Why is my function not printing anything in the CLI? - python-3.x

Question

At the moment I am just trying to get the function to print what it has found in
the database, however I am not getting anything in the CLI when submitting
eywords via a form which has this functions URL as an action.
import os
from flask import Flask, render_template, redirect, request, url_for
from flask_pymongo import PyMongo
from bson.objectid import ObjectId
app = Flask(__name__)
app.config["MONGO_DBNAME"] = 'recipe_site'
app.config["MONGO_URI"] = os.getenv("MONGO_URI")
mongo = PyMongo(app)
#function for search bar.
#app.route('/search', methods=['GET', 'POST'])
def search():
mongo.db.recipes.create_index( { "name": "text" } )
if request.method == "POST":
q = request.form['search']
else:
q = ""
query = ( { "$text": { "$search": q } } )
results = mongo.db.recipes.find(query)
return render_template('searchresults.html', recipes = results)
The form that calls search function and captures key search word:
<form action="{{ url_for('search', text=text) }}" method="POST">
<div>
<div class="input-field">
<input id="search" name="search" type="text" class="validate">
<span class="helper-text" data-error="Try again" data-success="Done"></span>
</div>
</div>
<button type="submit">Submit </button>
</form>
Error code
Debugger PIN: 272-267-243
10.240.1.220 - - [25/May/2019 19:24:14] "POST /search/ HTTP/1.1" 404 -
As the code stands now all I expect is that it should print any collections in my database which have the keyword searched using the form.

Answer 1

You need to read the key words received from the post request using request.form['search']
like below:
#function for search bar.
#app.route('/search', methods=['GET', 'POST'])
def search():
# index for field name
mongo.db.recipes.create_index('name')
# index for field name and example
#mongo.db.recipes.create_index([("name", pymongo.DESCENDING),
#("example", pymongo.ASCENDING)])
if request.method == "POST":
q=request.form['search']
else:
q = ""
query = ( { "$text": { "$search": q } } )
results = mongo.db.recipes.find(query)
print (results)
return render_template('searchresults.html', recipes = results)
In the form, you need to replace
<form action="{{ url_for('search', text=text) }}" method="POST">
By
<form action="{{ url_for('search') }}" method="POST">
Edit:
I suggest to use GET method instead of POST for search feature because when the client refresh the browser, it ask him to confirm Form submission. So we need to replace:
if request.method == "POST":
q=request.form['search']
else:
q = ""
By
q = request.args.get('search', "")
And
<form action="{{ url_for('search') }}" method="POST">
by
<form action="{{ url_for('search') }}" method="GET">

Answer 2

Using the official documentation for PyMongo
Here is a tested code that might help.
from flask import Flask
from flask_pymongo import PyMongo
import pymongo
app = Flask(__name__)
app.config["MONGO_DBNAME"] = 'test'
app.config["MONGO_URI"] = "mongodb+srv://<username>:<password>#cluster0-vhd1j.gcp.mongodb.net/test?retryWrites=true"
mongo = PyMongo(app)
# mongo.db.collection.create_index([("name", pymongo.ASCENDING),("text", pymongo.ASCENDING)])
mongo.db.collection.insert_one({"name":"myname","text":"abcd"})
query = { "text": "abcd"}
results = mongo.db.collection.find(query)
for result in results:
print(result)
you can manipulate it as per your requirement. :)
I hope it helps.

Answer 3

Thank you for your attempts to support but I have now rectified the issue. The reason why nothing was printing in the cli was due the there being an issue with the create_index line. There was an existing index within that collection i was unaware of which was preventing this line from running.