[英]Setting datajoint key to a different variable in make fxn
Wondering why and when it's needed to set the key to a different variable in a make/maketuples function in an auto-populated table in datajoint, as in the documentation here .想知道为什么以及何时需要在 datajoint 的自动填充表中将密钥设置为 make/maketuples function 中的不同变量,如此处的文档中所示。
In this example, the part table SegmentationROI is defined as follows:在本例中,零件表 SegmentationROI 定义如下:
%{
# Region of interest resulting from segmentation
-> test.Segmentation
roi : smallint # roi number
---
roi_pixels : longblob # indices of pixels
roi_weights : longblob # weights of pixels
%}
classdef SegmentationROI < dj.Part
properties(SetAccess=protected)
master = test.Segmentation
end
methods
function make(self, key)
image = fetch1(test.Image & key, 'image');
[roi_pixels, roi_weighs] = mylib.segment(image);
for roi=1:length(roi_pixels)
entity = key;
entity.roi_pixels = roi_pixels{roi};
entity.roi_weights = roi_weights{roi};
self.insert(entity)
end
end
end
end
What is the purpose of renaming the key as a separate variable, entity (entity = key), and then inserting that?将键重命名为单独的变量实体(实体 = 键)然后插入它的目的是什么?
In this case, we're adding fields to entity
as a struct.在这种情况下,我们将字段作为结构添加到
entity
。 I'd consider it best practice to preserve arguments a function as-is.我认为最好的做法是按原样保留 arguments 和 function。 If we added a second for-loop here, we might run into issues when calling
key
for another purpose.如果我们在这里添加第二个 for 循环,我们可能会在为其他目的调用
key
时遇到问题。
Caveat: I'm more familiar with DataJoint python and have not used it extensively in MATLAB.警告:我更熟悉 DataJoint python 并且没有在 MATLAB 中广泛使用它。
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