Question

 Error (E_UNKNOWN) :: Encountered an unexpected error
: Trying to define a collection (external_resource) which already exists.

我正在尝试为现有数据库创建模型。我不是在使用帆。只是水线独立。我有连接设置迁移安全。但是，水线仍在尝试创建一个已存在于我已存在的数据库中的表。如果我使tableName成为一个新名称，它可以正常工作。问题似乎是当我尝试在现有表中使用现有数据然后为其创建水线模型时。

我认为这是一个错误，因为迁移安全永远不应该尝试创建一个表吗？

我使用没有风帆的水线。

Waterline配置如下：

```
models = [];
fs.readdirSync(HOMEDIR + '/lib/models/waterline').forEach(function(file) {
  models.push(require(HOMEDIR + '/lib/models/waterline/' + file));
});

module.exports = {
  init: function(next) {
    models.forEach(function(model) {
      orm.loadCollection(model);
    });

    orm.initialize(config, function(err, models) {
      if (err) throw err;
      global.models = models.collections;
      global.connections = models.connections;
      next();
    });
  }
};


//And this in my config
localhost: {
      migrate: 'safe',
      adapter: 'postgres',
      database: 'intellinote',
      host: 'localhost',
      user: 'postgres',
      password: '',
      port: 5432
    }
```

顺便使用sails-postgresql。 “sails-postgresql”：“^ 0.11.4”，

我的一个假设是我的模型定义与我的postgresql模型完全不匹配。我试过这样做，但也许我错过了一些小事。在水线代码中它检查模型==模式定义？也许如果我知道，我可以找到为什么这是在尝试创建

用户使用3年。数十亿公司的主要生产水平错误：（

提前致谢

更多信息：表格

的sql如下所示

```
DROP TABLE IF EXISTS "intellinotedb"."external_resource";
CREATE TABLE "intellinotedb"."external_resource" (
    "id" int8 NOT NULL DEFAULT nextval('external_resource_id_seq'::regclass),
    "external_id" varchar(2000) NOT NULL COLLATE "default",
    "version_id" varchar(2000) COLLATE "default",
    "url" varchar(5000) COLLATE "default",
    "name" varchar(4000) COLLATE "default",
    "size" int8,
    "creator" varchar(50) NOT NULL COLLATE "default",
    "created_at" timestamp(6) NOT NULL DEFAULT now(),
    "modified_at" timestamp(6) NULL,
    "project_id" int8 NOT NULL,
    "note_id" int8,
    "type" varchar(50) NOT NULL COLLATE "default",
    "is_public" bool NOT NULL DEFAULT false,
    "state" varchar(100) NOT NULL DEFAULT 'ACTIVE'::character varying COLLATE "default",
    "mime_type" text COLLATE "default",
    "internal_type" text COLLATE "default",
    "is_template" bool NOT NULL,
    "has_filled_data" bool NOT NULL
)
WITH (OIDS=FALSE);
ALTER TABLE "intellinotedb"."external_resource" OWNER TO "intellinote";

-- ----------------------------
--  Primary key structure for table external_resource
-- ----------------------------
ALTER TABLE "intellinotedb"."external_resource" ADD PRIMARY KEY ("id") NOT DEFERRABLE INITIALLY IMMEDIATE;

-- ----------------------------
--  Uniques structure for table external_resource
-- ----------------------------
ALTER TABLE "intellinotedb"."external_resource" ADD CONSTRAINT "external_resource_note_id_key" UNIQUE ("note_id") NOT DEFERRABLE INITIALLY IMMEDIATE;

-- ----------------------------
--  Foreign keys structure for table external_resource
-- ----------------------------
ALTER TABLE "intellinotedb"."external_resource" ADD CONSTRAINT "external_resource_note_id_fkey" FOREIGN KEY ("note_id") REFERENCES "intellinotedb"."note" ("id") ON UPDATE NO ACTION ON DELETE CASCADE NOT DEFERRABLE INITIALLY IMMEDIATE;
ALTER TABLE "intellinotedb"."external_resource" ADD CONSTRAINT "external_resource_project_id_fkey" FOREIGN KEY ("project_id") REFERENCES "intellinotedb"."project" ("id") ON UPDATE NO ACTION ON DELETE NO ACTION NOT DEFERRABLE INITIALLY IMMEDIATE;
```

我的模特：

```
Waterline = require('waterline');

module.exports = Waterline.Collection.extend({
  tableName: 'external_resource',
  meta: {
    schemaName: process.env.WATERLINE_SCHEMA || 'intellinotedb'
  },
  connection: process.env.WATERLINE_DB || 'localhost',
  attributes: {
    id: {
      type: 'integer',
      autoIncrement: true,
      primaryKey: true,
      unique: true,
      size: 8
    },
    external_id: {
      type: 'string',
      required: true,
      size: 2000
    },
    version_id: {
      type: 'string',
      size: 2000
    },
    url: {
      type: 'string',
      required: true,
      size: 5000
    },
    name: {
      type: 'string',
      required: true,
      size: 4000
    },
    size: {
      type: 'integer',
      required: true,
      size: 8
    },
    creator: {
      type: 'string',
      required: true,
      size: 50
    },
    createdAt: {
      type: 'datetime',
      columnName: 'created_at'
    },
    updatedAt: {
      type: 'datetime',
      columnName: 'modified_at'
    },
    project_id: {
      type: 'integer',
      required: true
    },
    note_id: {
      type: 'integer',
      required: true,
      size: 8
    },
    type: {
      type: 'string',
      defaultsTo: 'FILE',
      required: true,
      size: 50
    },
    is_public: {
      type: 'boolean',
      defaultsTo: true,
      required: true
    },
    state: {
      type: 'string',
      enum: ['ACTIVE', 'DELETED'],
      defaultsTo: 'ACTIVE',
      required: true,
      size: 100
    },
    mime_type: {
      type: 'string',
      required: true
    },
    internal_type: {
      type: 'string',
      defaultsTo: 'REGULAR',
      required: true
    },
    is_template: {
      type: 'boolean',
      defaultsTo: false,
      required: false
    },
    has_filled_data: {
      type: 'boolean',
      defaultsTo: false,
      required: false
    }
  }
});

```

Answer 1

迁移功能需要在每个模型上，而不是在连接上。根据这个帖子：https://github.com/balderdashy/waterline/issues/1472

Waterline将现有数据库迁移到没有风帆的水线模型

1 个答案: