How selection works

Forum général et fonctionnel français
1

I have class ContactAddress.xml in domains

<entity name="ContactAddress">
        <many-to-one name="contact" ref="Contact" required="true" />
        <string name="street" required="true" max="255" />
        <!--<string name="area" max="255" />-->
        <string name="village" />
        <string name="area" />
        <string name="region" selection="contact.address.region.select"  />
        <string name="country" selection="contact.address.country.select"/>
    </entity>

How to link country fields with cities so that when you select a specific country, only its cities come out?

<selection name="contact.address.country.select" id="base.contact.address.country.select">
    <option value='KGS'>Kyrgyzstan</option>
    <option value="KZ">Kazakhstan</option>
  </selection>

  <selection name="contact.address.region.select" id="base.contact.address.region.select">
    <option value="0" >Bishkek</option>
    <option value="1" >Osh</option>
    <option value="2" >Batken</option>
    <option value="3" >Chuy</option>
    <option value="4" >Jalal-Abad</option>
    <option value="5" >Naryn</option>
    <option value="6" >Osh</option>
    <option value="7" >Talas</option>
    <option value="8" >Issyk-Kul</option>
    <option value="9" >Almaty</option>
  </selection>
2

You can’t, you need 3 entities/domain for this :
ContactAddress
Country (with string code, and string name)
City (with string code, and string name, string zip)

You need to create relationships between your lines
ContactAddress with :
many to one (country) to Country

many to one (city) to Country

now in your view, on the field, add a domain=« self.code == city.code » for example