1072 lines
27 KiB
HTML
1072 lines
27 KiB
HTML
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<link rel="prev" href="../05_philosophy/">
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<title>Best Practices - Hexa Documentation</title>
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<body dir="ltr" data-md-color-scheme="slate" data-md-color-primary="blue-grey" data-md-color-accent="teal">
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Skip to content
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<nav class="md-header__inner md-grid" aria-label="Header">
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<a href=".." title="Hexa Documentation" class="md-header__button md-logo" aria-label="Hexa Documentation" data-md-component="logo">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M10.25 2c.19 0 .36.11.44.26l2.22 3.96.09.28-.09.28-2.22 3.96c-.08.15-.25.26-.44.26h-4.5c-.19 0-.36-.11-.44-.26L3.09 6.78 3 6.5l.09-.28 2.22-3.96c.08-.15.25-.26.44-.26zm0 11c.19 0 .36.11.44.26l2.22 3.96.09.28-.09.28-2.22 3.96c-.08.15-.25.26-.44.26h-4.5c-.19 0-.36-.11-.44-.26l-2.22-3.96L3 17.5l.09-.28 2.22-3.96c.08-.15.25-.26.44-.26zm9.25-5.5c.19 0 .36.11.44.26l2.22 3.96.09.28-.09.28-2.22 3.96c-.08.15-.25.26-.44.26H15c-.19 0-.36-.11-.44-.26l-2.22-3.96-.09-.28.09-.28 2.22-3.96c.08-.15.25-.26.44-.26z"/></svg>
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<label class="md-header__button md-icon" for="__drawer">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg>
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<div class="md-header__title" data-md-component="header-title">
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<div class="md-header__ellipsis">
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<div class="md-header__topic">
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<span class="md-ellipsis">
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Hexa Documentation
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</div>
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<div class="md-header__topic" data-md-component="header-topic">
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<span class="md-ellipsis">
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Best Practices
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</span>
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</div>
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</div>
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<label class="md-header__button md-icon" for="__search">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg>
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<div class="md-search" data-md-component="search" role="dialog">
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<label class="md-search__overlay" for="__search"></label>
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<div class="md-search__inner" role="search">
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<form class="md-search__form" name="search">
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<input type="text" class="md-search__input" name="query" aria-label="Search" placeholder="Search" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="search-query" required>
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<label class="md-search__icon md-icon" for="__search">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg>
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11z"/></svg>
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<nav class="md-search__options" aria-label="Search">
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<a href="javascript:void(0)" class="md-search__icon md-icon" title="Share" aria-label="Share" data-clipboard data-clipboard-text="" data-md-component="search-share" tabindex="-1">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M18 16.08c-.76 0-1.44.3-1.96.77L8.91 12.7c.05-.23.09-.46.09-.7s-.04-.47-.09-.7l7.05-4.11c.54.5 1.25.81 2.04.81a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3c0 .24.04.47.09.7L8.04 9.81C7.5 9.31 6.79 9 6 9a3 3 0 0 0-3 3 3 3 0 0 0 3 3c.79 0 1.5-.31 2.04-.81l7.12 4.15c-.05.21-.08.43-.08.66 0 1.61 1.31 2.91 2.92 2.91s2.92-1.3 2.92-2.91A2.92 2.92 0 0 0 18 16.08"/></svg>
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</a>
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<button type="reset" class="md-search__icon md-icon" title="Clear" aria-label="Clear" tabindex="-1">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M19 6.41 17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z"/></svg>
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</nav>
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<div class="md-search__suggest" data-md-component="search-suggest"></div>
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</form>
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<div class="md-search__output">
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<div class="md-search__scrollwrap" tabindex="0" data-md-scrollfix>
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<div class="md-search-result" data-md-component="search-result">
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<div class="md-search-result__meta">
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Initializing search
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</div>
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<ol class="md-search-result__list" role="presentation"></ol>
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</div>
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</div>
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</div>
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</div>
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</div>
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</nav>
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</header>
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<div class="md-container" data-md-component="container">
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<nav class="md-tabs" aria-label="Tabs" data-md-component="tabs">
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<div class="md-grid">
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<ul class="md-tabs__list">
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<li class="md-tabs__item">
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<a href=".." class="md-tabs__link">
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Home
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</a>
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<li class="md-tabs__item">
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<a href="../01_overview/" class="md-tabs__link">
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Overview
