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QUESTION
I would like to make a joins query but only if a condition is met.
In previous version of rails when find was used, I would be able to use:
...ANSWER
Answered 2021-Jun-15 at 14:09you can create a scope
that will check the condition
before joins
QUESTION
For example, when the entered url is
http://localhost:3000/course-details
it should always redirect to http://localhost:3000/courses
I remember there was a way to do that but I forgot it.
...ANSWER
Answered 2021-Jun-15 at 08:09you can handle this in the middleware of vue-page-component
pages/course-details.vue
QUESTION
Hey there stackoverflow
I am currently building a course application as part of my laravel project.
My problem lies in how the eloquent handle model relations, i'm still kinda new to eloquent, so hopefully you can answer my question.
The structure
The Course has many episodes and each episode has many sections.
Which means I have 3 tables in the DB. Courses -> course_episodes -> course_episode_sections
ID table is where i connect courses with users - course_users.
Right now i can create courses and and put in all the data correctly.
The Problem
I need to retrieve all the courses and its nested children that the user has bought, which is connected in the course_users table with columns course_id and user_id
Course structure
Same stucture in DB
...ANSWER
Answered 2021-Jun-14 at 15:14According to your explanation, course_users table holds many-to-many relationship between Course and User model. In case of a many-to-many relationship, you actually don't need a CourseUser model. This kind of table which holds many-to-many relationship is called pivot table. Read more from the Official Documentation
I am defining only the relationships with your Course, User, CourseEpisode, CourseEpisodeSection models.
Course.php
QUESTION
I need help.
I created a small mobile application with Kivy.
I have two screens: ScreenList and ScreenDetail.
However the screen(ScreenList) containing GridLayout does not refresh
ScreenList: contains a list of items
ScreenDetail: Contains the details of a single item.
How the app works:
- When I click on the first item on button 1
- I go to the details of the item.
- I modify the second field. I replace the text:
Firt element
forFirst and update data
- After recording, I redirect the application to the screens which contain (ScreenList) the list of elements.
- But the list of elements remains unchanged then the data has been modified in the database. 6.And when I return to the screen (ScreenDetail) which contains the details, there I see that the data is updated.
How can I refresh the item list in ScreenList?
Here are the pictures as an example
List before update
before update
after update
List after update
Here is the python code:
...ANSWER
Answered 2021-Jun-13 at 06:24When you're trying to share data in between screens, it's often useful to use
app
methods instead of specific methods of screens.And when you need to create lots of buttons, maybe inside a loop, and bind methods on its events(
on_press
,on_release
), it's often bad to create button instances on the fly and bind methods on its events because you'll need to do extra work to make sure that those bound methods are called with right parameters when events are fired. Rather create a custom class template and use that instead.
Created custom GridLayout:
QUESTION
I have written terraform code which:
- Creates IAM Role
- Creates lambda functions and attaches the above created role
- Dynamo DB table creation
- Creates API gateway, resources and adds POST method with lambda integration.
The first 3 steps works well. However while creating and configuring the API gateway, I am encountering below error in resource aws_api_gateway_integration & aws_lambda_permission, where I am trying to attach the lambda function "save_course" to the POST method under "courses" resource
...ANSWER
Answered 2021-Jun-12 at 22:21Change your locals from
QUESTION
I have below array I want to group by course id and course type (fulltime and parttime)
...ANSWER
Answered 2021-Jun-12 at 21:32This will give you the multi-dimensional array you want. If you don't want to lose those unset
variables comment out that line. It's just there because you didn't record them in your sample.
QUESTION
I am using a 3.5: TFT LCD display with an Arduino Uno and the library from the manufacturer, the KeDei TFT library. The library came with a bitmap font table that is huge for the small amount of memory of an Arduino Uno so I've been looking for alternatives.
What I am running into is that there doesn't seem to be a standard representation and some of the bitmap font tables I've found work fine and others display as strange doodles and marks or they display upside down or they display with letters flipped. After writing a simple application to display some of the characters, I finally realized that different bitmaps use different character orientations.
My questionWhat are the rules or standards or expected representations for the bit data for bitmap fonts? Why do there seem to be several different text character orientations used with bitmap fonts?
Thoughts about the questionAre these due to different target devices such as a Windows display driver or a Linux display driver versus a bare metal Arduino TFT LCD display driver?
What is the criteria used to determine a particular bitmap font representation as a series of unsigned char values? Are different types of raster devices such as a TFT LCD display and its controller have a different sequence of bits when drawing on the display surface by setting pixel colors?
What other possible bitmap font representations requiring a transformation which my version of the library currently doesn't offer, are there?
Is there some method other than the approach I'm using to determine what transformation is needed? I currently plug the bitmap font table into a test program and print out a set of characters to see how it looks and then fine tune the transformation by testing with the Arduino and the TFT LCD screen.
