很难表达的问题,但这里有。最终,我在 RethinkDB 中有一组模型,它们以某种链模式相互关联。当我想使用定义为“hasMany”关系的字段时遇到问题,使用 Thinky ORM,将 rethinkdb 模型数组放入以保存到数据库并创建与对象的关系。
由于这在段落中解释起来非常困难且冗长,因此我创建了一个独立的测试用例来用代码说明我面临的问题。
var Reqlite = require('reqlite');
var assert = require('assert');
var thinky = require('thinky')({
"host": "localhost",
"port": 28016,
"db": "test"
});
var server = new Reqlite({"driver-port": 28016});
var r = thinky.r;
var type = thinky.type;
// Models
var Account = thinky.createModel('accounts', {
id: type.string(),
username: type.string(),
});
var User = thinky.createModel('users', {
id: type.string(),
name: type.string(),
accountId: type.string(),
archetypeId: type.string(),
});
var Archetype = thinky.createModel('archetypes', {
id: type.string(),
name: type.string(),
});
var Node = thinky.createModel('nodes', {
id: type.string(),
skillId: type.string(),
archetypeId: type.string(),
});
var Skill = thinky.createModel('skills', {
id: type.string(),
name: type.string(),
desc: type.string(),
});
// Relationships
// Account <--> User
Account.hasMany(User, 'users', 'id', 'accountId');
User.belongsTo(Account, 'owner', 'accountId', 'id');
// User <--> Archetype
User.belongsTo(Archetype, 'archetype', 'archetypeId', 'id');
// Archetype <--> Node
Archetype.hasMany(Node, 'nodes', 'id', 'archetypeId');
Node.belongsTo(Archetype, 'archetype', 'archetypeId', 'id');
// Node <--> Skill
Node.belongsTo(Skill, 'skill', 'skillId', 'id');
Skill.hasMany(Node, 'nodes', 'id', 'skillId');
before(function(done) {
var skillDebugging = Skill({
id: '100',
name: 'Debugging',
desc: 'Increase knowledge of the inner working of things',
});
var skillBuilding = Skill({
id: '110',
name: 'Building',
desc: 'Survive the Apocalypse with this',
});
var debuggerNode = Node({
id: '200',
skill: skillDebugging,
});
var builderNode = Node({
id: '210',
skill: skillBuilding,
});
var jackBuildNode = Node({
id: '220',
skill: skillBuilding,
});
var jackDebugNode = Node({
id: '230',
skill: skillDebugging,
});
var archetype1 = Archetype({
id: '300',
name: 'Debugger',
nodes: [debuggerNode],
});
var archetype2 = Archetype({
id: '310',
name: 'Builder',
nodes: [builderNode],
});
var archetype3 = Archetype({
id: '320',
name: 'Jack-O-Trades',
nodes: [jackBuildNode, jackDebugNode],
});
archetype1.saveAll().then(function(result) {
archetype2.saveAll().then(function(result1) {
archetype3.saveAll().then(function(result2) {
done();
}).error(done).catch(done);
}).error(done).catch(done);
}).error(done).catch(done);
});
describe('New Test', function() {
it('should return a list of archetypes with all joined nodes and skills', function(done) {
Archetype.getJoin().then(function(archetypes) {
// here we should expect to see the data saved and joined in each archetype as it was defined
// above in the "before" block
console.info('\nList of archetypes: ', JSON.stringify(archetypes));
assert.ok(archetypes);
archetypes.forEach(function(archetype) {
assert.ok(archetype);
assert.ok(archetype.nodes);
archetype.nodes.forEach(function(node) {
assert.ok(node);
assert.ok(node.skill);
});
});
done();
}).error(done).catch(done);
});
it('should return a skill with a list of nodes joined', function(done) {
Skill.get('100').getJoin().then(function(debugSkill) {
console.info('\nDebug skill JSON: ', JSON.stringify(debugSkill));
// if successful, we should see two nodes associated with this skill
assert.ok(debugSkill);
assert.ok(debugSkill.nodes);
assert.ok(debugSkill.nodes.length > 1);
done();
}).error(done).catch(done);
});
});
这是一个使用 Reqlite 模拟 RethinkDB 数据库的测试用例,thinky 作为 ORM,mocha 作为运行测试的测试套件。在代码示例中,最后一个原型id: '320'
和 nameJack-O-Trades
是遇到问题的原型,而其他两个原型构建得很好。问题是,只有jackBuildNode
它与skill
模型的正确关联被保存。数组中的第二个节点jackDebugNode
在数据库中保存并创建,但不保存该节点与技能模型应具有的关系。nodes
Jack-O-Trades
skillDebugging
谁能看到我在这里的代码和/或逻辑中可能出错的地方?我确实知道有一些方法可以通过模块化保存并仅更新关系后记来解决此问题,但是让单个 saveAll() 操作负责关联和创建此数据会更安全,因为单个操作更有可能在没有损坏的情况下成功,因为将其分成多个保存/更新调用会产生不完整的保存/更新的可能性。任何见解将不胜感激。