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require",[1632,1709,1710],{"class":1700},"(",[1632,1712,1713],{"class":1646},"'",[1632,1715,1716],{"class":1642},"mongoose",[1632,1718,1713],{"class":1646},[1632,1720,1721],{"class":1700},")",[1632,1723,1724],{"class":1646},";\n",[1632,1726,1727],{"class":1634,"line":1657},[1632,1728,1730],{"emptyLinePlaceholder":1729},true,"\n",[1632,1732,1733,1736,1739,1742,1745],{"class":1634,"line":1669},[1632,1734,1735],{"class":1696},"async",[1632,1737,1738],{"class":1696}," function",[1632,1740,1741],{"class":1650}," connect",[1632,1743,1744],{"class":1646},"()",[1632,1746,1747],{"class":1646}," {\n",[1632,1749,1751,1755,1758,1761,1764],{"class":1634,"line":1750},4,[1632,1752,1754],{"class":1753},"s8pZq","    await",[1632,1756,1757],{"class":1700}," mongoose",[1632,1759,1760],{"class":1646},".",[1632,1762,1763],{"class":1650},"connect",[1632,1765,1767],{"class":1766},"sd2Uz","(\n",[1632,1769,1771,1774,1777],{"class":1634,"line":1770},5,[1632,1772,1773],{"class":1646},"        '",[1632,1775,1776],{"class":1642},"mongodb://root:123456@localhost:27017/blog_demo?authSource=admin",[1632,1778,1779],{"class":1646},"'\n",[1632,1781,1783,1786],{"class":1634,"line":1782},6,[1632,1784,1785],{"class":1766},"    )",[1632,1787,1724],{"class":1646},[1632,1789,1791,1794,1796,1799,1801,1803,1806,1808,1810],{"class":1634,"line":1790},7,[1632,1792,1793],{"class":1700},"    console",[1632,1795,1760],{"class":1646},[1632,1797,1798],{"class":1650},"log",[1632,1800,1710],{"class":1766},[1632,1802,1713],{"class":1646},[1632,1804,1805],{"class":1642},"MongoDB 连接成功",[1632,1807,1713],{"class":1646},[1632,1809,1721],{"class":1766},[1632,1811,1724],{"class":1646},[1632,1813,1815],{"class":1634,"line":1814},8,[1632,1816,1817],{"class":1646},"}\n",[1632,1819,1821],{"class":1634,"line":1820},9,[1632,1822,1730],{"emptyLinePlaceholder":1729},[1632,1824,1826,1829,1832,1834],{"class":1634,"line":1825},10,[1632,1827,1828],{"class":1646},"module.exports",[1632,1830,1831],{"class":1646}," =",[1632,1833,1741],{"class":1700},[1632,1835,1724],{"class":1646},[1531,1837,1838],{},"连接串里有三个点要注意：",[1840,1841,1842,1849,1859],"ul",{},[1843,1844,1845,1848],"li",{},[1556,1846,1847],{},"localhost:27017"," 是 Docker 容器映射出来的地址和端口。",[1843,1850,1851,1854,1855,1858],{},[1556,1852,1853],{},"/blog_demo"," 是",[1538,1856,1857],{},"直接写在连接串里的数据库名","，连接成功后默认操作的就是它，不存在再创建。",[1843,1860,1861,1864,1865,1868],{},[1556,1862,1863],{},"?authSource=admin"," 表示去 ",[1556,1866,1867],{},"admin"," 数据库校验账号密码。因为 root 账号是在 admin 库里创建的，少了这个参数会认证失败，这是新手连接带密码的 MongoDB 时常见的坑。",[1546,1870],{},[1526,1872,1874],{"id":1873},"定义-schema-和-model","✨ 定义 Schema 和 Model",[1531,1876,1877,1878,1881,1882,1885],{},"Mongoose 的两个核心概念是 ",[1538,1879,1880],{},"Schema"," 和 ",[1538,1883,1884],{},"Model","：",[1840,1887,1888,1894],{},[1843,1889,1890,1893],{},[1538,1891,1892],{},"Schema（模式）","：描述集合里文档的结构，相当于前面说的「登记表的表头」。",[1843,1895,1896,1899],{},[1538,1897,1898],{},"Model（模型）","：由 Schema 生成的操作入口，增删改查都通过它来完成。",[1531,1901,1902,1903,1905],{},"我们为 ",[1556,1904,1558],{}," 集合定义一个 Schema：",[1623,1907,1910],{"className":1687,"code":1908,"filename":1909,"language":1689,"meta":1628,"style":1628},"const mongoose = require('mongoose');\n\nconst userSchema = new mongoose.Schema({\n    username: { type: String, required: true },\n    age: { type: Number, min: 0, max: 150 },\n    city: { type: String, default: '未知' },\n});\n\nconst