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ruby-on-rails - ActiveRecord::StatementInvalid, PG::UndefinedTable 错误，但生成的 SQL 有效

问题描述

这非常令人沮丧。我试图通过工作获得 has_many，我认为我离这个太近了，看不到一些非常明显的东西。每个步骤都可以正常工作，Rails 生成的 SQL 也可以正常工作，但在控制台中却不是。

整个设置的一个奇怪之处在于 salesforce 模式中有几个表，并且表名和主键不是标准的。这是基本结构：

class Contact
  self.table_name =  'salesforce.contact'
  self.primary_key = 'sfid'

  has_many :content_accesses
  has_many :inventories, through: :content_accesses # I've tried inventory and inventorys, just to ensure it's not Rails magic
end


class ContentAccess
  belongs_to :inventory
  belongs_to :contact
end


class Inventory
  self.table_name =  'salesforce.inventory__c'
  self.primary_key = 'sfid'

  has_many :content_accesses, foreign_key: 'inventory_id'
end

作品：

c = Contact.first
c.content_accesses # works, gives the related items

c.content_accesses.first.inventory # works, gives the related Inventory item

错误：

c.inventories # Gives:

# ActiveRecord::StatementInvalid (PG::UndefinedTable: ERROR:  relation "content_accesses" does not exist)
# LINE 1: ..._c".* FROM "salesforce"."inventory__c" INNER JOIN "content_a...
#                                                          ^
# : SELECT  "salesforce"."inventory__c".* FROM "salesforce"."inventory__c" INNER JOIN "content_accesses" ON "salesforce"."inventory__c"."sfid" = "content_accesses"."inventory_id" WHERE "content_accesses"."contact_id" = $1 LIMIT $2

但是，当我通过Postico运行该查询时，它运行良好。

编辑添加：

表的 DDL：

CREATE TABLE salesforce.inventory__c (
    createddate timestamp without time zone,
    isdeleted boolean,
    name character varying(80),
    systemmodstamp timestamp without time zone,
    inventory_unique_name__c character varying(255),
    sfid character varying(18),
    id integer DEFAULT nextval('salesforce.inventory__c_id_seq'::regclass) PRIMARY KEY,
    _hc_lastop character varying(32),
    _hc_err text
);

CREATE UNIQUE INDEX inventory__c_pkey ON salesforce.inventory__c(id int4_ops);
CREATE INDEX hc_idx_inventory__c_systemmodstamp ON salesforce.inventory__c(systemmodstamp timestamp_ops);
CREATE UNIQUE INDEX hcu_idx_inventory__c_sfid ON salesforce.inventory__c(sfid text_ops);


CREATE TABLE salesforce.contact (
    lastname character varying(80),
    mailingpostalcode character varying(20),
    accountid character varying(18),
    assistantname character varying(40),
    name character varying(121),
    mobilephone character varying(40),
    birthdate date,
    phone character varying(40),
    mailingstreet character varying(255),
    isdeleted boolean,
    assistantphone character varying(40),
    systemmodstamp timestamp without time zone,
    mailingstatecode character varying(10),
    createddate timestamp without time zone,
    mailingcity character varying(40),
    salutation character varying(40),
    title character varying(128),
    mailingcountrycode character varying(10),
    firstname character varying(40),
    email character varying(80),
    sfid character varying(18),
    id integer DEFAULT nextval('salesforce.contact_id_seq'::regclass) PRIMARY KEY,
    _hc_lastop character varying(32),
    _hc_err text
);

CREATE UNIQUE INDEX contact_pkey ON salesforce.contact(id int4_ops);
CREATE INDEX hc_idx_contact_systemmodstamp ON salesforce.contact(systemmodstamp timestamp_ops);
CREATE UNIQUE INDEX hcu_idx_contact_sfid ON salesforce.contact(sfid text_ops);

CREATE TABLE content_accesses (
    id BIGSERIAL PRIMARY KEY,
    inventory_id character varying(20),
    contact_id character varying(20),
    created_at timestamp without time zone NOT NULL,
    updated_at timestamp without time zone NOT NULL
);

CREATE UNIQUE INDEX content_accesses_pkey ON content_accesses(id int8_ops);

