Use the [`index`](http://golang.org/pkg/text/template/#Functions) command like so:

    {{index .Keys 3}}

As stated in the html/template package, the majority of examples are actually located in the text/template pkg docs. See http://golang.org/pkg/text/template/

From the docs

    index
        Returns the result of indexing its first argument by the
        following arguments. Thus &quot;index x 1 2 3&quot; is, in Go syntax,
        x[1][2][3]. Each indexed item must be a map, slice, or array.

I&#39;m following a rails prelaunch signup tutorial.  Bootstrap was working fine deployed on heroku, but then I modified the bootstrap_and_override file to include a logo.  When launching a rails server locally and viewing, the style is as I intended with bootstrap and the new header logo appearing.

Like I did before, I ran rake assets:precompile and pushed to git - followed this tutorial http://railsapps.github.com/rails-heroku-tutorial.html which worked before showing the css while on heroku.  The html is showing but it looks like css and bootstrap are missing.

Does anyone have any ideas?

CSS loading locally but not in Heroku for a rails app

I have a master repo on host1 and made an update to a repo on host2.  I `hg push`ed the changes from host2 to host1 with

    [mpenning@host2 login]$  hg push ssh://host1//opt/python/login

However, when I try to update or merge, I get

    [mpenning@host1 login]$ hg update
    abort: outstanding uncommitted merges
    [mpenning@host1 login]$ hg merge
    abort: outstanding uncommitted merges
    [mpenning@host1 login]$ 

I also tried a `hg pull` from host1, but that didn&#39;t work either...

    [mpenning@host1 login]$ hg pull ssh://host2//opt/python/login
    running ssh host2 &#39;hg -R /opt/python/login serve --stdio&#39;
    mpenning@host2&#39;s password:
    pulling from ssh://host2//opt/python/login
    searching for changes
    no changes found
    [mpenning@host1 login]$ hg merge
    abort: outstanding uncommitted merges
    [mpenning@host1 login]$

What do I need to do to update my master repo on host1 with the changes from host2?

&lt;hr&gt;

More information about the repo on host1...

    [mpenning@host1 login]$ hg parents
    changeset:   27:6d530d533997
    user:        Mike Pennington &lt;d.pennington@foo.local&gt;
    date:        Wed Sep 26 11:44:51 2012 -0500
    files:       mp_getconf.py
    description:
    fix issue where config retrieval was broken
    
    
    changeset:   29:eaf3b5aacfe6
    user:        Mike Pennington &lt;d.pennington@foo.local&gt;
    date:        Wed Sep 26 11:43:15 2012 -0500
    files:       mp_getconf.py
    description:
    fix artifact of using the script to run generic commands, but this broke config retrieval
    
    
    [mpenning@host1 login]$

Mercurial / hg - abort: outstanding uncommitted merges

I have a slice: `Keys []* datastore.Key`

How could I index one of them in the template file? I guessed `{{.Keys[3] }}`, but that doesn&#39;t work and I searched a lot but with no clue.

Any suggestions would be welcome, thanks.

How to index a slice element?

I have a slice: <code>Keys []* datastore.Key</code>
How could I index one of them in the template file? I guessed <code>{{.Keys[3] }}</code>, but that doesn't work and I searched a lot but with no clue.
Any suggestions would be welcome, thanks.

If I have a map `m` is there a better way of getting a slice of the values `v` than this?


    package main
    import (
      &quot;fmt&quot;
    )

    func main() {
        m := make(map[int]string)

        m[1] = &quot;a&quot;
        m[2] = &quot;b&quot;
        m[3] = &quot;c&quot;
        m[4] = &quot;d&quot;

        // Can this be done better?
        v := make([]string, len(m), len(m))
        idx := 0
        for  _, value := range m {
           v[idx] = value
           idx++
        }

        fmt.Println(v)
     }

Is there a built-in feature of a `map`? Is there a function in a Go package, or is this the only way to do this?

In Go how to get a slice of values from a map?

Given the scenario where you have a function which accepts `t interface{}`. If it is determined that the `t` is a slice, how do I `range` over that slice?

	func main() {
		data := []string{&quot;one&quot;,&quot;two&quot;,&quot;three&quot;}
		test(data)
		moredata := []int{1,2,3}
		test(data)
	}

	func test(t interface{}) {
		switch reflect.TypeOf(t).Kind() {
		case reflect.Slice:
			// how do I iterate here?
			for _,value := range t {
				fmt.Println(value)
			}
		}
	}

Go Playground Example: http://play.golang.org/p/DNldAlNShB

range over interface{} which stores a slice

I am trying to print the last part of a string before a certain character.  

I&#39;m not quite sure whether to use the string .split() method or string slicing or maybe something else.    

Here is some code that doesn&#39;t work but I think shows the logic:  

    x = &#39;http://test.com/lalala-134&#39;
    print x[&#39;-&#39;:0] # beginning at the end of the string, return everything before &#39;-&#39;

Note that the number at the end will vary in size so I can&#39;t set an exact count from the end of the string.  

 


how to get the last part of a string before a certain character?

I&#39;m trying to combine the slice `[1, 2]` and the slice `[3, 4]`. How can I do this in Go?

I tried:

    append([]int{1,2}, []int{3,4})

but got:

    cannot use []int literal (type []int) as type int in append

However, [the documentation](http://golang.org/pkg/builtin/#append) seems to indicate this is possible, what am I missing?

    slice = append(slice, anotherSlice...)


Concatenate two slices in Go

What is the appropriate way to clear a slice in Go?

Here&#39;s what I&#39;ve found in the [go forums][1]:

    // test.go
    package main
    
    import (
    	&quot;fmt&quot;
    )
    
    func main() {
    	letters := []string{&quot;a&quot;, &quot;b&quot;, &quot;c&quot;, &quot;d&quot;}
    	fmt.Println(cap(letters))
    	fmt.Println(len(letters))
        // clear the slice
    	letters = letters[:0]
    	fmt.Println(cap(letters))
    	fmt.Println(len(letters))
    }


Is this correct?

To clarify, the buffer is cleared so it can be reused.

An example is [Buffer.Truncate][2] function in the bytes package.

Notice that Reset just calls Truncate(0). So it appears that in this case line 70 would evaluate:
    b.buf = b.buf[0 : 0]

http://golang.org/src/pkg/bytes/buffer.go

    // Truncate discards all but the first n unread bytes from the buffer.
    60	// It panics if n is negative or greater than the length of the buffer.
    61	func (b *Buffer) Truncate(n int) {
    62		b.lastRead = opInvalid
    63		switch {
    64		case n &lt; 0 || n &gt; b.Len():
    65			panic(&quot;bytes.Buffer: truncation out of range&quot;)
    66		case n == 0:
    67			// Reuse buffer space.
    68			b.off = 0
    69		}
    70		b.buf = b.buf[0 : b.off+n]
    71	}
    72	
    73	// Reset resets the buffer so it has no content.
    74	// b.Reset() is the same as b.Truncate(0).
    75	func (b *Buffer) Reset() { b.Truncate(0) }

  [1]: https://groups.google.com/forum/?fromgroups#!topic/golang-nuts/qlUKjMIS9sM
  [2]: http://golang.org/pkg/bytes/#Buffer.Truncate

How do you clear a slice in Go?

When inside a `with` or `range`, the scope of `.` is changed. How do you access the calling scope?

In a template how do you access an outer scope while inside of a &quot;with&quot; or &quot;range&quot; scope?

I have this struct :

    const (
    	paragraph_hypothesis = 1&lt;&lt;iota
    	paragraph_attachment = 1&lt;&lt;iota
    	paragraph_menu       = 1&lt;&lt;iota
    )
    
    type Paragraph struct {
    	Type int // paragraph_hypothesis or paragraph_attachment or paragraph_menu
    }

I want to display my paragraphs in a `Type` dependent way.

The only solution I found was based on dedicated functions like `isAttachment` testing the `Type` in Go and nested `{{if}}` :


    {{range .Paragraphs}}
        {{if .IsAttachment}}
        	-- attachement presentation code  --
        {{else}}{{if .IsMenu}}
        	-- menu --
        {{else}}
        	-- default code --
        {{end}}{{end}}
    {{end}}

In fact I have more types, which makes it even weirder, cluttering both the Go code with `IsSomething` functions and the template with those `{{end}}`.

What&#39;s the clean solution ? Is there some `switch` or `if/elseif/else` solution in go templates ? Or a completely different way to handle these cases ?


Switch or if/elseif/else inside golang HTML templates

I’m using AngularJS as the front-end JS library, with Go templates within Revel framework to to generate the markup on the back-end.

But both Go and Angular use `{{` and `}}` for delimiters in their templates. How can I escape them in Go to pass them to AngularJS?

How do I escape “{{” and “}}” delimiters in Go templates?

I am trying to display a list gym classes (Yoga, Pilates etc). For each class type there are several classes, so I want to group all the Yoga classes, and all the Pilates classes and so on.

I made this function to take a slice and make a map of it

    func groupClasses(classes []entities.Class) map[string][]entities.Class {
    	classMap := make(map[string][]entities.Class)
    	for _, class := range classes {
    		classMap[class.ClassType.Name] = append(classMap[class.ClassType.Name], class)
    	}
    	return classMap
    }

The problem is now how can I iterate through it, according to http://golang.org/pkg/text/template/, you need to access it in `.Key` format, I don&#39;t know the keys (unless I also passed a slice of keys into the template). How do I unpack this map in my view.

All I have currently is 

    {{ . }} 

which displays something like:

    map[Pilates:[{102 PILATES ~/mobifit/video/ocen.mpg 169 40 2014-05-03 23:12:12 +0000 UTC 2014-05-03 23:12:12 +0000 UTC 1899-12-30 00:00:00 +0000 UTC {PILATES Pilates 1 2014-01-22 21:46:16 +0000 UTC} {1 leebrooks0@gmail.com password SUPERADMIN Lee Brooks {Male true} {1990-07-11 00:00:00 +0000 UTC true} {1.85 true} {88 true} 2014-01-22 21:46:16 +0000 UTC {0001-01-01 00:00:00 +0000 UTC false} {0001-01-01 00:00:00 +0000 UTC false} {0001-01-01 00:00:00 +0000 UTC false}} [{1 Mat 2014-01-22 21:46:16 +0000 UTC}]} {70 PILATES ~/mobifit/video/ocen.mpg 119 66 2014-03-31 15:12:12 +0000 UTC 2014-03-31 15:12:12 +0000 UTC 1899-12-30 00:00:00 +0000 UTC 

Iterating through map in template

How can I look up the value of a map by using a variable key without iterating? 

So one can lookup a constant key on variable map $x with `$x.key1`, but is it possible to do `amap.$key`?
 

Content Type	Original Author	Original Content on Stackoverflow
Question	DeanSinaean	View Question on Stackoverflow
Solution 1 - Slice	nemo	View Answer on Stackoverflow
Solution 2 - Slice	dskinner	View Answer on Stackoverflow

How to index a slice element?

Slice Problem Overview

Slice Solutions

Solution 1 - Slice

Solution 2 - Slice

Mercurial / hg - abort: outstanding uncommitted merges

CSS loading locally but not in Heroku for a rails app

Attributions