title: .find() in MongoDB with multiple conditions
body: <p>I'm building a webapp using meteor and JavaScript, and want to filter a JSON object based on attribute. I can run <code>fullList.find()</code> to get everything and <code>fullList.find({'Color': 'r'})</code> to get only "red" items, but I want to return all items that are either "red" or "blue", and can't figure out the proper syntax. I've tried various combinations such as <code>fullList.find({'Color': 'r' || 'b'})</code> and <code>fullList.find({'Color': ('r' || 'b')})</code>, but it either doesn't run at all or returns items with only one attribute, rather than returning items with either. I feel like this should be an easy fix, I'm just not very familiar with JavaScript.</p>
  
  <p>Here's my (relevant) code for completeness. Only the logic for two conditions being true (as opposed to one or three) is failing:</p>
  
  <pre class="lang-js prettyprint-override"><code>indicadores: function(){
          if (Session.get("displayUrgencies")){
              if (Session.get("displayInsuff")){
                  if (Session.get("displayStrengths")){
                      console.log("display all");
                      return fullList.find();
                  }
                  else {
                      console.log("display urgencies and insufficiencies");
                      return fullList.find({'Color': 'v' || 'r'});
                  }
              }
              else {
                  if (Session.get("displayStrengths")){
                      console.log("display urgencies and strengths");
                      return fullList.find({'Color': 'b' || 'r'});
                  }
                  else {
                      console.log("display urgencies");
                      return fullList.find({'Color': 'r'});
                  }
              }
          }
          else if (Session.get("displayInsuff")){
              if (Session.get("displayStrengths")){
                  console.log("display insufficiencies and strengths");
                  return fullList.find({'Color': 'v' || 'b'});
              }
              else {
                  console.log("display insufficiencies");
                  return fullList.find({'Color': 'v'});
              }
          }
          else if (Session.get("displayStrengths")){
              console.log("display strengths");
              return fullList.find({'Color': 'b'});
          }
          else {
              console.log("display all (default)");
              return fullList.find();
          }       
      },
  </code></pre>