编辑 2：作为调试的一部分，我尝试在控制台中运行生成的查询：

感觉就像 Rails 没有弄清楚什么，但我不知道在哪里、为什么或什么。

编辑 3：根据要求，框架跟踪：

activerecord (5.2.0) lib/active_record/connection_adapters/postgresql_adapter.rb:669:in `prepare'
activerecord (5.2.0) lib/active_record/connection_adapters/postgresql_adapter.rb:669:in `block in prepare_statement'
/Users/timsullivan/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/monitor.rb:226:in `mon_synchronize'
activerecord (5.2.0) lib/active_record/connection_adapters/postgresql_adapter.rb:664:in `prepare_statement'
activerecord (5.2.0) lib/active_record/connection_adapters/postgresql_adapter.rb:609:in `exec_cache'
activerecord (5.2.0) lib/active_record/connection_adapters/postgresql_adapter.rb:592:in `execute_and_clear'
activerecord (5.2.0) lib/active_record/connection_adapters/postgresql/database_statements.rb:81:in `exec_query'
activerecord (5.2.0) lib/active_record/connection_adapters/abstract/database_statements.rb:469:in `select_prepared'
activerecord (5.2.0) lib/active_record/connection_adapters/abstract/database_statements.rb:55:in `select_all'
activerecord (5.2.0) lib/active_record/connection_adapters/abstract/query_cache.rb:101:in `select_all'
activerecord (5.2.0) lib/active_record/querying.rb:41:in `find_by_sql'
activerecord (5.2.0) lib/active_record/relation.rb:554:in `block in exec_queries'
activerecord (5.2.0) lib/active_record/relation.rb:578:in `skip_query_cache_if_necessary'
activerecord (5.2.0) lib/active_record/relation.rb:542:in `exec_queries'
activerecord (5.2.0) lib/active_record/association_relation.rb:34:in `exec_queries'
activerecord (5.2.0) lib/active_record/relation.rb:414:in `load'
activerecord (5.2.0) lib/active_record/relation.rb:200:in `records'
activerecord (5.2.0) lib/active_record/relation.rb:195:in `to_ary'
activerecord (5.2.0) lib/active_record/relation/finder_methods.rb:530:in `find_nth_with_limit'
activerecord (5.2.0) lib/active_record/associations/collection_proxy.rb:1136:in `find_nth_with_limit'
activerecord (5.2.0) lib/active_record/relation/finder_methods.rb:515:in `find_nth'
activerecord (5.2.0) lib/active_record/relation/finder_methods.rb:125:in `first'
actionview (5.2.0) lib/action_view/template.rb:159:in `block in render'
activesupport (5.2.0) lib/active_support/notifications.rb:170:in `instrument'
actionview (5.2.0) lib/action_view/template.rb:354:in `instrument_render_template'
actionview (5.2.0) lib/action_view/template.rb:157:in `render'
actionview (5.2.0) lib/action_view/renderer/template_renderer.rb:54:in `block (2 levels) in render_template'
actionview (5.2.0) lib/action_view/renderer/abstract_renderer.rb:44:in `block in instrument'
activesupport (5.2.0) lib/active_support/notifications.rb:168:in `block in instrument'
activesupport (5.2.0) lib/active_support/notifications/instrumenter.rb:23:in `instrument'
activesupport (5.2.0) lib/active_support/notifications.rb:168:in `instrument'
actionview (5.2.0) lib/action_view/renderer/abstract_renderer.rb:43:in `instrument'
actionview (5.2.0) lib/action_view/renderer/template_renderer.rb:53:in `block in render_template'
actionview (5.2.0) lib/action_view/renderer/template_renderer.rb:61:in `render_with_layout'
actionview (5.2.0) lib/action_view/renderer/template_renderer.rb:52:in `render_template'
actionview (5.2.0) lib/action_view/renderer/template_renderer.rb:16:in `render'
actionview (5.2.0) lib/action_view/renderer/renderer.rb:44:in `render_template'
actionview (5.2.0) lib/action_view/renderer/renderer.rb:25:in `render'
