在下面的代码片段中,我在视图中进行了大量的数据库操作。 (.where,以及两个循环)。从视图中重构此代码的最佳方法是什么?
在视图中:index.html.erb
<%- @lesson.sections.each do |section| -%>
<%- section_correlations = section.correlations.where(:grade => 4) %>
<%- unless section_correlations.blank? -%>
<h3><%= section.full_title %></h3>
<%- section_correlations.each do |correlation| -%>
<%= correlation.description %>
<%- end -%>
<%- end -%>
<%- end -%>
答案 0 :(得分:1)
在Section模型文件中,您可以添加以下方法
def get_correlation_descriptions(grade)
correlations.where(:grade => grade).map { |c| c.description }
end
并在您的课程模型中:
def sections_with_correlation_names(grade)
section_data = []
sections.each do |s|
correlation_names = s.get_correlation_descriptions(grade)
unless correlation_names.blank?
section_data << { :name => s.full_title, :correlations => correlation_names }
end
end
section_data
end
然后在你看来:
<%- @lesson.sections_with_correlation_names(4).each do |section| -%>
<h3><%= section[:name] %></h3>
<%= section[:correlations].join("\n") %>
<%- end -%>