From flask docs: [Flask&#39;s Context Processors][1]

&gt; To inject new variables automatically into the context of a template,
&gt; context processors exist in Flask. Context processors run before the
&gt; template is rendered and have the ability to inject new values into
&gt; the template context. A context processor is a function that returns a
&gt; dictionary. The keys and values of this dictionary are then merged
&gt; with the template context, for all templates in the app:

Example from docs:

    @app.context_processor
    def inject_user():
        return dict(user=g.user)

Note that this example uses the `g` variable, which is already accessible in templates.
[1]: https://flask.palletsprojects.com/en/1.1.x/templating/#context-processors

I have a MultiModule gradle project that I am trying to configure.  


    Root
        projA
        projB
        other
            projC
            projD
            projE
            ...

What I want to be able to do is have a task in the root build.gradle which will execute the buildJar task in each of the projects in the other directory.

I know I can do 

    configure(subprojects.findAll {it.name != &#39;tropicalFish&#39;}) {
        task hello &lt;&lt; { task -&gt; println &quot;$task.project.name&quot;}
    }

But this will also get projA and projB,  I want to only run the task on c,d,e...
Please let me know the best way to achieve this.
            

Execute gradle task on sub projects

I have the HQL where I trying to get artifacts that have no classification (when active is 0)

    artifacts = Artifact.findAll(&quot;FROM Artifact WHERE id NOT IN ( SELECT artifact_id FROM Classification WHERE active = 1) AND document_id = :docid&quot;,[docid:document.id], [max:limit, offset:startIndex]);
    							
Whenever I run I get the error



    java.lang.IllegalStateException: No data type for node: org.hibernate.hql.internal.ast.tree.IdentNode 
     \-[IDENT] IdentNode: &#39;artifact_id&#39; {originalText=artifact_id}
   
Classificaiton definition:

    class Classification {
    
        public static final String USER_DEFAULT = &quot;USER&quot;
        public static final String USER_SYSTEM = &quot;SYSTEM&quot;
    
        TaxonomyNode node
        String artifactId 
        Boolean active
        String createdBy
        String updatedBy
        Date dateCreated
        Date lastUpdated
       
    
        static constraints = {
            node nullable:false, blank:false
            artifactId nullable:false, blank:false, unique: [&#39;node&#39;]
            active nullable: false, blank: false
            createdBy nullable:false, blank:false
            updatedBy nullable:false, blank:false
        }
    
        static mapping = {
            id generator:&#39;sequence&#39;, params:[sequence:&#39;classification_seq&#39;]
            artifactId index: &#39;classify_by_artifact_node&#39;
            node index: &#39;classify_by_artifact_node&#39;
            active defaultValue: &quot;1&quot;
        }
    }
You can refer to previous problems I faced to understand what exactly I am trying to do [Quest 1][1] and [Quest 2][2]


  [1]: https://stackoverflow.com/questions/26469285/sql-to-hql-query-grails
  [2]: https://stackoverflow.com/questions/26467420/how-to-check-null-or-not-valid-in-hql-query

No data type for node: org.hibernate.hql.internal.ast.tree.IdentNode HQL

I have a method that returns data which is needed in my base template (content for a global footer).

How do either (1) pass a variable into the base template (which other templates extend) or (2) pass a variable to all templates globally without explicitly adding it in a call to `render_template`?

Flask + Jinja: Pass Data to a Base Template/All Templates

<p>I have a method that returns data which is needed in my base template (content for a global footer).</p>
<p>How do either (1) pass a variable into the base template (which other templates extend) or (2) pass a variable to all templates globally without explicitly adding it in a call to <code>render_template</code>?</p>


I&#39;m trying to add logging to a web application which uses Flask.

When hosted using the built-in server (i.e. `python3 server.py`), logging works. When hosted using Gunicorn, the log file is not created.

The simplest code which reproduces the problem is this one:

    #!/usr/bin/env python

    import logging
    from flask import Flask
    flaskApp = Flask(__name__)


    @flaskApp.route(&#39;/&#39;)
    def index():
        flaskApp.logger.info(&#39;Log message&#39;)
        print(&#39;Direct output&#39;)
        return &#39;Hello World\n&#39;


    if __name__ == &quot;__main__&quot;:
        logHandler = logging.FileHandler(&#39;/var/log/demo/app.log&#39;)
        logHandler.setLevel(logging.INFO)
        flaskApp.logger.addHandler(logHandler)
        flaskApp.logger.setLevel(logging.INFO)
        flaskApp.run()

The application is called using:

    gunicorn server:flaskApp -b :80 -w 4
        --access-gfile /var/log/demo/access.log
        --error-logfile /var/log/demo/error.log

When doing a request to the home page of the site, the following happens:

 1. I receive the expected HTTP 200 &quot;Hello World\n&quot; in response.

 1. There is a trace of the request in `/var/log/demo/access.log`.

 1. `/var/log/demo/error.log` stays the same (there are just the boot events).