User = mongoose.model('User', userSchema);\n\nmodule.exports = User;\n","user.js",[1556,1911,1912,1934,1938,1961,1995,2034,2066,2075,2079,2111,2115],{"__ignoreMap":1628},[1632,1913,1914,1916,1918,1920,1922,1924,1926,1928,1930,1932],{"class":1634,"line":1635},[1632,1915,1697],{"class":1696},[1632,1917,1701],{"class":1700},[1632,1919,1704],{"class":1646},[1632,1921,1707],{"class":1650},[1632,1923,1710],{"class":1700},[1632,1925,1713],{"class":1646},[1632,1927,1716],{"class":1642},[1632,1929,1713],{"class":1646},[1632,1931,1721],{"class":1700},[1632,1933,1724],{"class":1646},[1632,1935,1936],{"class":1634,"line":1657},[1632,1937,1730],{"emptyLinePlaceholder":1729},[1632,1939,1940,1942,1945,1947,1950,1952,1954,1956,1958],{"class":1634,"line":1669},[1632,1941,1697],{"class":1696},[1632,1943,1944],{"class":1700}," userSchema ",[1632,1946,1704],{"class":1646},[1632,1948,1949],{"class":1646}," new",[1632,1951,1757],{"class":1700},[1632,1953,1760],{"class":1646},[1632,1955,1880],{"class":1650},[1632,1957,1710],{"class":1700},[1632,1959,1960],{"class":1646},"{\n",[1632,1962,1963,1966,1969,1972,1975,1977,1980,1983,1986,1988,1992],{"class":1634,"line":1750},[1632,1964,1965],{"class":1766},"    username",[1632,1967,1968],{"class":1646},":",[1632,1970,1971],{"class":1646}," {",[1632,1973,1974],{"class":1766}," type",[1632,1976,1968],{"class":1646},[1632,1978,1979],{"class":1700}," String",[1632,1981,1982],{"class":1646},",",[1632,1984,1985],{"class":1766}," required",[1632,1987,1968],{"class":1646},[1632,1989,1991],{"class":1990},"sPKOg"," true",[1632,1993,1994],{"class":1646}," },\n",[1632,1996,1997,2000,2002,2004,2006,2008,2011,2013,2016,2018,2022,2024,2027,2029,2032],{"class":1634,"line":1770},[1632,1998,1999],{"class":1766},"    age",[1632,2001,1968],{"class":1646},[1632,2003,1971],{"class":1646},[1632,2005,1974],{"class":1766},[1632,2007,1968],{"class":1646},[1632,2009,2010],{"class":1700}," Number",[1632,2012,1982],{"class":1646},[1632,2014,2015],{"class":1766}," min",[1632,2017,1968],{"class":1646},[1632,2019,2021],{"class":2020},"smPcV"," 0",[1632,2023,1982],{"class":1646},[1632,2025,2026],{"class":1766}," max",[1632,2028,1968],{"class":1646},[1632,2030,2031],{"class":2020}," 150",[1632,2033,1994],{"class":1646},[1632,2035,2036,2039,2041,2043,2045,2047,2049,2051,2054,2056,2059,2062,2064],{"class":1634,"line":1782},[1632,2037,2038],{"class":1766},"    city",[1632,2040,1968],{"class":1646},[1632,2042,1971],{"class":1646},[1632,2044,1974],{"class":1766},[1632,2046,1968],{"class":1646},[1632,2048,1979],{"class":1700},[1632,2050,1982],{"class":1646},[1632,2052,2053],{"class":1766}," default",[1632,2055,1968],{"class":1646},[1632,2057,2058],{"class":1646}," '",[1632,2060,2061],{"class":1642},"未知",[1632,2063,1713],{"class":1646},[1632,2065,1994],{"class":1646},[1632,2067,2068,2071,2073],{"class":1634,"line":1790},[1632,2069,2070],{"class":1646},"}",[1632,2072,1721],{"class":1700},[1632,2074,1724],{"class":1646},[1632,2076,2077],{"class":1634,"line":1814},[1632,2078,1730],{"emptyLinePlaceholder":1729},[1632,2080,2081,2083,2086,2088,2090,2092,2095,2097,2099,2102,2104,2106,2109],{"class":1634,"line":1820},[1632,2082,1697],{"class":1696},[1632,2084,2085],{"class":1700}," User ",[1632,2087,1704],{"class":1646},[1632,2089,1757],{"class":1700},[1632,2091,1760],{"class":1646},[1632,2093,2094],{"class":1650},"model",[1632,2096,1710],{"class":1700},[1632,2098,1713],{"class":1646},[1632,2100,2101],{"class":1642},"User",[1632,2103,1713],{"class":1646},[1632,2105,1982],{"class":1646},[1632,2107,2108],{"class":1700}," userSchema)",[1632,2110,1724],{"class":1646},[1632,2112,2113],{"class":1634,"line":1825},[1632,2114,1730],{"emptyLinePlaceholder":1729},[1632,2116,2118,2120,2122,2125],{"class":1634,"line":2117},11,[1632,2119,1828],{"class":1646},[1632,2121,1831],{"class":1646},[1632,2123,2124],{"class":1700}," User",[1632,2126,1724],{"class":1646},[1531,2128,2129],{},"逐个字段来看：",[1840,2131,2132,2141,2154],{},[1843,2133,2134,2136,2137,2140],{},[1556,2135,1562],{},"：字符串类型，",[1556,2138,2139],{},"required: true"," 表示必填，不写就报错。",[1843,2142,2143,2146,2147,1881,2150,2153],{},[1556,2144,2145],{},"age","：数字类型，",[1556,2148,2149],{},"min",[1556,2151,2152],{},"max"," 限制取值范围在 0 到 150 之间。",[1843,2155,2156,2136,2159,2162],{},[1556,2157,2158],{},"city",[1556,2160,2161],{},"default: '未知'"," 表示不传时自动填「未知」。",[1531,2164,2165,2168,2169,2171,2172,2175,2176,2179,2180,2183],{},[1556,2166,2167],{},"mongoose.model('User', userSchema)"," 生成了 ",[1556,2170,2101],{}," 这个模型。注意首个参数 ",[1556,2173,2174],{},"'User'"," 是模型名，Mongoose 会自动把它转成",[1538,2177,2178],{},"小写复数","去对应集合，也就是操作 ",[1556,2181,2182],{},"users"," 集合。这是它的约定，不用手动指定。",[1610,2185,2186],{},[1531,2187,2188,2189,2191,2192,2194,2195,2197,2198,2201],{},"如果你前面几篇用的是 ",[1556,2190,1558],{}," 集合，注意 Mongoose 默认找的是 ",[1556,2193,2182],{},"。想让它继续用 ",[1556,2196,1558],{},"，可以显式传入第三个参数：",[1556,2199,2200],{},"mongoose.model('User', userSchema, 'user')","。",[1546,2203],{},[1526,2205,2207],{"id":2206},"用-model-完成增删改查","💡 用 Model 完成增删改查",[1531,2209,2210],{},"有了 Model，增删改查都变得非常直白，方法名基本见名知意：",[1623,2212,2215],{"className":1687,"code":2213,"filename":2214,"language":1689,"meta":1628,"style":1628},"const connect = require('./db');\nconst User = require('./user');\n\nasync function main() {\n    await connect();\n\n    // 新增\n    const user = await User.create({ username: '小明', age: 20, city: '北京' });\n    console.log('新增成功：', user);\n\n    // 查询全部\n    const users = await User.find();\n    console.log('用户列表：', users);\n\n    // 按 id 查询单个用户\n    const found = await User.findById(user._id);\n    console.log('按 id 查询：', found);\n\n    // 更新\n    await User.updateOne({ _id: user._id }, { age: 26 });\n\n    // 删除\n    await User.deleteOne({ _id: user._id });\n\n    process.exit(0);\n}\n\nmain();\n","crud.js",[1556,2216,2217,2241,2264,2268,2281,2291,2295,2301,2369,2394,2398,2403,2426,2452,2457,2463,2495,2521,2526,2532,2577,2582,2588,2620,2625,2645,2650,2655],{"__ignoreMap":1628},[1632,2218,2219,2221,2224,2226,2228,2230,2232,2235,2237,2239],{"class":1634,"line":1635},[1632,2220,1697],{"class":1696},[1632,2222,2223],{"class":1700}," connect ",[1632,2225,1704],{"class":1646},[1632,2227,1707],{"class":1650},[1632,2229,1710],{"class":1700},[1632,2231,1713],{"class":1646},[1632,2233,2234],{"class":1642},"./db",[1632,2236,1713],{"class":1646},[1632,2238,1721],{"class":1700},[1632,2240,1724],{"class":1646},[1632,2242,2243,2245,2247,2249,2251,2253,2255,2258,2260,2262],{"class":1634,"line":1657},[1632,2244,1697],{"class":1696},[1632,2246,2085],{"class":1700},[1632,2248,1704],{"class":1646},[1632,2250,1707],{"class":1650},[1632,2252,1710],{"class":1700},[1632,2254,1713],{"class":1646},[1632,2256,2257],{"class":1642},"./user",[1632,2259,1713],{"class":1646},[1632,2261,1721],{"class":1700},[1632,2263,1724],{"class":1646},[1632,2265,2266],{"class":1634,"