Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>There is no good way to detect circularity in objects but it is possible though by walking the object tree and checking references. I baked up a node-walking function that tries to detect if a node has been already used as its parent</p> <pre><code>function isCircularObject(node, parents){ parents = parents || []; if(!node || typeof node != "object"){ return false; } var keys = Object.keys(node), i, value; parents.push(node); // add self to current path for(i = keys.length-1; i&gt;=0; i--){ value = node[keys[i]]; if(value &amp;&amp; typeof value == "object"){ if(parents.indexOf(value)&gt;=0){ // circularity detected! return true; } // check child nodes if(arguments.callee(value, parents)){ return true; } } } parents.pop(node); return false; } </code></pre> <p>And the usage would be <code>isCircularObject(obj_value)</code> where the function returns <code>true</code> if circularity exists and <code>false</code> if not.</p> <pre><code>// setup test object var testObj = { property_a:1, property_b: { porperty_c: 2 }, property_d: { property_e: { property_f: 3 } } } console.log(isCircularObject(testObj)); // false // add reference to another node in the same object testObj.property_d.property_e.property_g = testObj.property_b; console.log(isCircularObject(testObj)); // false // add circular node testObj.property_b.property_c = testObj.property_b; console.log(isCircularObject(testObj)); // true </code></pre> <p>The key point being that an object value is equal with an other value <em>only</em> if it is the same object reference and not when it's another object (even if completely similar).</p>
    singulars
    1. This table or related slice is empty.
    1. POIs there a way to test circular reference in JavaScript?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USAndris
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COThank you very much!
      singulars
      1. PO
      1. UScorazza
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload