rails polymorphism problem: I now have questions , articles , comments three models, one question corresponds to multiple comments , and a article corresponds to multiple comments . Now how to submit comments under question ? my model...
suppose that ABCD class, BC virtual inheritance from AMagle D inherited from BC,A class virtual function (not overridden at the same time in BC) and member variables belong to the internal of the class, if both of them solve the ambiguity, it can be solv...
for example, the POST request interface is specified, but a request from GET will report an error as shown in the following figure so how do you customize the returned errors? For example, { "error ": "Method not allowed "} is returned. ...
used to write this all the time, but recently it suddenly didn t work. Ask the boss for advice ...
the desired effect is as follows: d3stacked bar chart: the color of the two different columns is the same. The code can see here . The question is, how can I create the kind of bar chart that I want, each column has a different color ? Thank you...
Table 1 add column matching Table 2 key _ word, if Table 1 add contains Table 2 key_word, write group, in Table 1 column 4, if not, mark "not included ". PS: I also measured with iteration, Cartesian product also tried, but did not achieve the desired ...
for example, how to change the rule so that his first line is not blank, and let vscode format it according to the specified requirements ...