Question

我一直在关注Ben Awad在YouTube上的教程。具体来说，我正在使用ppl = True num = 3 string = f'I am {num:.2f}' if ppl else f'I am {num}' print(string) #if ppl False #=> i am 3 #if ppl True #=> i am 3.00来建立他概述的PostgreSQL数据库。

我想用驼峰大小写来定义我的字段，并像他在教程中所做的那样将它们转换成蛇形大小写，特别是在sequelize here中也概述了docs。但是，当我执行相同的操作时，我的表字段不会转换为蛇形。

这是我使用的代码的MWE：

models / index.js

sequelize

从上面的文件中可以理解，import Sequelize from 'sequelize'; var sequelize = new Sequelize('dms', 'postgres', 'postgres', { dialect: 'postgres', define: { underscored: true, freezeTableName: true, }, }); const models = { Appointments: sequelize.import('./appointment'), }; Object.keys(models).forEach(modelName => { if (models[modelName].associate) { models[modelName].associate(models); } }); models.sequelize = sequelize; models.Sequelize = Sequelize; export default models;应该将所有表字段都转换为蛇形，如上面的教程视频所述。

models / appointment.js

define: {underscored: true}

index.js

export default (sequelize, DataTypes) => {
    const Appointment = sequelize.define("appointment",
        {
            status: {
                type: DataTypes.STRING
            },
            appointmentStart: {
                type: DataTypes.DATE,
            },
            appointmentEnd: {
                type: DataTypes.DATE,
            },
        },
    );

    return Appointment;
};

上述MWE的输出SQL如下：

import { ApolloServer, gql} from 'apollo-server';
import typeDefs from './schema';
import resolvers from './resolvers';
import models from './models';

const PORT = 8080;

const graphqlEndpoint = '/graphql';

const server = new ApolloServer({
    typeDefs,
    resolvers,
    graphqlPath: graphqlEndpoint
});

models.sequelize.sync({force:true}).then(() =>  {
    server.listen(PORT)
});

可以看出，它不会将Executing (default): DROP TABLE IF EXISTS "appointment" CASCADE; Executing (default): DROP TABLE IF EXISTS "appointment" CASCADE; Executing (default): CREATE TABLE IF NOT EXISTS "appointment" ("id" SERIAL , "status" VARCHAR(255), "appointmentStart" TIMESTAMP WITH TIME ZONE, "appointmentEnd" TIMESTAMP WITH TIME ZONE, "created_at" TIMESTAMP WITH TIME ZONE NOT NULL, "updated_at" TIMESTAMP WITH TIME ZONE NOT NULL, PRIMARY KEY ("id")); Executing (default): SELECT i.relname AS name, ix.indisprimary AS primary, ix.indisunique AS unique, ix.indkey AS indkey, array_agg(a.attnum) as column_indexes, array_agg(a.attname) AS column_names, pg_get_indexdef(ix.indexrelid) AS definition FROM pg_class t, pg_class i, pg_index ix, pg_attribute a WHERE t.oid = ix.indrelid AND i.oid = ix.indexrelid AND a.attrelid = t.oid AND t.relkind = 'r' and t.relname = 'appointment' GROUP BY i.relname, ix.indexrelid, ix.indisprimary, ix.indisunique, ix.indkey ORDER BY i.relname;之类的字段转换为appointmentStart。

我还尝试过在单个模型上声明appointment_start，例如：

underscored: true

这也行不通。

我觉得我可能正在丢失一些明显的东西，或者存在根本性的误会。

Answer 1

您使用的是哪个版本的Sequelize？我猜是v4或更早的版本； underscored选项仅适用于v5或更高版本上的属性/列名称。

在Sequelize v4中，唯一受underscored: true影响的属性名称是使用timestamps: true时Sequelize创建的生成的时间戳属性；（即createdAt => created_at，updatedAt => updated_at等），

在sequelize.define()中声明的模型列不会转换为蛇形，您需要在每个驼峰式列名上显式设置field属性，以实现此目的。对于上面的appointmentStart列，它看起来像：

...
appointmentStart: {
    type: DataTypes.DATE,
    field: 'appointment_start',
},

Sequelize下划线的选项无法按预期运行

1 个答案: