Insert Array of JSONB with Sqlalchemy in postgresql

I have an issue with inserting array of JSONB in postgresql. The issue is related to Issue with Sqlalchemy and inserting array of jsonb to postgresql but there is no answer yet.

Following the indications of http://docs.sqlalchemy.org/en/latest/dialects/postgresql.html#using-json-jsonb-with-array, the column is defined of type :

myKeyOfJsonbArray=db.Column(CastingArray(JSONB)) 

with the class :

class CastingArray(ARRAY):
    def bind_expression(self, bindvalue):
        return cast(bindvalue, self)

I redefine the init function as:

def __init__(self, attributes):
    for key in attributes:
        if key==myKeyOfJsonbArray:
            temp=[]
            for object in attributes[key]:
                temp.append(object)
            print str(temp)
            setattr(self,key,temp)
        else : 
            ...

The print statement prints well the array :
[{u'price_list_id': u'retail', u'value': u'10.0'}]

but psycopg2 returns can't adapt type 'dict' when trying to set the attribute.

a cast temp.append(cast(object,JSONB)) return can't adapt type 'Cast'... I tried tons of solution (eg. with jsonb_build_object) but I can't figured it out. Please if someone already met this problem! Thank you!

EDIT

as the line

psycopg2.extensions.register_adapter(dict, psycopg2.extras.Json)

seemed to did the trick, a more complex dict still cause a problem.