field

问题 In Matlab, assigning cell arrays to a struct arrays field foo is possible with my_array(1000).foo = []; [my_array.foo] = some_cell{:}; Now what I would like to do is assign a single value to all fields in the array. But whatever I tried, Matlab would return error messages instead of silently assuming that if I want to assign a single element of size [1x1] , it should be assigned to all fields. I would be happy if I could simply say e.g.: my_array.foo = pi; ??? Incorrect number of right hand

问题 I don't want to use django's built in form generation, seeking to specify each field in my template in order to customize the html output. How do I iterate over a series of form fields? If my form looks like this: class MyForm(forms.Form): main_image = forms.ImageField() second_image = forms.ImageField() third_image = forms.ImageField() fourth_image = forms.ImageField() ... Is there way to write a {% for %} loop so that I can iterate through: {{ form.main_image }} {{ form.second_image }} {{

问题 I'm beginner in Django/Python and I need to create a multiple select form. I know it's easy but I can't find any example. I know how to create a CharField with a widget but I get confused of all the options inside fields.py. For example I don't know which one of the followings is best for a multiple select form. 'ChoiceField', 'MultipleChoiceField', 'ComboField', 'MultiValueField', 'TypedChoiceField', 'TypedMultipleChoiceField' And here is the form I need to create. <form action="" method=

问题 I'm using the code below to print the out the field of nodes to specific areas and it works great. But theres an instance where I just want to print the value you of field without the label. Seems as it should be pretty easy but I'm having a bit of trouble. I'd appreciate any help as i'm pretty new to drupal. Thanks <?php print drupal_render(field_view_field('node', $node, 'field_description')); ?> 回答1: field_view_value() takes a $display argument that you can use to hide the label: $display

问题 I'd like to have access to one my model field verbose_name. I can get it by the field indice like this model._meta._fields()[2].verbose_name but I need to get it dynamically. Ideally it would be something like this model._meta._fields()['location_x'].verbose_name I've looked at a few things but I just can't find it. 回答1: For Django < 1.10: model._meta.get_field_by_name('location_x')[0].verbose_name 回答2: model._meta.get_field('location_x').verbose_name 回答3: For Django 1.11 and 2.0: MyModel.

问题 I apologise if this has been asked before, but I can't seem to find an answer to a question that I have about calculating on the fly vs storing fields in a database. I read a few articles that suggested it was preferable to calculate when you can, but I would just like to know if that still applies to the following 2 examples. Example 1. Say you are storing data relating to a car. You store the fuel tank size in litres, and how many litres it uses per 100km. You also want to know how many KMs

问题 I apologise if this has been asked before, but I can't seem to find an answer to a question that I have about calculating on the fly vs storing fields in a database. I read a few articles that suggested it was preferable to calculate when you can, but I would just like to know if that still applies to the following 2 examples. Example 1. Say you are storing data relating to a car. You store the fuel tank size in litres, and how many litres it uses per 100km. You also want to know how many KMs

问题 I want to call a function, with as parameters a string and an Int32 . The string is just a literal, the Int32 should be a field . So I thought it should be something like: .method public hidebysig instance string TestVoid() cil managed { .maxstack 1 .locals init ( [0] string CS$1$0000) L_0000: nop L_0001: ldstr "myString" L_0006: ldfld int32 FirstNamespace.FirstClass::ByteField L_000b: call string [Class1]Class1.TestClass::Functie<int32>(string, int32) L_0010: ret } But this throws the error

问题 How can I get the current element number when I'm traversing a array? I know about count(), but I was hoping there's a built-in function for getting the current field index too, without having to add a extra counter variable. like this: foreach($array as $key => value) if(index($key) == count($array) .... 回答1: You should use the key() function. key($array) should return the current key. If you need the position of the current key: array_search($key, array_keys($array)); 回答2: PHP arrays are

问题 I have this form in a view in my project. I need to pass the task_id to a certain controller, but the log does not seem to be receiving the parameters. I don't know what the problem is. <%= form_for :taskid, :url => {:action=>"index", :controller=>"statistics"}, :html => {:class => "nifty_form", :method => "GET"} do |f| %> <%f.hidden_field :task_id, :value => task.id%> <td><%= f.submit "اختر مهمة لاظهار احصائياتها منفرده"%></td> <% end %> 回答1: You are missing on = after <% . The equal sign is