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Access property of object nested in array nested in object with a for loop Mongoose

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0

I'm new to js (clearly). I'm using mongoose and I was wondering : why do I get an error while accessing property with a for loop?

I'm using a schema that contains embedded schema

Usr.findOne(numCli: req.body.numTar, function(err, doc)

 if (doc) 

 var i = 0;
 const lengthAcc = doc.acc.length;
//can access prop individually
 console.log(doc.acc[lengthAcc-1].propOne);

// can't using for loop: TypeError: Cannot read property 'propOne' of undefined
 for (i = 0; i < 10; i++) 
 console.log(doc.acc[lengthAcc - i].propOne);


 
 
 );

node.js mongoose nested schema

share|improve this question

asked Mar 7 at 4:30

cegceg

32

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Why to 10? AFAIK Mongoose does not do negative notation on lengths
  
  – Neil Lunn
  Mar 7 at 4:33
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Should have clarifed. Each array has 10 objects in it. Just thought I could use a for loop to access each prop of each individual object
  
  – ceg
  Mar 7 at 4:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i=1, start i from 1
  
  – Şivā SankĂr
  Mar 7 at 4:41
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I don't think you have 10 elements in what you are checking. console.log(doc.acc[-1].propOne) will reproduce the error. Instead your loop should be for (i = 1; i < lengthAcc; i++) to ensure you are not ever using a negative notation. Note these are not "really" arrays, but complex objects which just have "array like accessors". Hence the difference.
  
  – Neil Lunn
  Mar 7 at 4:53
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks. Should have seen it, yet it had eluded me for quite come time. Definitely need a break. And thanks for the clarification regarding those "arrays". Will look into it
  
  – ceg
  Mar 7 at 4:55
  
  

  
  
  
  

add a comment | 

0

I'm new to js (clearly). I'm using mongoose and I was wondering : why do I get an error while accessing property with a for loop?

I'm using a schema that contains embedded schema

Usr.findOne(numCli: req.body.numTar, function(err, doc)

 if (doc) 

 var i = 0;
 const lengthAcc = doc.acc.length;
//can access prop individually
 console.log(doc.acc[lengthAcc-1].propOne);

// can't using for loop: TypeError: Cannot read property 'propOne' of undefined
 for (i = 0; i < 10; i++) 
 console.log(doc.acc[lengthAcc - i].propOne);


 
 
 );

node.js mongoose nested schema

share|improve this question

asked Mar 7 at 4:30

cegceg

32

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Why to 10? AFAIK Mongoose does not do negative notation on lengths
  
  – Neil Lunn
  Mar 7 at 4:33
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Should have clarifed. Each array has 10 objects in it. Just thought I could use a for loop to access each prop of each individual object
  
  – ceg
  Mar 7 at 4:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i=1, start i from 1
  
  – Şivā SankĂr
  Mar 7 at 4:41
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I don't think you have 10 elements in what you are checking. console.log(doc.acc[-1].propOne) will reproduce the error. Instead your loop should be for (i = 1; i < lengthAcc; i++) to ensure you are not ever using a negative notation. Note these are not "really" arrays, but complex objects which just have "array like accessors". Hence the difference.
  
  – Neil Lunn
  Mar 7 at 4:53
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks. Should have seen it, yet it had eluded me for quite come time. Definitely need a break. And thanks for the clarification regarding those "arrays". Will look into it
  
  – ceg
  Mar 7 at 4:55
  
  

  
  
  
  

add a comment | 

I'm new to js (clearly). I'm using mongoose and I was wondering : why do I get an error while accessing property with a for loop?

I'm using a schema that contains embedded schema

Usr.findOne(numCli: req.body.numTar, function(err, doc)

 if (doc) 

 var i = 0;
 const lengthAcc = doc.acc.length;
//can access prop individually
 console.log(doc.acc[lengthAcc-1].propOne);

// can't using for loop: TypeError: Cannot read property 'propOne' of undefined
 for (i = 0; i < 10; i++) 
 console.log(doc.acc[lengthAcc - i].propOne);


 
 
 );

node.js mongoose nested schema

share|improve this question

asked Mar 7 at 4:30

cegceg

32

Usr.findOne(numCli: req.body.numTar, function(err, doc)

 if (doc) 

 var i = 0;
 const lengthAcc = doc.acc.length;
//can access prop individually
 console.log(doc.acc[lengthAcc-1].propOne);

// can't using for loop: TypeError: Cannot read property 'propOne' of undefined
 for (i = 0; i < 10; i++) 
 console.log(doc.acc[lengthAcc - i].propOne);