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../02_components/" class="md-tabs__link">
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Core Components
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../03_use_cases/01_yaml_first/" class="md-tabs__link">
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Use Cases
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../04_design/" class="md-tabs__link">
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Design
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../05_philosophy/" class="md-tabs__link">
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Philosophy
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</a>
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</li>
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<li class="md-tabs__item md-tabs__item--active">
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<a href="./" class="md-tabs__link">
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Best Practices
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../07_error_handling/" class="md-tabs__link">
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Error Handling
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../08_testing_example/" class="md-tabs__link">
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Testing
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||
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</a>
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</li>
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</ul>
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</div>
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</nav>
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<main class="md-main" data-md-component="main">
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<div class="md-main__inner md-grid">
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<div class="md-sidebar md-sidebar--primary" data-md-component="sidebar" data-md-type="navigation" >
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<div class="md-sidebar__scrollwrap">
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<div class="md-sidebar__inner">
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<nav class="md-nav md-nav--primary md-nav--lifted md-nav--integrated" aria-label="Navigation" data-md-level="0">
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<label class="md-nav__title" for="__drawer">
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<a href=".." title="Hexa Documentation" class="md-nav__button md-logo" aria-label="Hexa Documentation" data-md-component="logo">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M10.25 2c.19 0 .36.11.44.26l2.22 3.96.09.28-.09.28-2.22 3.96c-.08.15-.25.26-.44.26h-4.5c-.19 0-.36-.11-.44-.26L3.09 6.78 3 6.5l.09-.28 2.22-3.96c.08-.15.25-.26.44-.26zm0 11c.19 0 .36.11.44.26l2.22 3.96.09.28-.09.28-2.22 3.96c-.08.15-.25.26-.44.26h-4.5c-.19 0-.36-.11-.44-.26l-2.22-3.96L3 17.5l.09-.28 2.22-3.96c.08-.15.25-.26.44-.26zm9.25-5.5c.19 0 .36.11.44.26l2.22 3.96.09.28-.09.28-2.22 3.96c-.08.15-.25.26-.44.26H15c-.19 0-.36-.11-.44-.26l-2.22-3.96-.09-.28.09-.28 2.22-3.96c.08-.15.25-.26.44-.26z"/></svg>
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</a>
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Hexa Documentation
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href=".." class="md-nav__link">
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<span class="md-ellipsis">
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Home
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../01_overview/" class="md-nav__link">
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<span class="md-ellipsis">
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Overview
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../02_components/" class="md-nav__link">
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<span class="md-ellipsis">
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Core Components
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||
</span>
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||
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||
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</a>
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</li>
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<li class="md-nav__item md-nav__item--nested">
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||
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<input class="md-nav__toggle md-toggle md-toggle--indeterminate" type="checkbox" id="__nav_4" >
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||
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<label class="md-nav__link" for="__nav_4" id="__nav_4_label" tabindex="0">
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||
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||
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<span class="md-ellipsis">
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||
Use Cases
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||
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||
</span>
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
</label>
|
||
|
||
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_4_label" aria-expanded="false">
|
||
<label class="md-nav__title" for="__nav_4">
|
||
<span class="md-nav__icon md-icon"></span>
|
||
Use Cases
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||
</label>
|
||
<ul class="md-nav__list" data-md-scrollfix>
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||
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<li class="md-nav__item md-nav__item--nested">
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||
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|
||
<input class="md-nav__toggle md-toggle md-toggle--indeterminate" type="checkbox" id="__nav_4_1" >
|
||
|
||
|
||
<label class="md-nav__link" for="__nav_4_1" id="__nav_4_1_label" tabindex="0">
|
||
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Contract Authoring
|
||
|
||
</span>
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
</label>
|
||
|
||
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_4_1_label" aria-expanded="false">
|
||
<label class="md-nav__title" for="__nav_4_1">
|
||
<span class="md-nav__icon md-icon"></span>
|
||
Contract Authoring
|
||
</label>
|
||
<ul class="md-nav__list" data-md-scrollfix>
|
||
|
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<li class="md-nav__item">
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||
<a href="../03_use_cases/01_yaml_first/" class="md-nav__link">
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<span class="md-ellipsis">
