先前信息：我对Ruby on Rails及其Gems和Frameworks知之甚少。所以看起来很明显的事情对我来说可能并非如此。
我需要在前端包含sqlite3的应用中将数据库从postgreSQL迁移到AngularJS，并在后端使用Ruby on Rails ActiveRecord。< / p>
我安装了Ruby Gem pg并更改了database.yml，如下所示：
# This was for sqlite
#adapter: sqlite3
#database: db/gfms.sqlite3
#pool: 5
#timeout: 5000
# This is for postgreSQL
adapter: postgresql
encoding: unicode
database: llqa
pool: 5
username: postgres
password: admin
host: localhost
port: 1234
timeout: 5000
schema_search_path: "gfms"
我现在有几个问题。有些查询不会返回任何记录，但不会生成错误。但是：
我遇到的一个更具体的问题是这个错误：
E, [2017-04-21T07:34:30.381466 #10961] ERROR -- : PG::SyntaxError: ERROR: zero-length delimited identifier at or near """"
LINE 1: ..."configtables" WHERE (parent IS NULL OR parent = "" OR pare...
^
: SELECT COUNT(*) FROM "configtables" WHERE (parent IS NULL OR parent = "" OR parent = 'model')
2017-04-21 07:34:30 - ActiveRecord::StatementInvalid - PG::SyntaxError: ERROR: zero-length delimited identifier at or near """"
LINE 1: ..."configtables" WHERE (parent IS NULL OR parent = "" OR pare...
^
: SELECT COUNT(*) FROM "configtables" WHERE (parent IS NULL OR parent = "" OR parent = 'model'):
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.16/lib/active_record/connection_adapters/postgresql_adapter.rb:822:in `async_exec'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.16/lib/active_record/connection_adapters/postgresql_adapter.rb:822:in `block in exec_no_cache'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.16/lib/active_record/connection_adapters/abstract_adapter.rb:378:in `block in log'
/Library/Ruby/Gems/2.0.0/gems/activesupport-4.1.16/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.16/lib/active_record/connection_adapters/abstract_adapter.rb:372:in `log'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.16/lib/active_record/connection_adapters/postgresql_adapter.rb:822:in `exec_no_cache'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.16/lib/active_record/connection_adapters/postgresql/database_statements.rb:137:in `exec_query'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.16/lib/active_record/connection_adapters/postgresql_adapter.rb:954:in `select'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.16/lib/active_record/connection_adapters/abstract/database_statements.rb:24:in `select_all'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.16/lib/active_record/connection_adapters/abstract/query_cache.rb:70:in `select_all'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.16/lib/active_record/relation/calculations.rb:265:in `execute_simple_calculation'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.16/lib/active_record/relation/calculations.rb:227:in `perform_calculation'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.16/lib/active_record/relation/calculations.rb:119:in `calculate'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.16/lib/active_record/relation/calculations.rb:34:in `count'
/Users/ndinatale/leanlogic-qa-prototype/server/lib/models_base.rb:135:in `get_list'
/Users/ndinatale/leanlogic-qa-prototype/server/routes/02_rest_misc.rb:266:in `block in <top (required)>'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1611:in `call'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1611:in `block in compile!'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:975:in `[]'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:975:in `block (3 levels) in route!'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:994:in `route_eval'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:975:in `block (2 levels) in route!'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1015:in `block in process_route'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1013:in `catch'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1013:in `process_route'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:973:in `block in route!'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:972:in `each'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:972:in `route!'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1085:in `block in dispatch!'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1067:in `block in invoke'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1067:in `catch'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1067:in `invoke'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1082:in `dispatch!'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:907:in `block in call!'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1067:in `block in invoke'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1067:in `catch'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1067:in `invoke'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:907:in `call!'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:895:in `call'
/Library/Ruby/Gems/2.0.0/gems/rack-1.6.5/lib/rack/session/abstract/id.rb:225:in `context'
/Library/Ruby/Gems/2.0.0/gems/rack-1.6.5/lib/rack/session/abstract/id.rb:220:in `call'
/Library/Ruby/Gems/2.0.0/gems/rack-protection-1.5.3/lib/rack/protection/xss_header.rb:18:in `call'
/Library/Ruby/Gems/2.0.0/gems/rack-protection-1.5.3/lib/rack/protection/path_traversal.rb:16:in `call'
/Library/Ruby/Gems/2.0.0/gems/rack-protection-1.5.3/lib/rack/protection/json_csrf.rb:18:in `call'
/Library/Ruby/Gems/2.0.0/gems/rack-protection-1.5.3/lib/rack/protection/base.rb:49:in `call'
/Library/Ruby/Gems/2.0.0/gems/rack-protection-1.5.3/lib/rack/protection/base.rb:49:in `call'
/Library/Ruby/Gems/2.0.0/gems/rack-protection-1.5.3/lib/rack/protection/frame_options.rb:31:in `call'
/Library/Ruby/Gems/2.0.0/gems/rack-1.6.5/lib/rack/nulllogger.rb:9:in `call'
/Library/Ruby/Gems/2.0.0/gems/rack-1.6.5/lib/rack/head.rb:13:in `call'
/Library/Ruby/Gems/2.0.0/gems/rack-1.6.5/lib/rack/methodoverride.rb:22:in `call'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/show_exceptions.rb:25:in `call'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:182:in `call'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:2013:in `call'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1487:in `block in call'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1785:in `synchronize'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1785:in `synchronize'
/Library/Ruby/Gems/2.0.0/gems/sinatra-1.4.8/lib/sinatra/base.rb:1487:in `call'
/Library/Ruby/Gems/2.0.0/gems/puma-3.8.2/lib/puma/configuration.rb:224:in `call'
/Library/Ruby/Gems/2.0.0/gems/puma-3.8.2/lib/puma/server.rb:600:in `handle_request'
/Library/Ruby/Gems/2.0.0/gems/puma-3.8.2/lib/puma/server.rb:435:in `process_client'
/Library/Ruby/Gems/2.0.0/gems/puma-3.8.2/lib/puma/server.rb:299:in `block in run'
/Library/Ruby/Gems/2.0.0/gems/puma-3.8.2/lib/puma/thread_pool.rb:120:in `call'
/Library/Ruby/Gems/2.0.0/gems/puma-3.8.2/lib/puma/thread_pool.rb:120:in `block in spawn_thread'
发生错误的函数（注释行）：
def get_list(limit = nil, page = nil)
coll = all
coll = (block_given?) ? (yield coll) : coll
rowcnt = coll.count # This is the line where the error happens
pages = (limit && limit > 0) ? (rowcnt.to_f/limit).ceil : 1
coll = coll.limit(limit) if limit && limit > 0
coll = coll.offset((page-1)*limit) if limit && limit > 0 && page && page > 1
ret = { rows: coll.all.to_a, rowcnt: rowcnt, page: page || 1, pages: pages, limit: limit || 0 }
def ret.serialize(include = nil)
self[:rows].collect! do |row|
hash = include ? (row.serializable_hash(include: include.incllist)) : row.serializable_hash
(hash['code'] && hash['code'].end_with?('(TR)')) ? nil : ((block_given?) ? yield(hash,row) : hash)
end
self[:rows].compact!
return self.rest_success,true,self
end
return ret
end
这只是一个例子。我的问题是：ActiveRecord，Ruby或postgreSQL配置中是否存在某些内容，因此它与sqlite3的行为相同？如果有什么需要做什么？