 
 
 );

share|improve this question

asked Mar 7 at 4:30

cegceg

32

share|improve this question

asked Mar 7 at 4:30

cegceg

32

asked Mar 7 at 4:30

cegceg

32

asked Mar 7 at 4:30

cegceg

32

1 Answer
1

active

oldest

votes

0

If check your code then in first console

 console.log(doc.acc[lengthAcc-1].propOne);

you are try to access doc.acc[lengthAcc-1].propOne so it's work

but in second console

console.log(doc.acc[lengthAcc - i].propOne);

you are try to access doc.acc[lengthAcc-i].propOne and i=0 so it's doc.acc[lengthAcc-0].propOne that's why it's not work

bcz array.length return number of element in array,
so if array contain 5 element (0-4) so array.length return 5

and if you try to access array[array.length - 1] = 4 it's equal to array[4] so it's work

but if you try to access array[array.length - 0] = 5 it's equal to array[5] and array doe not have index 5 so it throw error.

So, the solution is just start for loop from 1

for (i = 1; i < 10; i++) 
console.log(doc.acc[lengthAcc - i].propOne);

share|improve this answer

answered Mar 7 at 4:49

Tausif ShaikhTausif Shaikh

696

add a comment | 

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0

If check your code then in first console

 console.log(doc.acc[lengthAcc-1].propOne);

you are try to access doc.acc[lengthAcc-1].propOne so it's work

but in second console

console.log(doc.acc[lengthAcc - i].propOne);

you are try to access doc.acc[lengthAcc-i].propOne and i=0 so it's doc.acc[lengthAcc-0].propOne that's why it's not work

bcz array.length return number of element in array,
so if array contain 5 element (0-4) so array.length return 5

and if you try to access array[array.length - 1] = 4 it's equal to array[4] so it's work

but if you try to access array[array.length - 0] = 5 it's equal to array[5] and array doe not have index 5 so it throw error.

So, the solution is just start for loop from 1

for (i = 1; i < 10; i++) 
console.log(doc.acc[lengthAcc - i].propOne);

share|improve this answer

answered Mar 7 at 4:49

Tausif ShaikhTausif Shaikh

696

add a comment | 

0

If check your code then in first console

 console.log(doc.acc[lengthAcc-1].propOne);

you are try to access doc.acc[lengthAcc-1].propOne so it's work

but in second console

console.log(doc.acc[lengthAcc - i].propOne);

you are try to access doc.acc[lengthAcc-i].propOne and i=0 so it's doc.acc[lengthAcc-0].propOne that's why it's not work

bcz array.length return number of element in array,
so if array contain 5 element (0-4) so array.length return 5

and if you try to access array[array.length - 1] = 4 it's equal to array[4] so it's work

but if you try to access array[array.length - 0] = 5 it's equal to array[5] and array doe not have index 5 so it throw error.

So, the solution is just start for loop from 1

for (i = 1; i < 10; i++) 
console.log(doc.acc[lengthAcc - i].propOne);

share|improve this answer

answered Mar 7 at 4:49

Tausif ShaikhTausif Shaikh

696

add a comment | 

If check your code then in first console

 console.log(doc.acc[lengthAcc-1].propOne);

you are try to access doc.acc[lengthAcc-1].propOne so it's work

but in second console

console.log(doc.acc[lengthAcc - i].propOne);

you are try to access doc.acc[lengthAcc-i].propOne and i=0 so it's doc.acc[lengthAcc-0].propOne that's why it's not work

bcz array.length return number of element in array,
so if array contain 5 element (0-4) so array.length return 5

and if you try to access array[array.length - 1] = 4 it's equal to array[4] so it's work

but if you try to access array[array.length - 0] = 5 it's equal to array[5] and array doe not have index 5 so it throw error.

So, the solution is just start for loop from 1

for (i = 1; i < 10; i++) 
console.log(doc.acc[lengthAcc - i].propOne);

share|improve this answer

answered Mar 7 at 4:49

Tausif ShaikhTausif Shaikh

696

 console.log(doc.acc[lengthAcc-1].propOne);

console.log(doc.acc[lengthAcc - i].propOne);

for (i = 1; i < 10; i++) 
console.log(doc.acc[lengthAcc - i].propOne);

share|improve this answer

answered Mar 7 at 4:49

Tausif ShaikhTausif Shaikh

696

answered Mar 7 at 4:49

Tausif ShaikhTausif Shaikh

696

answered Mar 7 at 4:49

Tausif ShaikhTausif Shaikh

696