 1. There is the &quot;Direct output&quot; line in the terminal.

 1. There is no &#39;/var/log/demo/app.log&#39;. If I create the file prior to launching the application, the file is not modified.

Note that:

 - The directory `/var/log/demo` can be accessed (read, write, execute) by everyone, so this is not the permissions issue.

 - If I add `StreamHandler` as a second handler, there is still no trace of the &quot;Log message&quot; message neither in the terminal, nor in Gunicorn log files.

 - Gunicorn is installed using `pip3 install gunicorn`, so there shouldn&#39;t be any mismatch with Python versions.

What&#39;s happening?

Why is Flask application not creating any logs when hosted by Gunicorn?

I&#39;m trying to understand how best to redirect and pass arguments using Flask

Below is my code, I&#39;m finding that `x` and `y` are not making it into the template.

Is my syntax correct? Am I missing something basic? I am able to render the template, but I want to redirect to the url `/found`, rather than just returning the template for `find.html`



	@app.route(&#39;/found&#39;)
	def found(email,listOfObjects):
	  return render_template(&quot;found.html&quot;,
	      keys=email,obj=listOfObjects)
	  
	@app.route(&#39;/find&#39;, methods=[&#39;GET&#39;,&#39;POST&#39;])
	def find():
		if request.method == &#39;POST&#39;:
			x = 3
			y = 4
			return redirect(url_for(&#39;found&#39;,keys=x,obj=y))

		return render_template(&quot;find.html&quot;)


How can I pass arguments into redirect(url_for()) of Flask?

For the following `ajax` post request for `Flask` (https://stackoverflow.com/questions/14908864/how-can-i-use-data-posted-from-ajax-in-flask):

	$.ajax({
		url: &quot;http://127.0.0.1:5000/foo&quot;, 
		type: &quot;POST&quot;,
		contentType: &quot;application/json&quot;,
		data: JSON.stringify({&#39;inputVar&#39;: 1}),
		success: function( data ) { 
			alert( &quot;success&quot; + data );
		}	
	});


I get a [`Cross Origin Resource Sharing (CORS)`](https://stackoverflow.com/questions/20035101/no-access-control-allow-origin-header-is-present-on-the-requested-resource) error:

    No &#39;Access-Control-Allow-Origin&#39; header is present on the requested resource. 
    Origin &#39;null&#39; is therefore not allowed access. 
    The response had HTTP status code 500.

I tried solving it in the two following ways, but none seems to work.

 1. **Using Flask-CORS**

This is a `Flask` extension for handling `CORS` that should make cross-origin AJAX possible.

 - http://flask-cors.readthedocs.org/en/latest/
 - https://stackoverflow.com/questions/25594893/how-to-enable-cors-in-flask-and-heroku
 - https://stackoverflow.com/questions/24827857/flask-cors-wrapper-not-working-when-jwt-auth-wrapper-is-applied
 - https://stackoverflow.com/questions/22181384/javascript-no-access-control-allow-origin-header-is-present-on-the-requested

My *pythonServer.py* using this solution:

    from flask import Flask
    from flask.ext.cors import CORS, cross_origin
    
    app = Flask(__name__)
    cors = CORS(app, resources={r&quot;/foo&quot;: {&quot;origins&quot;: &quot;*&quot;}})
    app.config[&#39;CORS_HEADERS&#39;] = &#39;Content-Type&#39;
    
    @app.route(&#39;/foo&#39;, methods=[&#39;POST&#39;,&#39;OPTIONS&#39;])
    @cross_origin(origin=&#39;*&#39;,headers=[&#39;Content-Type&#39;,&#39;Authorization&#39;])
    def foo():
    	return request.json[&#39;inputVar&#39;]
        
    if __name__ == &#39;__main__&#39;:
        app.run()

 2. **Using specific Flask Decorator**

This is an *official* Flask code snippet defining a decorator that should allow `CORS` on the functions it decorates.

 - http://flask.pocoo.org/snippets/56/
 - https://stackoverflow.com/questions/16241588/python-flask-cross-site-http-post-doesnt-work-for-specific-allowed-origins
 - http://chopapp.com/#351l7gc3

My *pythonServer.py* using this solution:

    from flask import Flask, make_response, request, current_app
    from datetime import timedelta
    from functools import update_wrapper
    
    app = Flask(__name__)
    
    def crossdomain(origin=None, methods=None, headers=None,
                    max_age=21600, attach_to_all=True,
                    automatic_options=True):
        if methods is not None:
            methods = &#39;, &#39;.join(sorted(x.upper() for x in methods))
        if headers is not None and not isinstance(headers, basestring):
            headers = &#39;, &#39;.join(x.upper() for x in headers)
        if not isinstance(origin, basestring):
            origin = &#39;, &#39;.join(origin)
        if isinstance(max_age, timedelta):
            max_age = max_age.total_seconds()
    
        def get_methods():
            if methods is not None:
                return methods
    
            options_resp = current_app.make_default_options_response()
            return options_resp.headers[&#39;allow&#39;]
    
        def decorator(f):
            def wrapped_function(*args, **kwargs):
                if automatic_options and request.method == &#39;OPTIONS&#39;:
                    resp = current_app.make_default_options_response()
                else:
                    resp = make_response(f(*args, **kwargs))
                if not attach_to_all and request.method != &#39;OPTIONS&#39;:
                    return resp
    
                h = resp.headers
    
                h[&#39;Access-Control-Allow-Origin&#39;] = origin
                h[&#39;Access-Control-Allow-Methods&#39;] = get_methods()
                h[&#39;Access-Control-Max-Age&#39;] = str(max_age)
                if headers is not None:
                    h[&#39;Access-Control-Allow-Headers&#39;] = headers
                return resp
    
            f.provide_automatic_options = False
            return update_wrapper(wrapped_function, f)
        return decorator
    