line":1669},[1632,2267,1730],{"emptyLinePlaceholder":1729},[1632,2269,2270,2272,2274,2277,2279],{"class":1634,"line":1750},[1632,2271,1735],{"class":1696},[1632,2273,1738],{"class":1696},[1632,2275,2276],{"class":1650}," main",[1632,2278,1744],{"class":1646},[1632,2280,1747],{"class":1646},[1632,2282,2283,2285,2287,2289],{"class":1634,"line":1770},[1632,2284,1754],{"class":1753},[1632,2286,1741],{"class":1650},[1632,2288,1744],{"class":1766},[1632,2290,1724],{"class":1646},[1632,2292,2293],{"class":1634,"line":1782},[1632,2294,1730],{"emptyLinePlaceholder":1729},[1632,2296,2297],{"class":1634,"line":1790},[1632,2298,2300],{"class":2299},"syuKq","    // 新增\n",[1632,2302,2303,2306,2309,2311,2314,2316,2318,2321,2323,2326,2329,2331,2333,2336,2338,2340,2343,2345,2348,2350,2353,2355,2357,2360,2362,2365,2367],{"class":1634,"line":1814},[1632,2304,2305],{"class":1696},"    const",[1632,2307,2308],{"class":1700}," user",[1632,2310,1831],{"class":1646},[1632,2312,2313],{"class":1753}," await",[1632,2315,2124],{"class":1700},[1632,2317,1760],{"class":1646},[1632,2319,2320],{"class":1650},"create",[1632,2322,1710],{"class":1766},[1632,2324,2325],{"class":1646},"{",[1632,2327,2328],{"class":1766}," username",[1632,2330,1968],{"class":1646},[1632,2332,2058],{"class":1646},[1632,2334,2335],{"class":1642},"小明",[1632,2337,1713],{"class":1646},[1632,2339,1982],{"class":1646},[1632,2341,2342],{"class":1766}," age",[1632,2344,1968],{"class":1646},[1632,2346,2347],{"class":2020}," 20",[1632,2349,1982],{"class":1646},[1632,2351,2352],{"class":1766}," city",[1632,2354,1968],{"class":1646},[1632,2356,2058],{"class":1646},[1632,2358,2359],{"class":1642},"北京",[1632,2361,1713],{"class":1646},[1632,2363,2364],{"class":1646}," }",[1632,2366,1721],{"class":1766},[1632,2368,1724],{"class":1646},[1632,2370,2371,2373,2375,2377,2379,2381,2384,2386,2388,2390,2392],{"class":1634,"line":1820},[1632,2372,1793],{"class":1700},[1632,2374,1760],{"class":1646},[1632,2376,1798],{"class":1650},[1632,2378,1710],{"class":1766},[1632,2380,1713],{"class":1646},[1632,2382,2383],{"class":1642},"新增成功：",[1632,2385,1713],{"class":1646},[1632,2387,1982],{"class":1646},[1632,2389,2308],{"class":1700},[1632,2391,1721],{"class":1766},[1632,2393,1724],{"class":1646},[1632,2395,2396],{"class":1634,"line":1825},[1632,2397,1730],{"emptyLinePlaceholder":1729},[1632,2399,2400],{"class":1634,"line":2117},[1632,2401,2402],{"class":2299},"    // 查询全部\n",[1632,2404,2406,2408,2411,2413,2415,2417,2419,2422,2424],{"class":1634,"line":2405},12,[1632,2407,2305],{"class":1696},[1632,2409,2410],{"class":1700}," users",[1632,2412,1831],{"class":1646},[1632,2414,2313],{"class":1753},[1632,2416,2124],{"class":1700},[1632,2418,1760],{"class":1646},[1632,2420,2421],{"class":1650},"find",[1632,2423,1744],{"class":1766},[1632,2425,1724],{"class":1646},[1632,2427,2429,2431,2433,2435,2437,2439,2442,2444,2446,2448,2450],{"class":1634,"line":2428},13,[1632,2430,1793],{"class":1700},[1632,2432,1760],{"class":1646},[1632,2434,1798],{"class":1650},[1632,2436,1710],{"class":1766},[1632,2438,1713],{"class":1646},[1632,2440,2441],{"class":1642},"用户列表：",[1632,2443,1713],{"class":1646},[1632,2445,1982],{"class":1646},[1632,2447,2410],{"class":1700},[1632,2449,1721],{"class":1766},[1632,2451,1724],{"class":1646},[1632,2453,2455],{"class":1634,"line":2454},14,[1632,2456,1730],{"emptyLinePlaceholder":1729},[1632,2458,2460],{"class":1634,"line":2459},15,[1632,2461,2462],{"class":2299},"    // 按 id 查询单个用户\n",[1632,2464,2466,2468,2471,2473,2475,2477,2479,2482,2484,2486,2488,2491,2493],{"class":1634,"line":2465},16,[1632,2467,2305],{"class":1696},[1632,2469,2470],{"class":1700}," found",[1632,2472,1831],{"class":1646},[1632,2474,2313],{"class":1753},[1632,2476,2124],{"class":1700},[1632,2478,1760],{"class":1646},[1632,2480,2481],{"class":1650},"findById",[1632,2483,1710],{"class":1766},[1632,2485,1558],{"class":1700},[1632,2487,1760],{"class":1646},[1632,2489,2490],{"class":1700},"_id",[1632,2492,1721],{"class":1766},[1632,2494,1724],{"class":1646},[1632,2496,2498,2500,2502,2504,2506,2508,2511,2513,2515,2517,2519],{"class":1634,"line":2497},17,[1632,2499,1793],{"class":1700},[1632,2501,1760],{"class":1646},[1632,2503,1798],{"class":1650},[1632,2505,1710],{"class":1766},[1632,2507,1713],{"class":1646},[1632,2509,2510],{"class":1642},"按 id 查询：",[1632,2512,1713],{"class":1646},[1632,2514,1982],{"class":1646},[1632,2516,2470],{"class":1700},[1632,2518,1721],{"class":1766},[1632,2520,1724],{"class":1646},[1632,2522,2524],{"class":1634,"line":2523},18,[1632,2525,1730],{"emptyLinePlaceholder":1729},[1632,2527,2529],{"class":1634,"line":2528},19,[1632,2530,2531],{"class":2299},"    // 更新\n",[1632,2533,2535,2537,2539,2541,2544,2546,2548,2551,2553,2555,2557,2559,2562,2564,2566,2568,2571,2573,2575],{"class":1634,"line":2534},20,[1632,2536,1754],{"class":1753},[1632,2538,2124],{"class":1700},[1632,2540,1760],{"class":1646},[1632,2542,2543],{"class":1650},"updateOne",[1632,2545,1710],{"class":1766},[1632,2547,2325],{"class":1646},[1632,2549,2550],{"class":1766}," _id",[1632,2552,1968],{"class":1646},[1632,2554,2308],{"class":1700},[1632,2556,1760],{"class":1646},[1632,2558,2490],{"class":1700},[1632,2560,2561],{"class":1646}," },",[1632,2563,1971],{"class":1646},[1632,2565,2342],{"class":1766},[1632,2567,1968],{"class":1646},[1632,2569,2570],{"class":2020}," 26",[1632,2572,2364],{"class":1646},[1632,2574,1721],{"class":1766},[1632,2576,1724],{"class":1646},[1632,2578,2580],{"class":1634,"line":2579},21,[1632,2581,1730],{"emptyLinePlaceholder":1729},[1632,2583,2585],{"class":1634,"line":2584},22,[1632,2586,2587],{"class":2299},"    // 删除\n",[1632,2589,2591,2593,2595,2597,2600,2602,2604,2606,2608,2610,2612,2614,2616,2618],{"class":1634,"line":2590},23,[1632,2592,1754],{"class":1753},[1632,2594,2124],{"class":1700},[1632,2596,1760],{"class":1646},[1632,2598,2599],{"class":1650},"deleteOne",[1632,2601,1710],{"class":1766},[1632,2603,2325],{"class":1646},[1632,2605,2550],{"class":1766},[1632,2607,1968],{"class":1646},[1632,2609,2308],{"class":1700},[1632,2611,1760],{"class":1646},[1632,2613,2490],{"class":1700},[1632,2615,2364],{"class":1646},[1632,2617,1721],{"class":1766},[1632,2619,1724],{"class":1646},[1632,2621,2623],{"class":1634,"line":2622},24,[1632,2624,1730],{"emptyLinePlaceholder":1729},[1632,2626,2628,2631,2633,2636,2638,2641,2643],{"class":1634,"line":2627},25,[1632,2629,2630],{"class":1700},"    process",[1632,2632,1760],{"class":1646},[1632,2634,2635],{"class":1650},"exit",[1632,2637,1710],{"class":1766},[1632,2639,2640],{"class":2020},"0",[1632,2642,1721],{"class":1766},[1632,2644,1724],{"class":1646},[1632,2646,2648],{"class":1634,"line":2647},26,[1632,2649,1817],{"class":1646},[1632,2651,2653],{"class":1634,"line":2652},27,[1632,2654,1730],{"emptyLinePlaceholder":1729},[1632,2656,2658,2661,2663],{"class":1634,"line":2657},28,[1632,2659,2660],{"class":1650},"main",[1632,2662,1744],{"class":1700},[1632,2664,1724],{"class":1646},[1531,2666,2667,2668,2670,2671,2674,2675,2670,2677,2674,2679,1881,2681,2683,2684,2686],{},"和官方驱动对比着看：",[1556,2669,2320],{}," 对应 ",[1556,2672,2673],{},"insertOne","，",[1556,2676,2421],{},[1556,2678,2421],{},[1556,2680,2543],{},[1556,2682,2599],{}," 名字都一样。