, 'app', { :limit => 1, :primary => true } )

根据错误，我会说你的函数role_from_chef确实接受一个String作为第三个参数。但是，如果没有粘贴role_from_chef函数，我无法确定。

无论如何你应该调查的是：遵循role_from_chef中的第三个参数，看看它是否在某个地方用作字符串

无法将'哈希'转换为'字符串'

1 个答案: