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Partial templates

When a {{>name}} Mustache tag occurs in a template, GRMustache renders in place the content of another template, the partial, identified by its name.

You can write recursive partials. Just avoid infinite loops in your context objects.

Source of partials

Depending on the method which has been used to create the original template, partials will be searched in different places :

  • In the main bundle, with ".mustache" extension:
    • renderObject:fromString:error:
    • templateFromString:error:
  • In the specified bundle, with ".mustache" extension:
    • renderObject:fromResource:bundle:error:
    • templateFromResource:bundle:error:
  • In the specified bundle, with the provided extension:
    • renderObject:fromResource:withExtension:bundle:error:
    • templateFromResource:withExtension:bundle:error:
  • Relatively to the URL of the including template, with the same extension:
    • renderObject:fromContentsOfURL:error:
    • templateFromContentsOfURL:error:
  • Relatively to the path of the including template, with the same extension:
    • renderObject:fromContentsOfFile:error:
    • templateFromContentsOfFile:error:

Check Guides/template_repositories.md for more partial loading strategies.

Partials in the file system

When you identify a template through a URL or a file path (see templates.md), you are able to navigate through a hierarchy of directories and partial files.

The partial tag {{>name}} interprets the name as a relative path, and loads the partial template relatively to the embedding template. For example, given the following hierarchy:

- templates
    - a.mustache
    - partials
        - b.mustache

The a.mustache template can embed b.mustache with the {{> partials/b }} tag, and b.mustache can embed a.mustache with the {{> ../a }} tag.

Never use file extensions in your partial tags. {{> partials/b.mustache }} would have you get an error of domain GRMustacheErrorDomain and code GRMustacheErrorCodeTemplateNotFound.

Absolute paths to partials

When your templates are stored in a hierarchy of directories, you sometimes need to refer to a partial template in an absolute way, that does not depend on the location of the embedding template.

Compare:

`{{> partials/header }}`
`{{> /partials/header }}`   {{! with a leading slash }}

The first partial tag provides a relative path, and refers to a different template, depending on the path of the including template.

The latter always references the same partial, with an absolute path.

Absolute partial paths need a root, and the objects that set this root are GRMustacheTemplateRepository objects. The rest of the story is documented at template_repositories.md.

Template Hierarchy in an NSBundle

Bundles provide a flat, non-hierarchical, resource storage. Hence this hierarchy of partials is not available to templates stored as bundle resources.

However, You can embed a full directory and its contents as a bundle resource, and fall back to URL-based of file path-based APIs:

// URL of the templates directory resource
NSString *templatesPath = [[NSBundle mainBundle] pathForResource:@"templates" ofType:nil];

// Render a.mustache
NSString *aPath = [templatesPath stringByAppendingPathComponent:@"a.mustache"];
GRMustacheTemplate *aTemplate = [GRMustacheTemplate templateFromContentsOfFile:aPath error:NULL];
[aTemplate render...];

// Render b.mustache
NSString *bPath = [templatesPath stringByAppendingPathComponent:@"partials/b.mustache"];
GRMustacheTemplate *bTemplate = [GRMustacheTemplate templateFromContentsOfFile:bPath error:NULL];
[bTemplate render...];

You may also use the GRMustacheTemplateRepository class, that is documented in template_repositories.md:

// Repository of templates stored in templates directory resource:
NSString *templatesPath = [[NSBundle mainBundle] pathForResource:@"templates" ofType:nil];
GRMustacheTemplateRepository *repository = [GRMustacheTemplateRepository templateRepositoryWithDirectory:templatesPath];

// Render a.mustache
GRMustacheTemplate *aTemplate = [repository templateForName:@"a" error:NULL];
[aTemplate render...];

// Render b.mustache
GRMustacheTemplate *bTemplate = [repository templateForName:@"partials/b" error:NULL];
[bTemplate render...];

Overriding portions of partials

Partials may contain overridable sections. Those sections start with a dollar instead of a pound. For example, let's consider the following partial:

page_layout.mustache
<html>
<head>
    <title>{{$page_title}}Default title{{/page_title}}</title>
</head>
<body>
    <h1>{{$page_title}}Default title{{/page_title}}</h1>
    {{$page_content}
        Default content
    {{/page_content}}}
</body>
</html>

You can embed such an overridable partial, and override its sections with the {{<partial}}...{{/partial}} syntax:

article_page.mustache
{{<page_layout}}

    {{! override page_title }}
    {{$page_title}}{{article.title}}{{/page_title}}

    {{! override page_content }}
    {{$page_content}}
        {{$article}}
            {{body}}
            by {{author}}
        {{/article}}
    {{/page_content}}

{{/page_layout}}

When you render article.mustache, you will get a full HTML page.

You can override a section with attached data, as well:

anonymous_article.mustache
{{<article_page}}
    {{$article}}
        {{body}}
        by anonymous coward
    {{/article}}
{{/article_page}}

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