I must be doing something wrong
I'm trying to loop through all documents in a collection and add the contents to a dictionary.
I added the data to a dictionary, but my intention was to loop through all docs:
firebase_admin.initialize_app(cred)
db = firestore.client()
blog_col = db.collection(u'blog')
class Art_cont:
def __init__(self,title,date,link):
self.title = title
self.date = date
self.link = link
def getLast4():
query = blog_col.order_by("date").limit_to_last(4).get()
for doc in query: #Need to find a way to loop through all docs, this doesn't work
db_title=doc.to_dict()["title"]
db_date=doc.to_dict()["date"]
db_link=doc.to_dict()["link"]
content1=Art_cont(db_title,db_date,db_link)
#here wrap them up with html and return them to app
print(content1.title,content1.date,content1.link)
When I run that code it only gives me the first doc content:
Vs the other docs that have the same structure:
Any advice would be appreciated.
Assuming that query is an object of your model, write db_title = doc.your_attribute_name.to_dict()['title'] and do the same for the other attributes.
Well, I almost had it, I ended up creating a function instead:
def getlist(x):
query = blog_col.order_by("date").limit_to_last(4).get()
docs=[]
for doc in query:
docs.append(doc)
docnum=docs[x]
db_title=docnum.to_dict()["title"]
db_date=docnum.to_dict()["date"]
db_link=docnum.to_dict()["link"]
content=Art_cont(db_title,db_date,db_link)
return content
print(getlist(0).title)
print(getlist(1).title)
etc...
Hope this helps anyone in a similar situation.
Related
I am working a CRUD flask project that works with a 1-to-many relationship. The end result looks like this, Flask Webform. However when I submit the form for the Update route, it returns to the home page and displays this. Webform After Update.
Here is my DB model
def update(id):
frank = Frankendama.query.get(id)
form = FrankForm()
if form.validate_on_submit():
frank.title=form.title.data
frank.description=form.description.data
frank.tama=form.tama.data
frank.sarado=form.sarado.data
frank.sword=form.sword.data
frank.string=form.string.data
frank.bearing=form.bearing.data
db.session.add(frank)
db.session.commit()
comps = form.companies.data
comps_used = comps.split(",")
all_comps = Company.query.all().filter_by(Company.frankendama_id == id) #Error here
for entry in all_comps:
if entry.frankendama_id == id:
db.session.delete(entry)
for i in range(0, len(comps_used)):
new_entry = comps_used[i]
new_comp = Company(name=new_entry, frankendama_id=id)
db.session.add(new_comp)
db.session.commit()
return redirect(url_for("home"))
else:
return render_template("create.html", form=form)
I am trying to find a query for the Companies table that sorts for all rows with the foreign key 'frankendama_id' that is same to the main tables id. That way i can delete them and then re add them.
When i try using filter() or filter_by() i get the error AttributeError: 'list' object has no attribute 'filter_by'
I am really stumped, any suggestions are welcome! Thanks
move filter_by in front of .all()
all_comps = Company.query.filter_by(frankendama_id = id).all()
edit 1:
Also you can remove 'Company.' when using filter_by and you only need a single equals sign
I am trying to search a mongodb using pymongo as collection.find({},{"project": "IO80211"}) but the search doesnt seem to work
it seems to list all the rows in that collection,any guidance on why the search is not working?
try:
print("Trying to create tags...")
dbuser = os.environ.get('muser', 'techauto1')
dbpass = os.environ.get('mpwd', 'techpass')
uri = 'mongodb://{dbuser}:{dbpass}#techtechbot.scv.company.com:27017/techautomation'.format(**locals())
client = MongoClient(uri)
db = client.techautomation
collection = db['static_radars']
print ("going to for find..")
#cursor = collection.find({"project:%s"%project})
print(collection)
cursor = collection.find({},{"project": "IO80211"})
print ("going to forloop")
for document in cursor:
print('%s'%document)
except (pymongo.errors.AutoReconnect, e):
print('Warning %s'%e)
The first parameter is the query,
the second one is the projection,
as it says in the docs
So you can remove the first empty parameter and pass the query instead
cursor = collection.find({"project": "IO80211"})
Im have some data from my collection at mongoDb i want to see all data from specified collection let say i've simple code like this
from pymongo import MongoClient
url = 'my url'
client = MongoClient(url, ssl=True, retryWrites=True)
class DB(object):
def __init__(self):
self.db = client.mydb
self.col = self.db.mycol
def see_listed(self):
for i in self.col.find():
return i
db = DB()
print(db.see_listed())
That only returned one data from my collection
but if i changed code from see_listed to
for i in self.col.find():
print(i)
That return all of data from my collection,where my wrong i don't know.. I just read some documents at try like this.
