Opened 4 years ago. Last modified 4 months ago. I'm not positive this is something which should live in Django, but if not, we could probably at least add some guidance to the docs about how to go about it. If we do add it, it likely needs a discussion on the DevelopersMailingList to figure out what the API should look like.

See also which asks for a template tag for creating query strings in templates. IMHO creating a new tag which accept a dictionary or list of tuples will practically serve the purpose. As per my comment on :. Replying to spookylukey :. I would like to see a solution in django core. I guess the django core developers don't want to pull in a dependency of one of the above packages. If urlencode would support unicode, the fix would be trival. But even with the current urlencode of Python 2.

Replying to guettli :. Unfortunatley urlencode get fails if the dictionary get contains unicode. I closed as a duplicate -- it suggests adding query and fragment parameters to reverse. Any update on this guys? Why a MUST have simple feature like this should take two years to implement? Please consider that you're expressing your frustration in a way that's unlikely to motivate volunteers to work for free for you.

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It feels more like this is missing from core rather than an enhancement. A URL can be with a query string or without a query string, the same goes also for fragment and in any case all URLs are assumed to be valid. Having this in mind, it makes sense that url tag should handle all the above cases by default. That way, it would provide a robust and unified solution for URL creation, maybe with auto escape features.

That way, it is backwards compatible while also wrapping a whole new world. Django is a registered trademark of the Django Software Foundation. Django The web framework for perfectionists with deadlines.

Opened 4 years ago Last modified 4 months ago.

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Description It is a common question on stackoverflow and other places: How to reverse to url including GET parameters? It would be useful for python code and template, too. Oldest first Newest first Threaded. Show comments Show property changes. The question is if it will be handy in django core.

The reason is explained in the comment just above yours. Last edited 19 months ago by Charalampos Tsimpouris previous diff. Note: See TracTickets for help on using tickets. Daniel Rios. Core URLs.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I can't find much about building a Django query that will handle boolean queries like that though.

I don't really know where to start. I'm running MySQL on the backend too. Thanks for any help! I'm trying to avoid doing a raw sql search in Django. I'm currently searching for things that can either convert any MySQL query to the appropriate Django query or ways to take a string and build a Django query directly from the string the parenthesis are the hard part I think.

I assume that you have a set values stored in database, which are boolean values. If so, take a look at pyparsing. You could use simple string substitution to make the query parsable and build an expression.

Then you can substitute variables with values fetched from database and evaluate it. Worth to mention, building query from user input could expose you to SQL injections and this solution is free of such danger.

I found an answer in pyparsing and a script called simpleBool which let me send a string from my HTML textarea of the format from my question to Django and I was able to make Q objects that way.

How are we doing? Please help us improve Stack Overflow. Take our short survey. Learn more. Asked 4 years, 10 months ago. Active 4 years, 10 months ago. Viewed times. Active Oldest Votes.

Do you mean are the items I am searching for boolean values? I have an extremely large database and I'm doing a string search for each word the user added to the string ex: "wordOne OR wordTwo AND wordThree" and returning a string. I've expanded my original question to add more detail.

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Does anyone know how to do convert from a string to a boolean in Python? I found this link. But it doesn't look like a proper way to do it.

Build Better Boolean Search Strings

The reason I'm asking this is because I learned about int "string" from here. But when trying bool "string" it always returns True :. Really, you just compare the string to whatever you expect to accept as representing true, so you can do this:. Empty strings evaluate to Falsebut everything else evaluates to True. So this should not be used for any kind of parsing purposes. True values are y, yes, t, true, on and 1; false values are n, no, f, false, off and 0.

Raises ValueError if val is anything else. You could also make your function explicitly check against a True list of words and a False list of words. Then if it is in neither list, you could throw an exception.

Which seems to work, as long as you're sure your strings are going to be either "True" or "False" :.

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I wouldn't normally recommend this, but it is completely built-in and could be the right thing depending on your requirements. If you know the string will be either "True" or "False"you could just use eval s. Only use this if you are sure of the contents of the string though, as it will throw an exception if the string does not contain valid Python, and will also execute code contained in the string.

This version keeps the semantics of constructors like int value and provides an easy way to define acceptable string values.

django query string boolean

Here's is my version. It checks against both positive and negative values lists, raising an exception for unknown values. And it does not receive a string, but any type should do.

This is just another way to do it without having to do an actual function call. If this is too wide, it can be refined by testing the type result. If the yaml-returned type is a str, then it can't be cast to any other type that I can think of anywayso you could handle that separately, or just let it be true. I won't make any guesses at speed, but since I am working with yaml data under Qt gui anyway, this has a nice symmetry. I don't agree with any solution here, as they are too permissive.

This is not normally what you want when parsing a string. The point is that you don't want to test for only one value and assume the other. I don't think you always want to map Absolutely everything to the non parsed value.

That produces error prone code. It's really easy to tailor this method to the exact conversion behavior you want -- you can fill it with allowed Truthy and Falsy values and let it raise an exception or return None when a value isn't found, or default to True, or default to False, or whatever you want.

But in production if you don't need ansible and all its dependencies, a good idea is to look at its source code and copy part of the logic that you need.

