动态设置整个Prawn PDF文档的高度 [英] Set dynamically height for entire Prawn PDF Document

问题描述

在尝试使用大虾 gem生成文档时，我遇到了问题导轨

I'm stuck with a problem when trying to generate a document using Prawn gem for Rails

我想做的是为我的pdf设置一个可变的高度，因此，根据数据库中的某些查询，PDF的高度会改变.之所以这样做，是因为我需要一页PDF文档.

What I'm trying to do is to set a variable height for my pdf, so depending on some queries in the database, the PDF height will change. I'm doing this because I need a single page PDF document.

当前，我的代码如下:

pdf = Prawn::Document.new(page_size: [297.64, 419.53], margin: 0)

....

data = [ ["Header1", "Header2", "Header3", "Header4", "Header5", "Header6"] ]

// here is the variable data
cart.cart_products.each do |cp|
  arr = [
    cp.product_code,
    cp.product_description,
    cp.amount,
    cp.product_metric,
    cp.product_unit_value,
    cp.total_value
  ]

  data.push(arr)
end

// populating the table with data
pdf.table(data, :cell_style => {:border_width => 0}, :column_widths => [45, 80, 30, 42.36, 50, 50]) do |table|
  table.row(0).border_width = 0.1.mm
  table.row(0).font_style = :bold
  table.row(0).borders = [:bottom]
end

....

pdf.render_file("path/to/dir/document.pdf")

有人可以帮我吗?谢谢.

Can anyone help me with this? Thanks.

推荐答案

在不知道您到底要调整什么的情况下，我不得不在这里做出一些猜测.

Without knowing what exactly you're adjusting for, I'll have to makes some guesses here.

因此，我将为您返回的数据和最小文档高度确定某种行高.

So I would establish some sort of line height for your returned data and a min document height.

line_height = 14
min_height = 419.53

然后，我将运行查询并计算结果.然后，我将弄清楚可变高度是多少，并将其添加到最小高度.

Then I would run the queries and count the results. Then I would figure out what the variable height would be and add it to the min height.

variable_height = results.length * line_height
height = min_height + variable_height

最后:

pdf = Prawn::Document.new(page_size: [297.64, height], margin: 0)

类似的事情应该可以通过调整来满足您的特定需求.

Something like this should work with tweaks for your specific needs.

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