findOne

find a country

lets add getCountry functions:

Example 
    
  const getCountryValidator = () => {
    return object({
      set: object({
        countryId: objectIdValidation,
      }),
      get: coreApp.schemas.selectStruct("country", {
        citiesByPopulation: 1,
        users: 1,
        capital: 1,
      }),
    });
  };
  const getCountry: ActFn = async (body) => {
    const {
      set: { countryId },
      get,
    } = body.details;
    

    return await countries
      .findOne({
        filters: { _id: new ObjectId(countryId) },
        projection: get,
      });
      

  };
  coreApp.acts.setAct({
    schema: "country",
    actName: "getCountry",
    validator: getCountryValidator(),
    fn: getCountry,
  });

findOne functions accept three inputs:

  • filters which is mongodb findOne query operation
  • projection which is mongodb projection operation
  • and optional option which is mongodb findOption

You can also read mongodb findOne section for more information.

Return Of Example: 
    
      {
        body: 
          {
            _id: 659fda257b94d4cdfed11dec,
            name: Kiribati,
            population: 68092328,
            abb: AIA
          },
        success: true
      }