使用Graphql-js模式克服代码重复

Question

我正在用GraphQL-Js & Mongo学习GraphQL。

我发现GraphQL模式中有很多代码重复。

我的GraphQL输入对象如下所示：

const PricingInputType = new GraphQLInputObjectType({
  name: 'PricingInput',
  fields: () => ({
    expires: { type: GraphQLInt },
    private: { type: GraphQLBoolean },
    monthly: { type: GraphQLInt },
    scanEnvelope: { type: GraphQLInt },
    initalScan: { type: GraphQLInt },
    perPage: { type: GraphQLInt },
    forwardMail: { type: GraphQLInt },
    forwardParcel: { type: GraphQLInt },
    shred: { type: GraphQLInt },
    perMonthPerGram: { type: GraphQLInt },
    freeStorePerGram: { type: GraphQLInt },
    setup: { type: GraphQLInt },
    idFree: { type: GraphQLInt }
  })
});

const PlanInputType = new GraphQLInputObjectType({
  name: 'PlanInput',
  fields: () => ({
    id: { type: GraphQLString },
    planName: { type: GraphQLString },
    pricing: { type: PricingInputType }
  })
});

const Mutation = new GraphQLObjectType({
  name: 'Mutation',
  fields: {
      addPlan: {
          type: PlanType,
          args: {
            Plan: { type: PlanInputType }
          },
          resolve(parent, args){
            //TO DO. UPSERT TO MONGO
              return true;
          }
      }
    }
});

其中我的查询对象如下所示：

const PricingType = new GraphQLObjectType({
  name: "Pricing",
  fields: () => ({
    expires: { type: GraphQLInt },
    private: { type: GraphQLBoolean },
    monthly: { type: GraphQLInt },
    scanEnvelope: { type: GraphQLInt },
    initalScan: { type: GraphQLInt },
    perPage: { type: GraphQLInt },
    forwardMail: { type: GraphQLInt },
    forwardParcel: { type: GraphQLInt },
    shred: { type: GraphQLInt },
    perMonthPerGram: { type: GraphQLInt },
    freeStorePerGram: { type: GraphQLInt },
    setup: { type: GraphQLInt },
    idFree: { type: GraphQLInt }
  })
});

const PlanType = new GraphQLObjectType({
  name: "Plan",
  fields: () => ({
    id: { type: GraphQLString },
    planName: { type: GraphQLString },
    pricing: { type: PricingType }
  })
});

const RootQuery = new GraphQLObjectType({
  name: "RootQueryType",
  fields: {
    plans: {
      type: new GraphQLList(PlanType),
      resolve(parent, args) {
        return Plans.find({});
      }
    }
  }
});

现在我的Mongo Schema看起来像这样：

var plansSchema = new Schema({
  planName:  {
    type: String,
    required: [true, "Plan name is required"]
  },
  pricing: {
    monthly: Number,
    scanEnvelope: Number,
    initalScan: Number,
    perPage: Number,
    forwardMail: Number,
    forwardParcel: Number,
    shred: Number,
    perMonthPerGram: Number,
    freeStorePerGram: Number,
    setup: Number,
    idFree: Number
  },
  expires: Number,
  private: Boolean,
  deleted: Boolean,
  date: { type: Date, default: Date.now },
});

module.exports =  mongoose.model('plans', plansSchema);

如你所见，我在3个地方复制代码。如果我决定按季收费而不是按月收费，我需要在3个地方更改Monthly属性！？

有没有更好的模式？或者这只是一种方法？

Answer 1

你可以看看我的answer来回答类似的问题。它使用一个依赖于GraphQL“查询对象”的package来生成其他所有内容，因此放弃了mongoose而直接使用MongoDB。