The usual rule for casting to a bool is that a few special literals False00. You can simply use the built-in function eval :. If it gets a string it expects specific values, otherwise raises an Exception. If it doesn't get a string, just lets the bool constructor figure it out.

Tested these cases:.Booleans represent one of two values: True or False. In programming you often need to know if an expression is True or False. You can evaluate any expression in Python, and get one of two answers, True or False. When you compare two values, the expression is evaluated and Python returns the Boolean answer:. When you run a condition in an if statement, Python returns True or False :.

Print a message based on whether the condition is True or False :.

django query string boolean

The bool function allows you to evaluate any value, and give you True or False in return. Almost any value is evaluated to True if it has some sort of content. Any number is Trueexcept 0. Any list, tuple, set, and dictionary are Trueexcept empty ones. And of course the value False evaluates to False. Python also has many built-in functions that returns a boolean value, like the isinstance function, which can be used to determine if an object is of a certain data type:. If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail:.

Example Evaluate a string and a number: print bool "Hello" print bool Example The following will return True: bool "abc" bool bool ["apple", "cherry", "banana"].

Example Print "YES! Exercise: The statement below would print a Boolean value, which one? HOW TO. Your message has been sent to W3Schools. W3Schools is optimized for learning, testing, and training. Examples might be simplified to improve reading and basic understanding. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content.

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Become an author. Python has several built-in functions associated with the string data type. These functions let us easily modify and manipulate strings.

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We can think of functions as being actions that we perform on elements of our code. Built-in functions are those that are defined in the Python programming language and are readily available for us to use.

The functions str. Because strings are immutable data types, the returned string will be a new string. Any characters in the string that are not letters will not be changed. The str.

That way if a user writes their name all lower case, we can still determine whether their name is in our database by checking it against an all upper-case version, for example. Python has some string methods that will evaluate to a Boolean value. These methods are useful when we are creating forms for users to fill in, for example. If we are asking for a post code we will only want to accept a numeric string, but when we are asking for a name, we will only want to accept an alphabetic string.

Using the str. Checking whether characters are lower case, upper case, or title case, can help us to sort our data appropriately, as well as provide us with the opportunity to standardize data we collect by checking and then modifying strings as needed. Boolean string methods are useful when we want to check whether something a user enters fits within given parameters. The string function len returns the number of characters in a string. This method is useful for when you need to enforce minimum or maximum password lengths, for example, or to truncate larger strings to be within certain limits for use as abbreviations.

We then passed the method into the print method so that we could see the output on the screen from our program. Keep in mind that any character bound by single or double quotation marks — including letters, numbers, whitespace characters, and symbols — will be counted by the len function.

We will see that in the new string that is returned there is added space throughout the first string:. We can also use the str. We did not want to add any part of another string to the first string, so we kept the quotation marks touching with no space in between.

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If we want to add a comma and a space between string values in our new string, we can simply rewrite our expression with a whitespace after the comma: ", ". Just as we can join strings together, we can also split strings up.

To do this, we will use the str. We can also use str.

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Now the letter a has been removed and the strings have been separated where each instance of the letter a had been, with whitespace retained. Since Sammy no longer has this balloon, we will change the substring "has" from the original string balloon to "had" in a new string:. Within the parentheses, the first substring is what we want to be replaced, and the second substring is what we are replacing that first substring with.

Our output will look like this:.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time.

django query string boolean

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I wanted to print some success messages from get method back to the index page home. I have redirected to the index page using.

I have searched for the solution and found that " django. But i did not find the place to add it. I am currently using python 2. I'm not sure I understand the question, but you can access the querystring in your view with request. So you could adjust the view that renders home. Something like. If there's a specific key in the querystring you can get the value with request.

Learn more. Display query string values in django templates Ask Question. Asked 7 years, 1 month ago. Active 7 years, 1 month ago. Viewed 10k times.

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Please suggest the appropriate solution. Thanks in advance. Active Oldest Votes. Francis Yaconiello Francis Yaconiello 9, 2 2 gold badges 28 28 silver badges 52 52 bronze badges. GET return render request, 'home.

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The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. From what you've posted, everything is working as advertised. If you try this stuff from the shell, you should get the following results.

How to Filter Rows of Pandas Dataframe with Query function?

Of course I'm making some of it up, so read before you just copy-paste. I think this happened during schema upgrades and migration in my dev environment so am not too worried about it. I had the same problem. My solution was to change the type of the column from a 'bit' to a 'tinyint'. Learn more. Asked 8 years, 8 months ago. Active 3 years, 10 months ago. Viewed 25k times.

This has been frustrating me for the better part of an hour. John Peebles John Peebles 1 1 gold badge 2 2 silver badges 8 8 bronze badges. How did you insert the data into your database?

A value of 1 commonly evaluates to True. So it looks to me like the data in your database is corrupt. Aug 3 '11 at This is going to go down as one of the most idiotic Stackoverflow questions ever, but with Textmate I was editing another view than the one I was viewing via the webapp. Everything works perfectly and I'm truly sorry for wasting everyone's time. Active Oldest Votes.