diff --git a/paramecio/citoplasma/plugins.py b/paramecio/citoplasma/plugins.py
new file mode 100644
index 0000000..9d9981b
--- /dev/null
+++ b/paramecio/citoplasma/plugins.py
@@ -0,0 +1,101 @@
+from paramecio.modules.admin.models.admin import UserAdmin
+from bottle import request
+from paramecio.citoplasma.sessions import get_session
+from paramecio.citoplasma.urls import redirect, make_url
+import inspect
+
+class LoginPlugin(object):
+
+    name = 'login'
+    api = 2
+    
+    def __init__(self, keyword='login'):
+        
+        self.keyword=keyword
+
+        
+    def setup(self, app):
+        ''' Make sure that other installed plugins don't affect the same keyword argument.'''
+        for other in app.plugins:
+            if not isinstance(other, LoginPlugin): continue
+            if other.keyword == self.keyword:
+                raise PluginError("Found another login plugin with "\
+                "conflicting settings (non-unique keyword).")
+
+    def apply(self, callback, context):
+
+        # Test if the original callback accepts a 'db' keyword.
+        # Ignore it if it does not need a login handle.
+        
+        conf = context.config.get('login') or {}
+        
+        keyword = conf.get('keyword', self.keyword)
+        
+        args = inspect.getfullargspec(context.callback)[0]
+
+        if keyword not in args:
+            return callback
+        
+        def wrapper(*args, **kwargs):
+
+            s=get_session()
+            
+            if 'login' in s:
+                """
+                if not s.get('usertpv_confirmed_email', 0):
+                    redirect('check_email')                        
+                else:
+                """
+                #s.save()
+                
+                #conn.close()
+
+                rv = callback(*args, **kwargs)
+                
+                return rv
+            
+            else:
+                #Check if remember_login cookie
+                #, secret=config.key_encrypt
+                """
+                remember_cookie=request.get_cookie("remember_me")
+                
+                if remember_cookie:
+                    
+                    if remember_cookie!='':
+                    
+                        conn=WebModel.connection()
+                        
+                        user=UserAdmin(conn)
+                        
+                        arr_user=user.set_conditions('WHERE token_login=%s', [remember_cookie]).select_a_row_where()
+
+                        error=True
+                        
+                        if arr_user:
+                            
+                            tz=arr_user['timezone']
+                            
+                            try:
+                                timezone(tz)
+                                
+                            except:
+                                tz='Europe/Madrid'
+                                
+                            
+                            s['usertpv_timezone']=tz
+                            
+                            error=False
+                            
+                            s.save()
+                        
+                        conn.close()
+                    
+                    if not error:
+                        redirect(config.base_url[:len(config.base_url)-1]+request.path)                        
+                        
+                """
+                redirect(make_url('login'))
+            
+        # Replace the route callback with the wrapped one.
+        return wrapper
diff --git a/paramecio/cromosoma/extrafields/parentfield.py b/paramecio/cromosoma/extrafields/parentfield.py
index 464517b..dfb97f8 100644
--- a/paramecio/cromosoma/extrafields/parentfield.py
+++ b/paramecio/cromosoma/extrafields/parentfield.py
@@ -34,6 +34,7 @@ class ParentField(IntegerField):
                     if model_id==value:
                         self.error=True
                         self.txt_error='A field cannot be its own father'
+                        self.required=True
                         value=0
                         return value
                         
diff --git a/paramecio/cromosoma/querybuilder.py b/paramecio/cromosoma/querybuilder.py
index bde9c3c..a45454f 100644
--- a/paramecio/cromosoma/querybuilder.py
+++ b/paramecio/cromosoma/querybuilder.py
@@ -291,7 +291,7 @@ def select_a_row(model, id, fields_selected=[], raw_query=0):
 
 def select_count(model, conditions=['', []], field_to_count='id', raw_query=True):
     
-    
+    print(model.dummy)
     #First table selecction
     
     tables_to_select=['`'+model.name+'`']
diff --git a/paramecio/cromosoma/webmodel.py b/paramecio/cromosoma/webmodel.py
index 19e7c57..3e0825d 100644
--- a/paramecio/cromosoma/webmodel.py
+++ b/paramecio/cromosoma/webmodel.py
@@ -180,7 +180,7 @@ class PrimaryKeyField(PhangoField):
         super(PrimaryKeyField, self).__init__(name, size, required)
         self.protected=True
         self.name_form=HiddenForm
-        self.required=True
+        self.required=False
         self.error_default="The value is zero"
     
     def check(self, value):
@@ -403,7 +403,8 @@ class WebModel:
         
         self.fields[field_model.name].model=self
         
-        self.fields[field_model.name].required=required
+        if required:
+            self.fields[field_model.name].required=required
         
         self.fields[field_model.name].post_register()
         
@@ -462,7 +463,7 @@ class WebModel:
         
         self.query_error=''
         
-        self.fields[self.name_field_id].required=False
+        #self.fields[self.name_field_id].required=False
         
         try:
             
@@ -507,7 +508,7 @@ class WebModel:
         
         # Connect to db
         
-        self.fields[self.name_field_id].required=False
+        #self.fields[self.name_field_id].required=False
         
         if self.name_field_id in dict_values:
             del dict_values[self.name_field_id]
diff --git a/paramecio/index.py b/paramecio/index.py
index d1b36dd..11e7253 100644
--- a/paramecio/index.py
+++ b/paramecio/index.py
@@ -72,7 +72,9 @@ def prepare_app():
         
         app.install(ErrorReportingPlugin())
         
-
+    if hasattr(config, 'plugins_app'):
+        for p in config.plugins_app:
+            app.install(p())
 
 # Clean last slash