Typescript 中的 Mongoose 静态模型定义

Question

我创建了一个 Mongoose 模式并为名为 Campaign 的模型添加了一些静态方法。

如果我 console.log Campaign 我可以看到上面的方法。问题是我不知道在哪里添加这些方法，以便 Typescript 也知道它们。

如果我将它们添加到我的 CampaignModelInterface 中，它们仅可用于模型的实例（或者至少 TS 认为它们是）。

campaignSchema.ts

  export interface CampaignModelInterface extends CampaignInterface, Document {
      // will only show on model instance
  }

  export const CampaignSchema = new Schema({
      title: { type: String, required: true },
      titleId: { type: String, required: true }
      ...etc
  )}

  CampaignSchema.statics.getLiveCampaigns = Promise.method(function (){
      const now: Date = new Date()
      return this.find({
           $and: [{startDate: {$lte: now} }, {endDate: {$gte: now} }]
      }).exec()
  })

  const Campaign = mongoose.model<CampaignModelInterface>('Campaign', CampaignSchema)
  export default Campaign

我也尝试通过 Campaign.schema.statics 访问它，但没有成功。

谁能建议如何让 TS 知道模型上存在的方法，而不是模型实例？

Answer 1

我在 , although I'll answer yours (mostly with the third section of my other answer) as you've provided a different schema. There is a helpful readme with the Mongoose typings which is fairly hidden away, but there's a section on static methods 上回答了一个非常相似的问题。

您描述的行为完全正常 - Typescript 被告知架构（描述 单个文档 的对象）具有名为 getLiveCampaigns 的方法。

相反，您需要告诉 Typescript 该方法在模型上，而不是模式上。完成后，您可以按照正常的 Mongoose 方法访问静态方法。您可以通过以下方式做到这一点：

// CampaignDocumentInterface should contain your schema interface,
// and should extend Document from mongoose.
export interface CampaignInterface extends CampaignDocumentInterface {
    // declare any instance methods here
}

// Model is from mongoose.Model
interface CampaignModelInterface extends Model<CampaignInterface> {
    // declare any static methods here
    getLiveCampaigns(): any; // this should be changed to the correct return type if possible.
}

export const CampaignSchema = new Schema({
    title: { type: String, required: true },
    titleId: { type: String, required: true }
    // ...etc
)}

CampaignSchema.statics.getLiveCampaigns = Promise.method(function (){
    const now: Date = new Date()
    return this.find({
        $and: [{startDate: {$lte: now} }, {endDate: {$gte: now} }]
    }).exec()
})

// Note the type on the variable, and the two type arguments (instead of one).
const Campaign: CampaignModelInterface = mongoose.model<CampaignInterface, CampaignModelInterface>('Campaign', CampaignSchema)
export default Campaign

Typescript 中的 Mongoose 静态模型定义

Mongoose static Model definitions in Typescript

typescript

mongoose-schema

mongoose-models