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273 lines
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HTML
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273 lines
8.6 KiB
HTML
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<a class="current" href="./">How it works</a>
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<li class="toctree-l2"><a href="#overview">Overview</a></li>
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<li class="toctree-l2"><a href="#validating">Validating</a></li>
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<li class="toctree-l2"><a href="#executing">Executing</a></li>
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<li class="toctree-l2"><a href="#errors-explained">Errors explained</a></li>
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<h1 id="overview">Overview</h1>
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<p>Following reading describes implementation details of query execution process. It may clarify some
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internals of GraphQL runtime but is not required to use it.</p>
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<h1 id="parsing">Parsing</h1>
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<p>TODOC</p>
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<h1 id="validating">Validating</h1>
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<p>TODOC</p>
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<h1 id="executing">Executing</h1>
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<p>TODOC</p>
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<h1 id="errors-explained">Errors explained</h1>
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<p>There are 3 types of errors in GraphQL:</p>
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<ul>
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<li><strong>Syntax</strong>: query has invalid syntax and could not be parsed;</li>
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<li><strong>Validation</strong>: query is incompatible with type system (e.g. unknown field is requested);</li>
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<li><strong>Execution</strong>: occurs when some field resolver throws (or returns unexpected value).</li>
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</ul>
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<p>Obviously, when <strong>Syntax</strong> or <strong>Validation</strong> error is detected - the process is interrupted and
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the query is not executed.</p>
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<p>Execution process never throws exceptions. Instead, all errors are caught and collected in
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execution result.</p>
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<p>GraphQL is forgiving to <strong>Execution</strong> errors which occur in resolvers of nullable fields.
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If such field throws or returns unexpected value the value of the field in response will be simply
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replaced with <strong>null</strong> and error entry will be registered.</p>
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<p>If an exception is thrown in the non-null field - error bubbles up to the first nullable field.
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This nullable field is replaced with <strong>null</strong> and error entry is added to the result.
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If all fields up to the root are non-null - <strong>data</strong> entry will be removed from the result<br />
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and only <strong>errors</strong> key will be presented.</p>
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