区别在于 ",[1556,2685,2320],{}," 会直接返回创建好的完整文档，不用再查一次；查询返回的也都是带 Schema 结构的文档对象，字段清清楚楚。",[1531,2688,2689,2690,2692],{},"再来看数据校验怎么生效。试着创建一条缺少 ",[1556,2691,1562],{}," 的数据：",[1623,2694,2696],{"className":1687,"code":2695,"language":1689,"meta":1628,"style":1628},"await User.create({ age: 20, city: '北京' });\n",[1556,2697,2698],{"__ignoreMap":1628},[1632,2699,2700,2703,2705,2707,2709,2711,2713,2715,2717,2719,2721,2723,2725,2727,2729,2731,2733,2735],{"class":1634,"line":1635},[1632,2701,2702],{"class":1753},"await",[1632,2704,2124],{"class":1700},[1632,2706,1760],{"class":1646},[1632,2708,2320],{"class":1650},[1632,2710,1710],{"class":1700},[1632,2712,2325],{"class":1646},[1632,2714,2342],{"class":1766},[1632,2716,1968],{"class":1646},[1632,2718,2347],{"class":2020},[1632,2720,1982],{"class":1646},[1632,2722,2352],{"class":1766},[1632,2724,1968],{"class":1646},[1632,2726,2058],{"class":1646},[1632,2728,2359],{"class":1642},[1632,2730,1713],{"class":1646},[1632,2732,2364],{"class":1646},[1632,2734,1721],{"class":1700},[1632,2736,1724],{"class":1646},[1531,2738,2739,2740,2743,2744,2746,2747,2749,2750,2753,2754,2757],{},"运行后会抛出 ",[1556,2741,2742],{},"ValidationError","，错误信息里明确告诉你 ",[1556,2745,1562],{}," 是必填字段。同样，把 ",[1556,2748,2145],{}," 写成 200 也会因为超出 ",[1556,2751,2752],{},"max: 150"," 被拒绝。",[1538,2755,2756],{},"脏数据根本进不了数据库","，这就是 Schema 的价值。",[1546,2759],{},[1526,2761,2763],{"id":2762},"️-和官方驱动怎么选","⚖️ 和官方驱动怎么选",[1531,2765,2766],{},"两个工具没有绝对的好坏，关键看场景：",[1840,2768,2769,2775],{},[1843,2770,2771,2774],{},[1538,2772,2773],{},"官方驱动","：写法更接近 MongoDB 原生语法，包更小。写一次性脚本、数据迁移工具，或者需要精细控制查询细节时，用它更轻量。",[1843,2776,2777,2779],{},[1538,2778,1335],{},"：自带结构定义和数据校验，还有中间件、关联查询等进阶能力。业务项目里多人协作、数据字段固定时，用它能省掉大量校验代码，结构也更清晰。",[1531,2781,2782,2783,2786],{},"可以这么记：",[1538,2784,2785],{},"临时脚本用驱动，正经业务用 Mongoose","。实际工作中业务项目里 Mongoose 是主流选择。",[1546,2788],{},[1526,2790,2792],{"id":2791},"小节总结","🧾 小节总结",[1840,2794,2795,2798,2812,2815,2824,2842],{},[1843,2796,2797],{},"MongoDB 不限制文档结构，灵活但容易写乱；Mongoose 是 ODM 工具，为集合加上结构约束和数据校验。",[1843,2799,2800,2801,2804,2805,2808,2809,2201],{},"安装：",[1556,2802,2803],{},"npm install mongoose","，连接用 ",[1556,2806,2807],{},"mongoose.connect()","，连接串里直接带数据库名，带密码连接时要加 ",[1556,2810,2811],{},"authSource=admin",[1843,2813,2814],{},"Schema 描述文档结构（类型、必填、默认值、取值范围），Model 由 Schema 生成，是增删改查的操作入口。",[1843,2816,2817,2818,2820,2821,2823],{},"模型名 ",[1556,2819,2174],{}," 会自动对应小写复数的 ",[1556,2822,2182],{}," 集合，可用第三个参数显式指定集合名。",[1843,2825,2826,2827,1600,2830,1600,2833,1600,2836,1600,2839,2201],{},"CRUD 用 ",[1556,2828,2829],{},"User.create()",[1556,2831,2832],{},"User.find()",[1556,2834,2835],{},"User.findById()",[1556,2837,2838],{},"User.updateOne()",[1556,2840,2841],{},"User.deleteOne()",[1843,2843,2844,2845,2847],{},"不符合 Schema 规则的数据会抛出 ",[1556,2846,2742],{},"，无法写入数据库。",[1546,2849],{},[1526,2851,2853],{"id":2852},"知识问答","❓ 知识问答",[1531,2855,2856],{},[1538,2857,2858],{},"Q1：ODM 和之前听过的 ORM 是什么关系？",[1531,2860,2861],{},"思路是一样的，都是把代码里的对象映射到数据库。ORM 对应关系型数据库（对象映射到表和行），ODM 对应 MongoDB 这类文档数据库（对象映射到集合和文档）。",[1531,2863,2864],{},[1538,2865,2866],{},"Q2：Schema 里没定义的字段还能写进去吗？",[1531,2868,2869],{},"默认不能。