Added an ability to search using geo-spatial queries and filter documents by expression

lib/query.js

@@ -239,6 +239,26 @@ Query.prototype.matchFilter = function(field,value){
    return self;
 }
 
+/**
+ * Filter the set of documents found before to return the result with the given expression.
+ *
+ * @param {String} expression - expression
+ *
+ * @return {Query}
+ * @api public
+ *
+ * @example
+ * var query = client.createQuery();
+ * query.q({ '*' : '*' }).matchFilter('id', 100)
+ */
+
+Query.prototype.expressionFilter = function(expression){
+   var self = this;
+   var parameter = 'fq=' + encodeURIComponent(expression);
+   this.parameters.push(parameter);
+   return self;
+}
+
 /**
  * Specify a set of fields to return.
  *
@@ -693,6 +713,38 @@ Query.prototype.boost = function(functions){
    return self;
 }
 
+/**
+ * Create a geo-spatial query.
+ *
+ * @param {Object} options - set of options to create a spatial
+ * @param {Boolean} [options.on=true] - Turn on or off spatial
+ * @param {String} [options.pt] - The geo position point.
+ * @param {String} [options.sfield] - The name of the field where the confition is applied.
+ * @param {Number} [options.d] - The distance in kilometers.
+ *
+ * @return {Query}
+ * @api public
+ */
+
+Query.prototype.spatial = function(options) {
+    var self = this;
+    if(options.on === false){
+        this.parameters.push('spatial=false');
+    }else{
+        this.parameters.push('spatial=true');
+    }
+    if(options.pt !== undefined) {
+        this.parameters.push('pt=' + encodeURIComponent(options.pt))
+    }
+    if(options.sfield !== undefined){
+        this.parameters.push('sfield=' + options.sfield)
+    }
+    if(options.d !== undefined){
+        this.parameters.push('d=' + options.d)
+    }
+    return self;
+}
+
 /**
  * Build a querystring with the array of `this.parameters`.
  *