    @app.route(&#39;/foo&#39;, methods=[&#39;GET&#39;,&#39;POST&#39;,&#39;OPTIONS&#39;])
    @crossdomain(origin=&quot;*&quot;)
    def foo():
    	return request.json[&#39;inputVar&#39;]
        
    if __name__ == &#39;__main__&#39;:
        app.run()

**Can you please give some some indication of why that is?**

Solve Cross Origin Resource Sharing with Flask

I have `users` table in my MySql database. This table has `id`, `name` and `age` fields.

How can I delete some record by `id`?

Now I use the following code:

    user = User.query.get(id)
    db.session.delete(user)
    db.session.commit()

But I don&#39;t want to make any query before delete operation. Is there any way to do this? I know, I can use `db.engine.execute(&quot;delete from users where id=...&quot;)`, but I would like to use `delete()` method.

How to delete a record by id in Flask-SQLAlchemy

When using sessions, Flask requires a secret key. In every example I&#39;ve seen, the secret key is somehow generated and then stored either in source code or in configuration file.

What is the reason to store it permanently? Why not simply generate it when the application starts?

    app.secret_key = os.urandom(50)

Why not generate the secret key every time Flask starts?

I have a python dictionary:

    settings = {
       &quot;foo&quot; : &quot;baz&quot;,
       &quot;hello&quot; : &quot;world&quot;
    }

This variable `settings` is then available in the Jinja2 template. 

I want to check if a key `myProperty` exists in the `settings` dict within my template, and if so take some action: 

    {% if settings.hasKey(myProperty) %}
       takeSomeAction();
    {% endif %}

What is the equivalent of `hasKey` that I can use?

Check if key exists in a Python dict in Jinja2 templates

I need to programatically distinguish between Jinja template files, other template files (such as ERB), and template-less plain text files.

According to [Jinja documentation]:

&gt; A Jinja template doesn’t need to have a specific extension: .html, .xml, or any other extension is just fine.

But what should I use when an explicit extension is required? `.py` is misleading, and any search including the words &quot;jinja&quot; and &quot;extension&quot; are badly searchwashed by discussion around [Jinja Extensions].

I could easily dictate a project-wide convention (`.jnj` or `.ja` come to mind) but this is for open source so I don&#39;t want to buck the trend if there&#39;s already established practice somewhere.

---
**EDIT 1:** Again, I understand that the Jinja project &amp;mdash; purposefully &amp;mdash; does not define a default file extension. I&#39;m asking if there are any unofficial conventions that have emerged for circumstances where one is desired for some project-specific reason.

---
**EDIT 2:** Clarification: This is not for HTML content.

[jinja documentation]: http://jinja.pocoo.org/docs/dev/templates/
[jinja extensions]: http://jinja.pocoo.org/docs/dev/extensions/

Is there an idiomatic file extension for Jinja templates?

I want to make a **for-loop** that goes from 0 to 10 in **Jinja**.  
 
How do I do it?   
All I know to do is the advanced for, but this does not help me now.



How to make a for loop in Jinja?

I have a list of list like : 

        [[elem0, elem1, elem2], [elem3, elem4, elem5], [elem6, elem7, elem8], ...]

I wrote the follow template file : 

        {% for result in results %}
            &lt;tr&gt;
                &lt;td&gt;result[0]&lt;/td&gt;
                &lt;td&gt;result[1]&lt;/td&gt;
                &lt;td&gt;result[2]&lt;/td&gt;
            &lt;/tr&gt;
        {% endfor %}

But it didn&#39;t work, What i can think is use nested for. Is there another method to access the element in the list in jinja?
 

how to iterate over a list of list in jinja

I have a Flask site and I want to use the AngularJS JavaScript framework.  Unfortunately, it seems as if the delimiters overlap.  

How do I use Angular with Jinja2 if both rely on double curly braces (`{{ expr }}`)?  Is it even possible?

Content Type	Original Author	Original Content on Stackoverflow
Question	okoboko	View Question on Stackoverflow
Solution 1 - Flask	Gohn67	View Answer on Stackoverflow

Flask + Jinja: Pass Data to a Base Template/All Templates

Flask Problem Overview

Flask Solutions

Solution 1 - Flask

No data type for node: org.hibernate.hql.internal.ast.tree.IdentNode HQL

Execute gradle task on sub projects

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