vovaevents.blogg.se - Robo 3t search commands

Sollution: Manually set DNS for your devices. If everything goes well, then you get the sollution. You can have a try on ping xxx(your mongo-server) which will use 8.8.8.8 as your DNS. Someone may had polluted this DNS server. The DNS that you are using cannot interpret your mongo host correctly. (Actually, even if they are on the same network segment, things won't work if someone polluted your DNS server.) And they are not belong to the same network segment. For example my DNS is 172.16.* and my network gateway (execute ifconig and check en0) is 172.17.*. You should check your DNS and your network gateway. If you cannot get the response, that means there is something wrong with your network. If so, that's means you may set wrong mongo config in you Robo 3T. I think there are some things you need to check to help you know what's the problem.įirst try to ping the mongo server in your terminal to see whether you can get responses. Here we discuss the introduction, how does find by id work in MongoDB? and their examples respectively.I also meet this problem when I use Robo 3T on Mac. The find() function internally calls the findOne() in order to handle the situation accordingly. As we know that the find() function is used in order to perform the task of retrieving the documents with the given id. The above description clearly explains what the find by id is and how it works in MongoDB to retrieve the documents according to the specified id by the user. Else for the other cases, all the documents satisfying the condition mentioned in the find() parameters would be displayed to the user on the console. In the case of ObjectId only one document would be displayed to the user as it is unique to each document and can never be the same.It is never the case of find() function that only one record will be retrieved at a time. So when we pass the parameter of “city” : “agra”, all the documents matching the criteria will be displayed to the user on the console. In the above example, as we can see that there is more than one document present in the collection having the field “city” as “agra”.

Using the find() function and passing the parameter of the field which is the same for more than one record. Suppose there are two or more documents in the collections having the same value for the particular field.bLet see the situation with the help of the data present in the collection similar to the one given below: As the “name” is also a field on which each document can be filtered, so the document having the “name” as “sunita” is found and all its details are displayed to the user on the console.As we can see in the above example, the user can also put the parameter of find function of the other fields of the document.Using the find() function by passing the parameters of the fields other than the unique objectId.

We can provide the ObjectId as a parameter of the find() function in MongoDB and its respective document is displayed on the console to the user.

ObjectId is the unique id that is automatically allocated when a new document is inserted into the collection.

In the above example, the document is found on the basis of the ObjectId of the document.

When the user calls findById(_id) in Mongoose, it automatically calls findOne().

As the name suggests, find by id is used to retrieve the details of the document matching the particular ‘id’ provided by the user where ‘id’ is the automatically generated ‘id’ when a document is created in the database.

It returns the cursor to the documents which match the query criteria.

This parameter can be omitted in order to return all the fields in the matching documents. It specifies the field which will return matching the query filter. projection: It is an optional parameter.This parameter can be omitted in order to return all the documents in a collection. It specifies the selection filter using the operators of the query.