actionview (5.2.0) lib/action_view/rendering.rb:103:in `_render_template'
actionpack (5.2.0) lib/action_controller/metal/streaming.rb:219:in `_render_template'
actionview (5.2.0) lib/action_view/rendering.rb:84:in `render_to_body'
actionpack (5.2.0) lib/action_controller/metal/rendering.rb:52:in `render_to_body'
actionpack (5.2.0) lib/action_controller/metal/renderers.rb:142:in `render_to_body'
actionpack (5.2.0) lib/abstract_controller/rendering.rb:25:in `render'
actionpack (5.2.0) lib/action_controller/metal/rendering.rb:36:in `render'
actionpack (5.2.0) lib/action_controller/metal/instrumentation.rb:46:in `block (2 levels) in render'
activesupport (5.2.0) lib/active_support/core_ext/benchmark.rb:14:in `block in ms'
/Users/timsullivan/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/benchmark.rb:308:in `realtime'
activesupport (5.2.0) lib/active_support/core_ext/benchmark.rb:14:in `ms'
actionpack (5.2.0) lib/action_controller/metal/instrumentation.rb:46:in `block in render'
actionpack (5.2.0) lib/action_controller/metal/instrumentation.rb:87:in `cleanup_view_runtime'
activerecord (5.2.0) lib/active_record/railties/controller_runtime.rb:31:in `cleanup_view_runtime'
actionpack (5.2.0) lib/action_controller/metal/instrumentation.rb:45:in `render'
actionpack (5.2.0) lib/action_controller/metal/implicit_render.rb:35:in `default_render'
actionpack (5.2.0) lib/action_controller/metal/basic_implicit_render.rb:6:in `block in send_action'
actionpack (5.2.0) lib/action_controller/metal/basic_implicit_render.rb:6:in `tap'
actionpack (5.2.0) lib/action_controller/metal/basic_implicit_render.rb:6:in `send_action'
actionpack (5.2.0) lib/abstract_controller/base.rb:194:in `process_action'
actionpack (5.2.0) lib/action_controller/metal/rendering.rb:30:in `process_action'
actionpack (5.2.0) lib/abstract_controller/callbacks.rb:42:in `block in process_action'
activesupport (5.2.0) lib/active_support/callbacks.rb:132:in `run_callbacks'
actionpack (5.2.0) lib/abstract_controller/callbacks.rb:41:in `process_action'
actionpack (5.2.0) lib/action_controller/metal/rescue.rb:22:in `process_action'
actionpack (5.2.0) lib/action_controller/metal/instrumentation.rb:34:in `block in process_action'
activesupport (5.2.0) lib/active_support/notifications.rb:168:in `block in instrument'
activesupport (5.2.0) lib/active_support/notifications/instrumenter.rb:23:in `instrument'
activesupport (5.2.0) lib/active_support/notifications.rb:168:in `instrument'
actionpack (5.2.0) lib/action_controller/metal/instrumentation.rb:32:in `process_action'
actionpack (5.2.0) lib/action_controller/metal/params_wrapper.rb:256:in `process_action'
activerecord (5.2.0) lib/active_record/railties/controller_runtime.rb:24:in `process_action'
actionpack (5.2.0) lib/abstract_controller/base.rb:134:in `process'
actionview (5.2.0) lib/action_view/rendering.rb:32:in `process'
actionpack (5.2.0) lib/action_controller/metal.rb:191:in `dispatch'
actionpack (5.2.0) lib/action_controller/metal.rb:252:in `dispatch'
actionpack (5.2.0) lib/action_dispatch/routing/route_set.rb:52:in `dispatch'
actionpack (5.2.0) lib/action_dispatch/routing/route_set.rb:34:in `serve'
actionpack (5.2.0) lib/action_dispatch/journey/router.rb:52:in `block in serve'
actionpack (5.2.0) lib/action_dispatch/journey/router.rb:35:in `each'
actionpack (5.2.0) lib/action_dispatch/journey/router.rb:35:in `serve'
actionpack (5.2.0) lib/action_dispatch/routing/route_set.rb:840:in `call'
warden (1.2.7) lib/warden/manager.rb:36:in `block in call'
warden (1.2.7) lib/warden/manager.rb:35:in `catch'
warden (1.2.7) lib/warden/manager.rb:35:in `call'
rack (2.0.5) lib/rack/tempfile_reaper.rb:15:in `call'
rack (2.0.5) lib/rack/etag.rb:25:in `call'
rack (2.0.5) lib/rack/conditional_get.rb:25:in `call'
rack (2.0.5) lib/rack/head.rb:12:in `call'
actionpack (5.2.0) lib/action_dispatch/http/content_security_policy.rb:18:in `call'
rack (2.0.5) lib/rack/session/abstract/id.rb:232:in `context'
rack (2.0.5) lib/rack/session/abstract/id.rb:226:in `call'
actionpack (5.2.0) lib/action_dispatch/middleware/cookies.rb:670:in `call'
activerecord (5.2.0) lib/active_record/migration.rb:559:in `call'
actionpack (5.2.0) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (5.2.0) lib/active_support/callbacks.rb:98:in `run_callbacks'
actionpack (5.2.0) lib/action_dispatch/middleware/callbacks.rb:26:in `call'
actionpack (5.2.0) lib/action_dispatch/middleware/executor.rb:14:in `call'
airbrake (7.2.1) lib/airbrake/rack/middleware.rb:52:in `call'
actionpack (5.2.0) lib/action_dispatch/middleware/debug_exceptions.rb:61:in `call'
web-console (3.6.1) lib/web_console/middleware.rb:135:in `call_app'
web-console (3.6.1) lib/web_console/middleware.rb:30:in `block in call'
web-console (3.6.1) lib/web_console/middleware.rb:20:in `catch'
web-console (3.6.1) lib/web_console/middleware.rb:20:in `call'
actionpack (5.2.0) lib/action_dispatch/middleware/show_exceptions.rb:33:in `call'
railties (5.2.0) lib/rails/rack/logger.rb:38:in `call_app'
railties (5.2.0) lib/rails/rack/logger.rb:26:in `block in call'
activesupport (5.2.0) lib/active_support/tagged_logging.rb:71:in `block in tagged'
activesupport (5.2.0) lib/active_support/tagged_logging.rb:28:in `tagged'
activesupport (5.2.0) lib/active_support/tagged_logging.rb:71:in `tagged'
railties (5.2.0) lib/rails/rack/logger.rb:26:in `call'
sprockets-rails (3.2.1) lib/sprockets/rails/quiet_assets.rb:13:in `call'
actionpack (5.2.0) lib/action_dispatch/middleware/remote_ip.rb:81:in `call'
actionpack (5.2.0) lib/action_dispatch/middleware/request_id.rb:27:in `call'
rack (2.0.5) lib/rack/method_override.rb:22:in `call'
rack (2.0.5) lib/rack/runtime.rb:22:in `call'
activesupport (5.2.0) lib/active_support/cache/strategy/local_cache_middleware.rb:29:in `call'
actionpack (5.2.0) lib/action_dispatch/middleware/executor.rb:14:in `call'
actionpack (5.2.0) lib/action_dispatch/middleware/static.rb:127:in `call'
rack (2.0.5) lib/rack/sendfile.rb:111:in `call'
webpacker (3.4.3) lib/webpacker/dev_server_proxy.rb:18:in `perform_request'
rack-proxy (0.6.4) lib/rack/proxy.rb:57:in `call'
railties (5.2.0) lib/rails/engine.rb:524:in `call'
puma (3.11.4) lib/puma/configuration.rb:225:in `call'
puma (3.11.4) lib/puma/server.rb:632:in `handle_request'
puma (3.11.4) lib/puma/server.rb:446:in `process_client'
puma (3.11.4) lib/puma/server.rb:306:in `block in run'
puma (3.11.4) lib/puma/thread_pool.rb:120:in `block in spawn_thread'

标签： ruby-on-railspostgresql

解决方案

既然你说，当你直接调用它时，生成的 SQL 就可以工作，问题根源在于将返回的数据映射回对象的过程中的某个地方。尽管您的设置看起来不错，但它似乎很不标准，所以我会尝试给 rails 更多关于关联如何归属的提示。

首先，您应该source为您的through关系（文档）设置一个：

has_many :inventories, through: :content_accesses, source: :inventory

如果这仍然没有给 rails 提供正确的线索，您可以尝试设置inverse_of, foreign_key，primary_key甚至class_name在另一个belongs_to和has_many关联上，为 rails 提供所需的提示。很难说出什么可能有帮助，但在非标准设置中，您有时会遇到自动推断名称的某些问题。

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