Query Strings
req.query() - used to get the query string(searched)
app.get("/search",(req,res)=>{
let {q}=req.query;
// console.log(q);
if(!q){
res.send("<h1>nothing searched</h1>");
}
res.send(`<h1>search results for ${q}</h1>`);
});
DATABASE RELATIONSHIPS
RELATIONSHIPS INCLUDE ONE - TO -ONE (1x 1) ONE ENTITY OF A TABLE IS IN RELATION WITH ONLY ONE ENTITY OF ANOTHER. ONE - TO -MANY (1x N) ONE ENTITY IS IN RELATION WITH MANY MANY - TO - MANY(NxN) MANY ENTITIES ARE IN RELATION WITH MANY OTHER. ONE- TO-MANY IS MORE HARDER TO BE REPRESENTED THAN ONE - TO - ONE AND MANY - TO - MANY ONE- TO -MANY IT IS CATEGORIZED INTO 3 BASED ON MANY MANY CAN BE IN 3 TYPES 1. ONE -TO-FEW: SMALL NUMBER (2,5 ,100,500) STORE THE CHILD DOCUMENT INSIDE PARENT TAKE ZOMATO OR AMAZON FOR EXAMPLE, A SINGLE USER CAN HAVE MULTIPLE ADDRESSES. HERE WE DONOT CREATE TWO MODELS FOR USER AND ADDRESS, AS ADDRESS IS ASSOCIATED WITH USER DIRECTILY, WE STORE THE CHILD DOCUMENT INSIDE PARENT. const mongoose = require ( "mongoose" ); const { Schema } = mongoose ; main () . then (() => { console . log ( "connection successful" ); }) . catch (( err ) => { console . log ( err );...
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