Mongoose 会忽略 Schema 里没有声明的字段，写入时自动丢弃。这也是它帮你保持数据结构干净的一部分。",[1531,2871,2872],{},[1538,2873,2874,2875,2877],{},"Q3：已有的集合里没有 ",[1556,2876,2490],{}," 之外的约束，用 Mongoose 会报错吗？",[1531,2879,2880],{},"不会。Schema 校验只发生在「通过 Mongoose 写入」时，已经存在的历史数据不受影响。查询时也能正常读出。",[1531,2882,2883],{},[1538,2884,2885,2886,2888],{},"Q4：连接串里的 ",[1556,2887,2811],{}," 能不能省略？",[1531,2890,2891],{},"本课程的 Docker 环境不能省略，因为 root 账号是在 admin 库里创建的。如果你用的是专门为某个业务库创建的账号，authSource 就要填那个业务库的名字。",[1531,2893,2894],{},[1538,2895,2896,2897,2900],{},"Q5：",[1556,2898,2899],{},"User.updateOne"," 更新时会触发 Schema 校验吗？",[1531,2902,2903,2904,2906,2907,2910,2911,2914],{},"默认情况下 ",[1556,2905,2543],{}," 不做完整校验（比如不会检查 ",[1556,2908,2909],{},"required","）。如果需要更新时也校验，可以传入 ",[1556,2912,2913],{},"{ runValidators: true }"," 选项。日常开发知道有这个开关即可。",[1546,2916],{},[1526,2918,2920],{"id":2919},"小练习","🧪 小练习",[1531,2922,2923,2924,2927,2928,2931],{},"练习一：给 ",[1556,2925,2926],{},"userSchema"," 增加一个 ",[1556,2929,2930],{},"email"," 字段，要求字符串类型、必填。然后创建一条带 email 的用户数据。",[1623,2933,2935],{"className":1687,"code":2934,"filename":1909,"language":1689,"meta":1628,"style":1628},"const userSchema = new mongoose.Schema({\n    username: { type: String, required: true },\n    age: { type: Number, min: 0, max: 150 },\n    city: { type: String, default: '未知' },\n    // 请在这里编写代码\n});\n",[1556,2936,2937,2957,2981,3013,3041,3046],{"__ignoreMap":1628},[1632,2938,2939,2941,2943,2945,2947,2949,2951,2953,2955],{"class":1634,"line":1635},[1632,2940,1697],{"class":1696},[1632,2942,1944],{"class":1700},[1632,2944,1704],{"class":1646},[1632,2946,1949],{"class":1646},[1632,2948,1757],{"class":1700},[1632,2950,1760],{"class":1646},[1632,2952,1880],{"class":1650},[1632,2954,1710],{"class":1700},[1632,2956,1960],{"class":1646},[1632,2958,2959,2961,2963,2965,2967,2969,2971,2973,2975,2977,2979],{"class":1634,"line":1657},[1632,2960,1965],{"class":1766},[1632,2962,1968],{"class":1646},[1632,2964,1971],{"class":1646},[1632,2966,1974],{"class":1766},[1632,2968,1968],{"class":1646},[1632,2970,1979],{"class":1700},[1632,2972,1982],{"class":1646},[1632,2974,1985],{"class":1766},[1632,2976,1968],{"class":1646},[1632,2978,1991],{"class":1990},[1632,2980,1994],{"class":1646},[1632,2982,2983,2985,2987,2989,2991,2993,2995,2997,2999,3001,3003,3005,3007,3009,3011],{"class":1634,"line":1669},[1632,2984,1999],{"class":1766},[1632,2986,1968],{"class":1646},[1632,2988,1971],{"class":1646},[1632,2990,1974],{"class":1766},[1632,2992,1968],{"class":1646},[1632,2994,2010],{"class":1700},[1632,2996,1982],{"class":1646},[1632,2998,2015],{"class":1766},[1632,3000,1968],{"class":1646},[1632,3002,2021],{"class":2020},[1632,3004,1982],{"class":1646},[1632,3006,2026],{"class":1766},[1632,3008,1968],{"class":1646},[1632,3010,2031],{"class":2020},[1632,3012,1994],{"class":1646},[1632,3014,3015,3017,3019,3021,3023,3025,3027,3029,3031,3033,3035,3037,3039],{"class":1634,"line":1750},[1632,3016,2038],{"class":1766},[1632,3018,1968],{"class":1646},[1632,3020,1971],{"class":1646},[1632,3022,1974],{"class":1766},[1632,3024,1968],{"class":1646},[1632,3026,1979],{"class":1700},[1632,3028,1982],{"class":1646},[1632,3030,2053],{"class":1766},[1632,3032,1968],{"class":1646},[1632,3034,2058],{"class":1646},[1632,3036,2061],{"class":1642},[1632,3038,1713],{"class":1646},[1632,3040,1994],{"class":1646},[1632,3042,3043],{"class":1634,"line":1770},[1632,3044,3045],{"class":2299},"    // 请在这里编写代码\n",[1632,3047,3048,3050,3052],{"class":1634,"line":1782},[1632,3049,2070],{"class":1646},[1632,3051,1721],{"class":1700},[1632,3053,1724],{"class":1646},[1531,3055,3056,3057,3060,3061,3063],{},"练习二：写一个 ",[1556,3058,3059],{},"findUsersByCity"," 函数，接收城市名参数，用 ",[1556,3062,2832],{}," 返回该城市的所有用户。",[1623,3065,3067],{"className":1687,"code":3066,"filename":2214,"language":1689,"meta":1628,"style":1628},"async function findUsersByCity(city) {\n    // 请在这里编写代码\n}\n",[1556,3068,3069,3087,3091],{"__ignoreMap":1628},[1632,3070,3071,3073,3075,3078,3080,3083,3085],{"class":1634,"line":1635},[1632,3072,1735],{"class":1696},[1632,3074,1738],{"class":1696},[1632,3076,3077],{"class":1650}," findUsersByCity",[1632,3079,1710],{"class":1646},[1632,3081,2158],{"class":3082},"sK9QF",[1632,3084,1721],{"class":1646},[1632,3086,1747],{"class":1646},[1632,3088,3089],{"class":1634,"line":1657},[1632,3090,3045],{"class":2299},[1632,3092,3093],{"class":1634,"line":1669},[1632,3094,1817],{"class":1646},[1546,3096],{},[1531,3098,3099,3100,3102],{},"🎉 恭喜你已经掌握用 Mongoose 优雅操作 MongoDB 的技能啦！下一篇我们聊聊",[1538,3101,1339],{},"，看看数据量大起来之后，怎样给查询提速，让 MongoDB 保持轻快。",[3104,3105,3106],"style",{},"html pre.shiki code .sYGMc, html code.shiki .sYGMc{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}html pre.shiki code .sIEYB, html code.shiki .sIEYB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .s86vT, html code.shiki .s86vT{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .swgpB, html code.shiki .swgpB{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html pre.shiki code .s50WR, html code.shiki .s50WR{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .sndM8, html code.shiki .sndM8{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .s8pZq, html code.shiki .s8pZq{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}html pre.shiki code .sd2Uz, html code.shiki .sd2Uz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .sPKOg, html code.shiki .sPKOg{--shiki-light:#FF5370;--shiki-default:#FF9CAC;--shiki-dark:#FF9CAC}html pre.shiki code .smPcV, html code.shiki .smPcV{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}html pre.shiki code .syuKq, html code.shiki .syuKq{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#546E7A;--shiki-default-font-style:italic;--shiki-dark:#676E95;--shiki-dark-font-style:italic}html pre.shiki code .sK9QF, html code.shiki .sK9QF{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#EEFFFF;--shiki-default-font-style:italic;--shiki-dark:#BABED8;--shiki-dark-font-style:italic}",{"title":1628,"searchDepth":1657,"depth":1657,"links":3108},[3109,3110,3111,3112,3113,3114,3115,3116,3117],{"id":1528,"depth":1657,"text":1529},{"id":1550,"depth":1657,"text":1551},{"id":1592,"depth":1657,"text":1593},{"id":1873,"depth":1657,"text":1874},{"id":2206,"depth":1657,"text":2207},{"id":2762,"depth":1657,"text":2763},{"id":2791,"depth":1657,"text":2792},{"id":2852,"depth":1657,"text":2853},{"id":2919,"depth":1657,"text":2920},"了解 ODM 是什么，学会用 Mongoose 的 Schema 和 Model 完成增删改查与数据校验。","md",null,{},{"title":1335},{"title":1521,"description":3118},"MLXF1HmtDM",[3126,3128],{"title":1331,"path":1332,"stem":1333,"description":3127,"children":-1},"学会用官方 mongodb 驱动在 Node.js 中连接数据库并完成增删改查，打通前后端数据链路。",{"title":1339,"path":1340,"stem":1341,"description":3129,"children":-1},"理解索引的作用，学会创建、查看和删除索引，并用 explain 验证索引是否生效。",1784715109863]