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YAML First
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||
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../03_use_cases/02_abc_first/" class="md-nav__link">
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<span class="md-ellipsis">
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ABC First
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||
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</span>
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</a>
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</li>
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</ul>
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</nav>
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</li>
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👣 Only Redeclare What You Change
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📄 Representational Fidelity
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🧩 Wiring Discipline
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🧪 Test Layout
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<h1 id="best-practices">Best Practices<a class="headerlink" href="#best-practices" title="Permanent link">¶</a></h1>
|
||
<p>Rules of thumb for structuring hexa pipelines that stay easy to extend and verify. Grounded in the extraction pipeline sample and the test suite.</p>
|
||
<hr />
|
||
<h2 id="layer-discipline">🌳 Layer Discipline<a class="headerlink" href="#layer-discipline" title="Permanent link">¶</a></h2>
|
||
<ul>
|
||
<li><strong>Never subclass an ABC for a bank.</strong> Bank classes always subclass the concrete <code>Impl*</code> classes. The ABC defines the contract once; <code>Impl*</code> carries behavior; banks only vary.</li>
|
||
<li><strong>Pin concrete types at <code>Impl*</code></strong>, not at the ABC. The ABC declares <em>shape</em> (<code>number: NumberPort</code>); <code>Impl*</code> decides <em>implementation</em> (<code>number: ImplNumberPort</code>).</li>
|
||
<li><strong>Keep the root thin.</strong> A bank root is one annotated subclass:
|
||
<div class="language-python highlight"><span class="filename">Python</span><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="k">class</span><span class="w"> </span><span class="nc">AxisExtractionPipeline</span><span class="p">(</span><span class="n">ImplExtractionPipeline</span><span class="p">):</span>
|
||
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a> <span class="n">txn_dicts</span><span class="p">:</span> <span class="n">AxisTxnDictsPort</span>
|
||
</code></pre></div></li>
|
||
</ul>
|
||
<hr />
|
||
<h2 id="only-redeclare-what-you-change">👣 Only Redeclare What You Change<a class="headerlink" href="#only-redeclare-what-you-change" title="Permanent link">¶</a></h2>
|
||
<p>The redundancy rule: if a slot's behavior is already correct from <code>Impl*</code>, <strong>leave it out</strong>.</p>
|
||
<ul>
|
||
<li><code>date</code> is not redeclared on <code>AxisTransactionParserPort</code> — it inherits <code>ImplDatePort</code>.</li>
|
||
<li><code>ambiguity</code> is not redeclared on <code>AxisAmountBalancePort</code> — it inherits <code>ImplAmbiguityPort</code>.</li>
|
||
<li>Re-declaring slots you don't change adds mental load on the extender with zero behavior change — and keeps the diff between a bank and <code>Impl*</code> minimal.</li>
|
||
</ul>
|
||
<p>If you do redeclare a slot, <strong>re-pin it back to your own bank's port</strong> (e.g. <code>amount_balance.number: AxisNumberPort</code>) so a single bank's number formatting is consistent down the subtree.</p>
|
||
<hr />
|
||
<h2 id="representational-fidelity">📄 Representational Fidelity<a class="headerlink" href="#representational-fidelity" title="Permanent link">¶</a></h2>
|
||
<p>Keep YAML and ABC in agreement:</p>
|
||
<ul>
|
||
<li>Every converter (<code>parse_yaml</code>, <code>generate_abc</code>, <code>parse_abc</code>, <code>generate_yaml</code>) serializes through the same <code>PortNode</code> tree — any tree fits, nothing is tied to a particular sample.</li>
|
||
<li>Use <code>check_matches(spec.yaml, abc.py)</code> (or <code>hexa check ...</code>) as a CI guard whenever both representations are maintained.</li>
|
||
<li>Class-level attributes on ABCs are used as <strong>documentation of the config surface</strong>; pin defaults at the <code>Impl*</code> level so the ABC stays a pure contract.</li>
|
||
<li>Nested grouped values are expressed once per representation: a <code>@dataclass</code> annotation (ABC) ⇄ a nested struct mapping (YAML).</li>
|
||
</ul>
|
||
<hr />
|
||
<h2 id="wiring-discipline">🧩 Wiring Discipline<a class="headerlink" href="#wiring-discipline" title="Permanent link">¶</a></h2>
|
||
<ul>
|
||
<li>Put plain runtime objects that must not be re-created (repos, handlers, clients) in <code>instances=</code> — wired verbatim by name, never reconstructed.</li>
|
||
<li>Put plain config values in <code>config=</code> — propagated <strong>by name</strong> across the whole tree, including nested ports.</li>
|
||
<li>Name a slot whatever the annotated field is called; <code>build</code> matches <code>instances</code>/<code>config</code> by that annotated name, so names must agree across the tree.</li>
|
||
<li>Keep port slot annotations to concrete <code>Impl*</code>/bank classes (or ABCs when the leaf is a config-only option). Builtin/<code>typing</code>/union-annotated fields are treated as config, not ports — so don't annotate a port with <code># type: str</code>.</li>
|
||
</ul>
|
||
<hr />
|
||
<h2 id="test-layout">🧪 Test Layout<a class="headerlink" href="#test-layout" title="Permanent link">¶</a></h2>
|
||
<p>Mirror <code>tests/</code>:</p>
|
||
<ul>
|
||
<li>One test module per component (<code>test_parse_yaml.py</code>, <code>test_parse_abc.py</code>, <code>test_generate_abc.py</code>, ...).</li>
|
||
<li>A dedicated <code>test_container.py</code> for <code>build</code> behavior (injection semantics, config propagation, defaults).</li>
|
||
<li>Use <code>samples/minimal</code> as the smallest contrived base fixture: one root, one nested port, a few config vars, a single abstract method. It bikes the whole YAML ⇄ ABC ⇄ runtime loop in a few lines.</li>
|
||
<li>Test the round-trip property directly — parsed models from both representations must be equal (<code>node1.diff(node3) == []</code>) and regeneration must be idempotent.</li>
|
||
</ul>
|
||
<hr />
|
||
<h2 id="related">Related<a class="headerlink" href="#related" title="Permanent link">¶</a></h2>
|
||
<ul>
|
||
<li><a href="../03_use_cases/03_wiring_runtime/">03 – Wiring & runtime</a> · <a href="../07_error_handling/">07 – Error Handling</a> · <a href="../08_testing_example/">08 – Testing</a></li>
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