sql - Activerecord how to get all unique belongs_to attributes in a set? -

-

मेरे पास एक मॉडेल पोस्ट और मॉडेल श्रेणियाँ के साथ एक रेल आवेदन है।

श्रेणी belongs_to पोस्ट

मैं प्रति पृष्ठ 20 पदों को प्रदर्शित करने के लिए पृष्ठ पर अंक लगाना का उपयोग कर रहा हूं, और प्रत्येक पृष्ठ पर मुझे श्रेणियों द्वारा फ़िल्टर करने के लिए एक फिल्टर है।

अब तक, मैं इस पर आधारित श्रेणियों की सूची मुद्रित करता हूं पदों का पूरा सेट, उप-समुच्चय नहीं, जो कि पृष्ठांकित पेज का गठन करता है।

इसलिए जब मैंने अपनी क्रिया में पहले किया था: 

  home do @posts = Posts.paginate (पृष्ठ: पैराम्स [: पृष्ठ], प्रति पृष्ठ: 20) @ श्रेणी = श्रेणी.ऑल respond_to do format | Format.html एंड एंड

मैं श्रेणियों को कैसे वर्गीकृत कर सकता हूं जैसे कि इसमें श्रेणियों के संपूर्ण डाटाबेस की बजाय @ पोस्ट से सभी अनूठी श्रेणियों की सूची है।

कृपया वर्ग के रूप में प्रयास करें। Joins (: posts) .paginate (पेज: params [: page], per_page : 20) .युनीक ।


Comments

Post a Comment

Popular posts from this blog

java - Can't add JTree to JPanel of a JInternalFrame -

-
Image
There are two panels in my JInternalframe. I want to add TopPanel to Jtree to nominate another. But I can not add Jaitari to the top of the panel. Please help me in this piece of code: DefaultMutableTreeNode root = new DefaultMutableTreeNode ("deck"); DefaultMutableTreeNode Item Clubs = New DefaultMutableTreeNode ("Club"); AddAllCard (itemClubs); Root.add (itemClubs); DefaultMutableTreeNode item = New DefaultMutableTreeNode ("Diamonds"); AddAllCard (itemDiamonds); Root.add (itemDiamonds); DefaultMutableTreeNode Itemspads = New DefaultMutableTreeNode ("Spades"); AddAllCard (itemSpades); Root.add (itemSpades); DefaultMutableTreeNode item increases = new DefaultMutableTreeNode ("heart"); AddAllCard (itemHearts); Root.add (itemHearts); Default Trimodel Tree Model = New DefaultTreeModel (Route); Tree = new jetty (tree modal); ScrollPane = new JScrollPane (tree); // scrollPane.setViewportView (tree); . ScrollPane.getViewport () add (tr...
Read more

asp.net mvc - How to attach sql database to a javascript graph -

-
I am creating a website using asp mvc5 and I need to show some data on a view using the graph I have implemented a graph using javascript. & lt; Head & gt; & Lt; Script src = "../../ js / jquery-1.11.1.min.js" & gt; & Lt; / Script & gt; & Lt; Script src = "../../JS/chart.cript.js" & gt; & Lt; / Script & gt; @ * & Lt; Link rel = "stylesheet" href = "../../ css / last stylesheet css" & gt; * @ & Lt; / Head & gt; & Lt; Body & gt; & Lt; Div class = "col-md-12" & gt; & Lt; Div class = "panel-panel-default" & gt; & Lt; Div class = "panel-title" & gt; Daily booking & lt; / Div & gt; @ * & Lt; Div class = "panel-body" & gt; * @ @ * & Lt; Div class = "col-lg-2" & gt; & Lt; / Div & gt; & Lt; Div class = "col-lg-8" style = "background-color: # 4876FF;" & G...
Read more

c# - How to know the number of Threads created and limit the Tasks accordingly -

-
It is very clear that with task as async / await Instead of calling the asynchronous call threads , my question is: Is there a way to monitor threads while completing these tasks? This is because I can decide an optimal number of times for the thread that the thread does not eat too many CPU cycles at the same time (the CPU is intensive to handle the work). We take an example below (output is also mentioned) Although the program is completed in 5 seconds, but it has two threads (id = 1,4 ) if I increase the number of 6 instead of 2, then it creates 4 threads I know that this is the CLR thread OS thread (which is 4 in my machine Are), but I would like to know how they are mapped O (with actions) and use the same CPU. Is there any way to get it? Test code Fixed zero main (string [] args) {RunTasksWithDelays (). ); } Static async Task Run Task with Dislay () {Stopwatch S = Stopwatch. Startup (); Console.light line ("thread id =" + thread.content.trade.manag...
Read more