Im so thankful for any help im appreciate
You only get one document since you use return in your see_listed function.
If you change the return to yield instead it should return a generator you can iterate through.
def see_listed(self):
for i in self.col.find():
yield i
But if you only want the data in a list you could do:
def see_listed(self):
return list(self.col.find())
Maybe not the best choice if the size of the data is unknown.
yield keyword: What does the "yield" keyword do?
I'm rather new to the whole ORM topic, and I've already searched forums and docs.
The question is about a flask application with SQLAlchemy as ORM for the PostgreSQL.
The __init__.py contains the following line:
db = SQLAlchemy()
the created object is referenced in the other files to access the DB.
There is a save function for the model:
def save(self):
db.session.add(self)
db.session.commit()
and also an update function:
def update(self):
for var_name in self.__dict__.keys():
if var_name is not ('_sa_instance_state' or 'id' or 'foreign_id'):
# Workaround for JSON update problem
flag_modified(self, var_name)
db.session.merge(self)
db.session.commit()
The problem occurs when I'm trying to save a new object. The save function writes it to DB, it's visible when querying the DB directly (psql, etc.), but a following ORM query like:
model_list = db.session.query(MyModel).filter(MyModel.foreign_id == this_id).all()
gives an empty response.
A call of the update function does work as expected, new data is visible when requesting with the ORM.
I'm always using the same session object for example this:
<sqlalchemy.orm.scoping.scoped_session object at 0x7f0cff68fda0>
If the application is restarted everything works fine until a new object was created and tried to get with the ORM.
An unhandsome workaround is using raw SQL like:
model_list = db.session.execute('SELECT * FROM models_table WHERE
foreign_id = ' + str(this_id))
which gives a ResultProxy with latest data like this:
<sqlalchemy.engine.result.ResultProxy object at 0x7f0cf74d0390>
I think my problem is a misunderstanding of the session. Can anyone help me?
It figured out that the problem has nothing to do with the session, but the filter() method:
# Neccessary import for string input into filter() function
from sqlalchemy import text
# Solution or workaround
model_list = db.session.query(MyModel).filter(text('foreign_key = ' + str(this_id))).all()
I could not figure out the problem with:
filter(MyModel.foreign_id == this_id) but that's another problem.
I think this way is better than executing raw SQL.
I'm working with Flask/Mongoengine-MongoDB for my latest web application.
I'm familiar with Pymongo, but I'm new to object-document mappers like Mongoengine.
I have a database and collection set up already, and I basically just want to query it and return the corresponding object. Here's a look at my models.py...
from app import db
# ----------------------------------------
# Taking steps towards a working backend.
# ----------------------------------------
class Property(db.Document):
# Document variables.
total_annual_rates = db.IntField()
land_value = db.IntField()
land_area = db.IntField()
assessment_number = db.StringField(max_length=255, required=True)
address = db.StringField(max_length=255, required=True)
current_capital_value = db.IntField
valuation_as_at_date = db.StringField(max_length=255, required=True)
legal_description = db.StringField(max_length=255, required=True)
capital_value = db.IntField()
annual_value = db.StringField(max_length=255, required=True)
certificate_of_title_number = db.StringField(max_length=255, required=True)
def __repr__(self):
return address
def get_property_from_db(self, query_string):
if not query_string:
raise ValueError()
# Ultra-simple search for the moment.
properties_found = Property.objects(address=query_string)
return properties_found[0]
The error I get is as follows: IndexError: no such item for Cursor instance
This makes complete sense, since the object isn't pointing at any collection. Despite trolling through the docs for a while, I still have no idea how to do this.
Do any of you know how I could appropriately link up my Property class to my already extant database and collection?
The way to link a class to an existing collection can be accomplished as such, using meta:
class Person(db.DynamicDocument):
# Meta variables.
meta = {
'collection': 'properties'
}
# Document variables.
name = db.StringField()
age = db.IntField()
Then, when using the class object, one can actually make use of this functionality as might be expected with MongoEngine:
desired_documents = Person.objects(name="John Smith")
john = desired_documents[0]
Or something similar :) Hope this helps!
I was googling this same question and i noticed the answer has changed since the previous answer:
According to the latest Mongoengine guide:
If you need to change the name of the collection (e.g. to use MongoEngine with an existing
database), then create a class dictionary attribute called meta on your document, and set collection to the
name of the collection that you want your document class to use:
class Page(Document):
meta = {'collection': 'cmsPage'}
The code on the grey did the trick and i could use my data instantly.