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