Using parse cloud JavaScript to execute compound queries

Attempting a Parse.Query with multiple constraints, using both OR and AND operations. For instance, executing an operation similar to this:

(x1 greater than 2 OR x2 less than 5) && (x3 equal to 4) && (x4 greater than 7 OR x5 less than 8)

In this scenario, the variables x1, x2, x3 represent specific field query constraints. While one can utilize Parse.Query.or by inputting two separate queries as parameters and then incorporating additional constraints after performing AND operations on the result like so:

var lotsOfWins = new Parse.Query("Player");
lotsOfWins.greaterThan(150);

var fewWins = new Parse.Query("Player");
fewWins.lessThan(5);

var mainQuery = Parse.Query.or(lotsOfWins, fewWins);

The question arises about how to handle the aforementioned operation when dealing with multiple "OR" conditions. Is there a method to directly set these constraints in MongoDB?

Answer №1

The API documentation states that you are able to provide an unlimited number of arguments when using the Parse.Query.or method.

Answer №2

It is desired that the query be presented in disjunctive form, thus:

(x1>2 OR x2<5) && (x3 equalTo 4) && (x4>7 OR x5<8)

This can be reformulated as follows:

(A || B) && E && (C || D)

The next step involves converting CNF to DNF (using a handy tool by wolfram.alpha here)

(A && C && E) || (A && D && E) || (B && C && E) || (B && D && E)

The queries are then revised accordingly:

var q0=new Parse.Query("Player");
q0.greaterThan("x1", 2);
q0.greaterThan("x4", 7);
q0.equalTo("x3", 4);

var q1=new Parse.Query("Player");
q1.greaterThan("x1", 2);
q1.lessThan("x5", 8);
q1.equalTo("x3", 4);

var q2=new Parse.Query("Player");
q2.lessThan("x2", 5);
q2.greaterThan("x4", 7);
q2.equalTo("x3", 4);

var q3=new Parse.Query("Player");
q3.lessThan("x2", 5);
q3.lessThan("x5", 8);
q3.equalTo("x3", 4);

// Remember to use square brackets. The parameter for "or" needs to be an array
var mainQuery = Parse.Query.or([q0, q1, q2, q3]);

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