My experience thus farThe KeDei TFT library came with an a bitmap font table that was defined as
...ANSWER
Answered 2021-Jun-12 at 16:19Raster or bitmap fonts are represented in a number of different ways and there are bitmap font file standards that have been developed for both Linux and Windows. However raw data representation of bitmap fonts in programming language source code seems to vary depending on:
- the memory architecture of the target computer,
- the architecture and communication pathways to the display controller,
- character glyph height and width in pixels and
- the amount of memory for bitmap storage and what measures are taken to make that as small as possible.
A brief overview of bitmap fonts
A generic bitmap is a block of data in which individual bits are used to indicate a state of either on or off. One use of a bitmap is to store image data. Character glyphs can be created and stored as a collection of images, one for each character in the character set, so using a bitmap to encode and store each character image is a natural fit.
Bitmap fonts are bitmaps used to indicate how to display or print characters by turning on or off pixels or printing or not printing dots on a page. See Wikipedia Bitmap fonts
A bitmap font is one that stores each glyph as an array of pixels (that is, a bitmap). It is less commonly known as a raster font or a pixel font. Bitmap fonts are simply collections of raster images of glyphs. For each variant of the font, there is a complete set of glyph images, with each set containing an image for each character. For example, if a font has three sizes, and any combination of bold and italic, then there must be 12 complete sets of images.
A brief history of using bitmap fonts
The earliest user interface terminals such as teletype terminals used dot matrix printer mechanisms to print on rolls of paper. With the development of Cathode Ray Tube terminals bitmap fonts were readily transferable to that technology as dots of luminescence turned on and off by a scanning electron gun.
Earliest bitmap fonts were of a fixed height and width with the bitmap acting as a kind of stamp or pattern to print characters on the output medium, paper or display tube, with a fixed line height and a fixed line width such as the 80 columns and 24 lines of the DEC VT-100 terminal.
With increasing processing power, a more sophisticated typographical approach became available with vector fonts used to improve displayed text quality and provide improved scaling while also reducing memory required to describe the character glyphs.
In addition, while a matrix of dots or pixels worked fairly well for languages such as English, written languages with complex glyph forms were poorly served by bitmap fonts.
Representation of bitmap fonts in source code
There are a number of bitmap font file formats which provide a way to represent a bitmap font in a device independent description. For an example see Wikipedia topic - Glyph Bitmap Distribution Format
The Glyph Bitmap Distribution Format (BDF) by Adobe is a file format for storing bitmap fonts. The content takes the form of a text file intended to be human- and computer-readable. BDF is typically used in Unix X Window environments. It has largely been replaced by the PCF font format which is somewhat more efficient, and by scalable fonts such as OpenType and TrueType fonts.
Other bitmap standards such as XBM, Wikipedia topic - X BitMap, or XPM, Wikipedia topic - X PixMap, are source code components that describe bitmaps however many of these are not meant for bitmap fonts specifically but rather other graphical images such as icons, cursors, etc.
As bitmap fonts are an older format many times bitmap fonts are wrapped within another font standard such as TrueType in order to be compatible with the standard font subsystems of modern operating systems such as Linux and Windows.
However embedded systems that are running on the bare metal or using an RTOS will normally need the raw bitmap character image data in the form similar to the XBM format. See Encyclopedia of Graphics File Formats which has this example:
Following is an example of a 16x16 bitmap stored using both its X10 and X11 variations. Note that each array contains exactly the same data, but is stored using different data word types:
QUESTION
I am using react js for web front end and php for back end, on button click on web page i am trying to send data to server but getting this Error: Network Error at createError (createError.js:16) at XMLHttpRequest.handleError (xhr.js:84)
I have tried two different ways for sending data to server but with each i got the same error. can anyone help me out?
React Code:
...ANSWER
Answered 2021-Jun-12 at 05:57If you are using hostinger(000webhost) and you are making a website using react and PHP, you can use axios to retrieve data from server, you can't use axios to make a post request. If you will, you will he an http protocol error. So instead to axios use fetch(I repeat in case of 000webhost server). I have done the same thing with fetch like this
QUESTION
I'm trying to group the rows of my dataframe into "courses" when the same variables appear at regular date intervals. When there is a gap in time frequency or when one of variables change I would like to give it a new course ID.
To give an example, my data looks something like this:
...ANSWER
Answered 2021-Jun-10 at 16:18Here's a dplyr approach that calculates the gap and rolling avg gap within each Name/Item group, then flags large gaps, and assigns a new group for each large gap or change in Name or Item.
QUESTION
As here shows
...ANSWER
Answered 2021-Jun-09 at 21:28Const will define a object no reassignable but we can edit properties in the object. Using const won't change the structure of the object.
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