html - How to check for a value if it exists in a different database table -

i have scenario should display image when value of 1 field of table present in table. i'm not sure how condition can done. can help? in html or in angularjs. better understanding, code in html , i'm trying do,

html:

{% if {{vio.pdb_pid}}   }     {% if is_secure_device == 'true'%}         {% verbatim %}             <img class="img-rounded" ng-src="{{vio.pdb_pattern_img}}">         {% endverbatim %} 

model has {{vio.pdb_pid}} value:

class orcpattern(models.model):    pdb_id = models.integerfield(null=true, blank=true) 

model of other table:

class siverifyverificationsite(models.model):  pattern_id = models.integerfield(null=true, blank=true) 

my first line in code.i.e. if statement incomplete. value {{vio.pdb_pid}} should checked on table called sivorcdds(the field name in table pdb). precisely, if {{vio.pdb_pid}} exists in pattern_id.siverifyverificationsite(fieldname.tablename)` should display image in code. don't know how this. i'm new coding. appreciated.

note: 2 models of different applications.